STMLStatistical Approaches to Analyzing Streamflow Timing Trends with High Inter-Annual Variability in the Western U.S.

Climate change-driven shifts in streamflow timing have been documented for Western North America and are expected to continue with increased warming. These changes will likely have the greatest implications on already short and overcommitted water supplies in the region. This study investigated changes in Western North American streamflow timing over the 1948 – 2008 period, including the very recent warm decade not previously considered, through a) trends in streamflow timing measures b) two second order linear models applied simultaneously over the region to test for the acceleration of these changes, and c) changes in runoff regimes. Basins were categorized by the percentage of snowmelt derived runoff to enable the comparison of groups of streams with similar runoff characteristics and to quantify shifts in snowmelt-dominated regimes.

Results indicate that streamflow has continued to shift to earlier in the water year, most notably for those basins with the largest snowmelt runoff component. However, an acceleration of these streamflow timing changes for the recent warm decades is not clearly indicated. Most coastal rain-dominated and some interior basins have experienced later timing. The timing changes are connected to area-wide warmer temperatures, especially in March and January, and precipitation shifts that bear sub-regional signatures. Notably, a set of the most vulnerable basins has experienced runoff regime changes, such that basins that were snowmelt dominated at the beginning of the observational period shifted to mostly rain dominated in later years. These most vulnerable regions for regime shifts are in the California Sierra Nevada, eastern Washington, Idaho, and north-eastern New Mexico. Snowmelt regime changes may indicate that the time available for adaptation of water supply systems to climatic changes in vulnerable regions are shorter than previously recognized.

Author: Holger Fritze

Supervisor: Edzer Pebesma

Co-supervisor: Iris Stewart-Frey

SWSLA Web of Things integrated Sensor Platform for Precision Agriculture

Abstract: This thesis introduces the AgriSenseBox, a Web of Things integrated Sensor Platform for Precision Agriculture. Based upon open hardware, the AgriSenseBox provides a web server containing a RESTful interface. The sensor platform is deployable in the field and makes sensor data processable without caring of differing formats. The AgriSenseBox is encoding its measurements as JSON using the structure proposed by O&M and hands out links to descriptions of the attached sensors. Following the principles of the WoT, sensor data is browseable by using web standards, such as HTTP and URI

Author: Dustin Demuth

Supervisor: Arne Bröring

Co-supervisor: Albert Remke

MUSILDesigning a Sensor Metadata Editor

Sensors monitor our environment for a variety of purposes such as tracking natural forces, forecasting the weather or supporting military operations. The value of a sensor data application depends on the number and density of integrated sensing devices as well as on their fitness for the application's purpose. The latter is determined by several factors. A flow forecast application, for instance, might integrate high quality sensors that measure water levels and are located in a certain area on the globe.

Sensor selection requires meaningful and machine-readable descriptions of sensor attributes, such as observed properties, unit of measure, calibration, deployment time, accuracy, and observation area. Although the OGC standard SensorML is well adapted to encode sensor metadata, editing tools that support the creation process of such detailed sensor metadata documents are missing.

The BSc thesis should design and implement a sensor metadata editor that eases creation of SensorML 2.0 documents. These documents should

  1. be semantically annotated with keywords from well-known ontologies, such as weather phenomenon expressions or unit of measure terms.
  2. follow the StarFL profile for terrestrial sensing devices.



Christian Malewski (

Werner Kuhn (

Author: -

Supervisor: -

SITCOMGebäudeinformations- und -navigationssystem für den GEO-Neubau

Für den GEO-Neubau soll ein interaktives Gebäudeinformations- und -navigationssystem für den Foyerbereich erstellt werden.  Dieses soll Besucher ermöglichen, schnell die Personen oder Institute zu finden, die sie besuchen möchten. Dies kann im Rahmen einer Bachelorarbeit (evtl. auch einer Masterarbeit) geschehen, bei der ein Prototyp (z.B. web-basiert) erstellt wird und anschließend mit Benutzern (vor Ort) evaluiert wird. Eine Einbindung von mobilen Geräten (also den Smartphones von Besuchern) ist eine ebenfalls untersuchenswerte Option.

Interessenten wenden sich bitte an Christian Kray

Author: Markus Konkol

Supervisor: Chris Kray

SITCOMGestenbasierte Interaktion mit Videoumgebungen

Videobasierte Visualisierungsumgebungen zeigen großes Potenzial für die Geovisualisierung. Gestensteuerung eignet sich für die intuitive Interaktion mit solchen Umgebungen. Inhalt dieser Arbeit ist der Vergleich zweier existierender Gestensteuerungsansätze.

Author: Johanna Möllmann

Supervisor: Christian Kray

SITCOMLichtblick - Optische Kommunikation mit einem Großbildschirm

Großbildschirme und öffentliche Bildschirme finden sich immer häufiger in unserer Umgebung. Zumeist dienen sie nur zur Informationsvermittlung, aber manche Systeme lassen auch Nutzerinteraktion zu. Diese Arbeit zielt auf die Implementierung und Evaluation eines neuen Verfahrens zur Interaktion mit großen Bildschirmen ab. Dabei soll ein Mobiltelefon mit eingebauter Kamera sowie eine am Bilschirm befestigte Kamera genutzt werden, um eine rein optische Kommunikation zwischen Bildschirm und Mobilgerät herzustellen (z.B. via QR-Codes und OpenCV/OpenFrameworks). Grundlegende Kenntnisse in der Programmierung einer mobilen Plattform (Android, iOS, etc.) sind Vorraussetzung zur Durchführung dieser Arbeit. 

Author: Sven Heitmann

Supervisor: Chris Kray

Co-supervisor: Morin Ostkamp

SILEffects of scale and mode of transportation on use of landmarks in wayfinding instructions

In contrast with wayfinding instructions given by machine routing services (e.g. Google Maps, MapQuest, etc.), humans give wayfinding instructions in a different format.  Human instructions, however, consist of landmarks at different levels and orientation information. Studies have shown that the use of local landmarks and global landmarks have different patterns across different scales and modes of transportation, when wayfinding instructions are given verbally. In this proposed study, the researcher will be investigating the exclusive roles of scale and mode of transportation on use of both local and global landmarks.

Author: Leon Vogel

Supervisor: Rui Li

Enhancing OpenSeaMap with Live Observation Data

The OpenSeaMap project ( is based on the OpenStreetMap technology and aims at providing sea maps. It offers a very broad range of nautical charts and information about features such as beacons, buoys and other navigation aids.

Complementary to static information (e.g. locations of buoys and navigation aids), there is also a need for providing dynamic information such as weather data and water level measurements. Currently a first implementation for integrating dynamic observation data is in place. However, the existing implementation is not based on open standards so that the integration of new data sources is a rather cumbersome task.

Within this thesis, a student shall develop an approach, how the integration of dynamic observation data into the OpenSeaMap platform can be achieved. For this purpose relevant technologies (e.g. OGC Sensor Web Enablement) need to be evaluated. Based on the evaluation results and potentially identified gaps, an according concept shall be developed. In a final step the resulting concept shall be implemented and evaluated.

Author: Axel Virnich

Supervisor: Simon Jirka

STMLMap matching of GPS trajectories

Map matching is the matching of GPS trajectories to existing road segments. Several algorithms have been proposed and evaluated for this. This thesis will create and document an open source implementation of one of the more successful of these algorithms.

On the bachelor level, a simple implementation in a new or existing R package is required. On the Master level, a comparison of different modelling approaches and implementation forms is additionally required.

Requirement: experience with R and R programming.

Resulting package:

Author: Nikolai Gorte

Supervisor: Edzer Pebesma

SILEffects of local landmarks regarding their locations on route in wayfinding instructions

Landmarks are commonly used in human daily communication of wayfinding instructions. Research has suggested the potential of increasing efficiency by using landmarks in wayfinding instructions. Further studies investigated the use of landmarks in wayfinding instructions in terms of their location: Global, local at decision point, and local along a route. While the locations of landmarks have been introduced, their specific effects are not clear yet. This study aims to test wayfinding instructions with landmarks at specific locations: landmarks at decision point or landmarks along route. This study includes two major objectives as follows:

  1. Constructing wayfinding instructions with landmarks at specific locations in visual or verbal forms;
  2. Testing the effect of each type of instructions on aspects of wayfinding such as orientation, accuracy, and configuration.

This research contributes to a more comprehensive study on landmarks with respect to their locations on route

Author: Jens Balmert

Supervisor: Rui Li

SILIntegrating global and local landmarks in mobile navigation services

Providing navigation support is not only guiding a wayfinder to reach one or multiple destinations. More importantly, it should support the wayfinder’s spatial orientation to facilitate the wayfinder’s awareness of the environment. Research has suggested approaches to enhance a person’s spatial orientation while using mobile navigation systems. Building on the previous work of visualizing global landmarks on mobile systems, this research further contribute to this development through the following two objectives:

  1. Selecting and visualizing local landmarks that would combine with the use of visualized global landmarks on mobile screen;
  2. Integrating the visualized global and local landmarks in instructions.

The outcome of this research is a prototype of mobile navigation service that uses global and local landmarks in both visual and verbal instructions.

Author: Marius Runde

Supervisor: Rui Li

SITCOMSTRIDE für Public Display Systeme -- Eine Fallstudie

Das Ziel ist es, die Tauglichkeit des STRIDE-Threat-Modells für Public Display Systeme anhand einer oder mehrerer Fallstudien zu untersuchen. Mögliche Untersuchungsobjekte sind u.a. das ifgi-Foyer-System, Bankautomaten, Fahrkarten- automaten oder interaktive Bildschirme in Kaufhäusern (z.B. Terminals an denen CDs zur Probe gehört werden können.). Lassen sich "alle" Gefahren für die Privatsphäre der Benutzer (Privacy Threats) durch die Kategorien im STRIDE-Modell beschreiben oder oder gibt es "überflüssige" STRIDE-Kategorien? Wie kann das STRIDE-Modell genutzt werden um Gefahren bzw. Risiken gezielt zu adressieren?

Author: MO

Supervisor: Morin Ostkamp

SITCOMUmsetzung einer Sprachsteuerung für ein IVE

Das Ziel ist es, Befehle zur Steuerung eines Immersive-Video- Environments (IVE) per Spracheingabe zu realiseren. So sollen z.B. Befehle wie "Nach links", "Nach rechts", "Gerade aus" oder "Ich öffne die Tür" in entsprechende Aktionen innerhalb der simulierten Umgebung umgesetzt werden. Dazu sollen APIs und Services wie zum Beispiel Wit.AI genutzt werden. Welche Befehle lassen sich damit realiseren, u.a. hinsichtlich ihrer Länge (z.B. "Ich folge der Straße rechts von mir" vs. "nach rechts") und ihrer Komplexität (z.B. "Ich gehe nach rechts. Dann öffne ich die Tür." vs. "Nachdem ich rechts abgebogen bin, öffne ich die Tür.")? Welche technischen Geräte (z.B. Mikrofon- Arrays) sind mit welchen Eigenschaften (z.B. Abstand zum Sprecher) nötig?

Author: Nicholas Schiestel

Supervisor: Morin Ostkamp

Co-supervisor: Chris Kray

SITCOMEntwicklung eines kartenbasierten Content-Management-Systems

Das Ziel ist die Entwicklung und Evaluation ein kartenbasierten Content-Management-System (CMS) für das iPED Toolkit [1]. Dieses CMS soll dazu genutzt werden, Objekte in einer graph- basierten Datenbank zu verwalten. Diese Objekte entsprechen realen Orten, die auf einer Karte verortet werden sollen. Zu jedem Ort sollen zusätzliche Daten (z.B. Fotos oder Videos) abgespeichert werden können. Zur Umsetzung des CMS sollen moderne Technologien wie HTML5, CSS3, AJAX und Responsive Design zum Einsatz kommen. Zur Evaluation der Umsetzung soll in einer kleinen Studie die Task-Completion-Time bzw. Error-Rate der Benutzer ermittelt werden.

[1] Ostkamp, M., Kray, C. Supporting Design, Prototyping, and Evaluation of Public Display Systems. Proc. EICS ’14, ACM (2014), to appear.

Author: Nico Steffens

Supervisor: C. Kray

Co-supervisor: M. Pfeiffer

SILRäumliche Wissensakquise mit Route Aware Maps: Eine Benutzerstudie zu Unterschieden in der räumlichen Wissensakquise bei der Navigation mit Route Aware Maps und Navigationssystemen

Es gibt verschiedene Möglichkeiten Menschen mit Karten zu Navigieren. Die meisten unterstützen entweder die bestmögliche Routenführung oder das Aneignen von räumlichen Umgebungsinformationen (Münzer, Zimmer, & Baus, 2012).

In der vorliegenden Bachelorarbeit wurde auf Basis der wissenschaftlichen Arbeit von Schmid, Richter, & Peters (2010) eine neuartige Möglichkeit der Navigation, die Route Aware Map, im Hinblick auf die Vermittlung von räumlichen Wissen untersucht. In dieser wird durch Berechnung des Weges und Anzeigen der Karte in der Vogelperspektive mit relevanten Umgebungsinformationen versucht, zum einen eine gute Routenführung zu ermöglichen und gleichzeitig die räumliche Wissensakquise zu fördern.

Author: Clara Rendel

Supervisor: Angela Schwering

Co-supervisor: Vanessa Joy Anacta

SILSpace Syntax in Navigation (Bachelor / Master / External Semester)

People are often get lost inside buildings. One reason for this circumstance is the situation if space is perceivable, but not reachable. This situation is known as the visibility accessibility problem. This setting could happen if elements like
glass walls or voids surrounded by balustrades were present. Space Syntax is a theoretical framework that allows to investigate relations between space and human. Two buildings of the University of Munster (Germany) were analysed with Space Syntax. Convex and axial maps and their properties were used. The aim of that kind of analysis was to investigate if Space Syntax methods can help us to analyse indoor navigation in case of visible, but not reachable spaces. Both buildings were split in two diff erent spatial layouts, one considering visibility and one in regard to accessibility. Therefore, it was able to see if the visibility accessibility problem aff ects a building or not. This work leads to the conclusion that Space Syntax can be helpful for analysing indoor navigation if space is observable, but not accessible. This work concentrated on two dimensions. The next step would be to extend it to the third dimension.

Author: Bartosz Mazurkiewicz

Supervisor: Jakub Krukar

SITCOMGoPro 360°

Systematic and structured panoramic imagery are well known by Google Streetview. However do-it-yourself applications capturing own material are still rare, despite the existence of small factor, high quality cameras and the availability the 3D printers.
This thesis will make use of both, available GoPros and 3D printer. The aim of this thesis is to develop a capturing apparatus for panorama images and videos and a middleware for processing the raw material. A set of potential deployments, which may may include bikes, pedestrian, and uavs, and an integration into the SitCom IVE  will be explored.
Further information can be found here:

Author: Matthias Mohr

Supervisor: Holger Fritze

Co-supervisor: Christian Kray

PDF: thesis147.pdf

SITCOMAnalyse von Benutzeroberflächen gängiger GIS Software

GIS Software kann häufig sehr komplex sein. Dafür gibt es verschiedene Gründe wie zum Beispiel die Vielzahl der Funktionen, die ein solches System bereit stellt. Dem Benutzer Zugang zu diesen Funktionen zu ermöglichen stellt ein große Herausforderung im Hinblick auf das Design der Benutzerschnittstelle dar.  Das Ziel dieser Arbeit ist, anhand existierender GIS Software wie ArcGIS oder PostGIS den aktuellen Stand bzgl. Funktionsumfang von GIS sowie dessen Realisierung auf der Benutzerschnittstellenebene zu erfassen und zu analysieren.

Author: Laura Meierkort

Supervisor: Christian Kray

Co-supervisor: Thomas Bartoscheck

SITCOMVergleich von automatisierten und manuellen Eingabemethoden bei mobilen Crowdsourcing-Verfahren

Der Crowdsourcing-Ansatz hat in der jüngsten Vergangenheit stark an Bedeutung gewonnen und wird immer häufi ger zur Informationsbescha ffung angewendet. Die vorliegende Bachelorarbeit vergleicht automatische sowie manuelle Eingabemethoden bei mobilem Crowdsourcing. Primär soll herausgefunden werden, welche Methode von den Nutzern bevorzugt verwendet wird und welche Gründe diese Präaferenzen haben können. Weiterhin wird der Einfluss einer Erinnerungsfunktion für Eingaben per Hand untersucht.

Um diese Fragestellungen zu beantworten wurde eine Kombination aus zwei Fragebögen und einer Nutzerstudie angewendet. Für die Nutzerstudie wurde eine Android-App zur Lärmmessung implementiert und über zwei Wochen von einer Gruppe von 16 Personen getestet.

Die Ergebnisse der Studie zeigen, dass eine automatisierte Eingabemethode der manuellen tendenziell vorgezogen wird. Weiterhin wurde festgestellt, dass die Nutzung einer Erinnerungsfunktion die Anzahl der Eingaben auf Kosten eines erhöhten Störfaktors mit sich bringen kann.

Author: Dennis Wilhelm

Supervisor: Prof. Dr. Christian Kray

Co-supervisor: Dr. Arne Bröring

PDF: 20120805_ba_dennis_wilhelm211.pdf

STMLImplementation of a Fuzzy Logic Based Map Matching Algorithm in R

The Global Positioning System (GPS) is widely used and is a major positioning technology for land vehicle navigation. However it is not 100% accurate, which is a problem for any kind of navigation system. There are several factors that contribute to positioning errors, e.g., satellite related errors, propagation related errors, receiver related errors, GPS signal masking or blockage and satellite geometric contribution to position error (Quddus, 2006). This is where map matching comes in.

Map matching is the process of matching GPS trajectories to a digital road network. This is done by map matching algorithms. In Quddus (2006) several of the existing map matching algorithms are discussed and three improved map matching algorithms are introduced. One of the more successful algorithms is the fuzzy logic map matching algorithm, whose implementation is the main part of the bachelor thesis.

The above mentioned map matching algorithm is implemented in R (R Core Team, 2013) and therefore it is open source. The testing of the algorithm is done using _eld data acquired from the enviroCar1 project.

The result of this bachelor thesis is a documentation and an R package providing functions which allow the user to match their GPS trajectories to a digital road network using the fuzzy logic map matching algorithm and also allow the customization of the parameters used in the membership functions in the fuzzi_cation process.

Author: Nikolai Gorte

Supervisor: Prof. Dr. Edzer Pebesma

Co-supervisor: Dr. Christoph Stasch

PDF: bachelor_thesis_nikolai_gorte365.pdf

GeoSimSensitivity analysis of a land use change model

Land use change is the result of complex interactions between socio-economic and environmental processes. Land use change models are used to simulate potential pathways in a land use system, aiding decision makers to develop effective policies. Because these policies can have large environmental, economic and social impacts, it is important to clearly understand the working of land use change models.
Sensitivity analysis (SA) is a method to assess how the variation in the output of a model can be related to different sources of variation in the model structure, input data and parameter values. This is key information to, for example, prioritize additional data collection for one of the model inputs. While SA can be very straightforward and is recognized as a key step in environmental modelling, it is more often than not omitted in environmental model evaluation exercises (Shin et al., 2013). For land use change models, SA has almost never been applied.
The aim of this BSc thesis is to perform a sensitivity analysis for the land use change model PLUC, for a case study in Brazil or Mozambique (Verstegen et al., 2012). The code of the land use change model (in python) will be provided. Depending on the interests of the student, the analysis can have a further focus on comparing two different SA methods (see Shin et al., 2013 for an overview of methods), on the dependence of the sensitivities on selected parameter ranges, on sensitivities at different spatial scales, on visualization methods for sensitivities, or an own idea. 
Shin, Guillaume, Croke and Jakeman, 2013, Addressing ten questions about conceptual rainfall–runoff models with global sensitivity analyses in R. Journal of Hydrology 503, 135-152.
Verstegen, Karssenberg, Van der Hilst and Faaij, 2012, Spatio-temporal uncertainty in Spatial Decision Support Systems: A case study of changing land availability for bioenergy crops in Mozambique. Computers, Environment and Urban Systems 36, 30-42.

Author: Max Höltgen

Supervisor: Judith Verstegen

PDF: BA_Sensitivitatsanalyse_eines_LUCs_von_Max_Holtgen_Unterschrieben546.pdf

GeoSimHow can a Jupyter based notebook for spatial temporal modelling improve literate computing?

A few years ago, all computer practicals at the university were taught at university-owned desktop computers. Nowadays, many students prefer to work on their own laptops. The installation of all required software and packages, and the setting of environment variables can be cumbersome.

In this project, you will test a solution for this problem by developing web tutorials in which the programming exercises can implemented, run, and stored, without any installation on the part of the user. The idea is to implement Jupyter Notebooks ( with a server running JupyterHub. For an example on how Jupyter is used in education, see You can use existing IFGI course material for programming in R and/or PCRaster Python as test data. If successful, your solution will be implemented in the curriculum.

Author: Clemens Hackenberg

Supervisor: Judith Verstegen

Co-supervisor: Derek Karssenberg (Utrecht University)

ifgicopterVisuelle Darstellung vertikaler CIR-Videostreams von ökologisch relevanten vertikalen Strukturen mittels einer AR-Drone in einem Web-Portal

Diese Arbeit gab eine kurze Einführung über UAV und ihre Anwendungsmöglichkeiten. Besonderes Augenmerk wurde dabei auf den Bereich vertikaler Aufnahmen, speziell im colorinfraroten Bereich, gelegt. Mithilfe eines entwickelten Webtools wurde gezeigt, wie die Zeitkomponente der aufgenommenen Videos mit der aktuellen Flughöhe der Drohne verknüpft werden kann. Dadurch wird ein erster Schritt zur vertikalen Darstellung von Farbinfrarotfilmen durch Erstellung eines Höhenprofils dargelegt. 

Author: Milan Köster

Supervisor: Torsten Prinz

Co-supervisor: Thomas Bartoschek

SILImproving and testing the usability of a citizen science geo data portal: OpenSenseMap

Citizen science and crowdsourced data have been getting the attention of researchers and citizens alike in recent times. A successful citizen science platform that wants to engage its users in a long term participation needs to meet above average standards in usability and functionality for both power and novice users. In this thesis the citizen science platform OpenSenseMap, a generic platform for environmental sensor data, will be improved based on feedback that was gathered in its rst year of use and general principles of web design. A usability test will give indications on how well its users like to interact with it and what still needs to be done.

Author: Chirstoph Kisfeld

Supervisor: Angela Schwering

Co-supervisor: Thomas Bartoschek

ifgicopterOptimierungsmöglichkeiten eines webbasierten Geodatenmanagements im Kontext studentischer Projektarbeiten am Beispiel des Portals StudMap14

Die vorliegende Arbeit zeigt Optimierungsmöglichkeiten für ein webbasiertes Geodatenmanagement hinsichtlich Interoperabilität und Zusammenarbeit im Rahmen studentischer Projektarbeiten auf und setzt einige dieser Möglichkeiten am praktischen Beispiel der Applikation StudMap14 um. StudMap14 ist ein mit Web-Technologien wie JavaScript, PHP, Sencha Ext JS [1] und GeoExt [2] implementiertes Webportal, das ein Teil der Geodateninfrastruktur des Fachbereichs 14 Geowissenschaften der Universität Münster ist [3]. Zudem wird ein GeoServer [4] zur Bereitstellung von Layern des OGC-Standards Web Map Service (WMS) [5] und die Geospatial Data Abstraction Library (GDAL) [6] zur Geodatenverarbeitung verwendet. Es geht in dieser Arbeit nicht um die Neuentwicklung eines Systems, sondern um die Verbesserung und Erweiterung einer bestehenden und sich bereits in Verwendung befindlichen Software.

In Kapitel 2 (Anforderungsanalyse) wird zunächst analysiert, welche Anforderungen beziehungsweise Optimierungsmöglichkeiten bestehen und daraufhin festgelegt, welche von diesen umzusetzen sind. Kapitel 3 (Implementierung) beschreibt zuerst die verwendeten Technologien und geht anschließend auf technische Details der Implementierung der neuen Funktionen ein. Die Funktionsfähigkeit und die Benutzerfreundlichkeit dieser Funktionen wird im Rahmen einer Nutzerstudie in Kapitel 4 evaluiert. Eine Zusammenfassung dieser Arbeit und einen Ausblick auf mögliche zukünftige Erweiterungen bietet Kapitel 5. Dieses Einleitungskapitel stellt im Weiteren die Applikation StudMap14 vor und legt die genauere Motivation zur Erweiterung dieses Systems dar.

Author: Andreas Ohrem

Supervisor: Dr. Torsten Prinz

Co-supervisor: Christian Knoth

PDF: bachelorarbeit_andreas_ohrem175.pdf

STMLKraftstoffverbrauch beim EnviroCar-Projekt

43 Millionen Personenkraftwagen nehmen am Straßenverkehr in Deutschland teil, wovon 95% auf fossile Brennstoffe angewiesen sind [BMU 2010][KBA 2013]. Das starke Verkehrsaufkommen, vor allem in Städten, hat negative Folgen für die Umwelt und die Gesundheit der dort lebenden Menschen. So hatte im Jahr 2004 allein in Deutschland der Straßenverkehr einen Anteil von 20% am Gesamtvolumen der direkten CO2-Emissionen [BMU 2008]. Im Vergleich zum Jahr 2000 ist der Kraftfahrzeugbestand in Deutschland um 13,2% angestiegen. Während die Verkehrsinfrastruktur im überörtlichen Bereich bei Kreisstraßen und Autobahnen nur geringe Zunahmen, bei Bundesstraßen sogar Verluste erzielt [DeSTATIS 2012a][DeSTATIS 2012b]. Die Verluste bei Bundesstraßen und Zugewinne bei Kreisstraßen sind meist auf regionale Änderungen der Verkehrsinfrastruktur zurückzuführen. So können Bundesstraßen beispielsweise zu Kreisstraßen umstrukturiert werden [DBT 2013]. Innerorts sind größtenteils nur durch die Erschließung neuer Wohn- und Gewerbegebiete Zuwächse der Verkehrsinfrastruktur zu beobachten [ADAC 2008]. Eine zusätzliche Belastung für die Verkehrswege ist die steigende Fahrleistung der Personenkraftfahrzeuge. Diese betrug im Jahr 2011 schätzungsweise 610 Milliarden Kilometer [DIW 2012]. Dies belastet vor allem innerörtliche Verkehrswege, welche Aufgrund der umliegenden Bebauung nicht weiter ausgebaut werden können. Zunehmenden Einfluss erhalten daher Maßnahmen zur Veränderung des Verkehrsverhaltens, beispielsweise durch Einsatz von Umweltzonen oder Geschwindigkeitsbegrenzungen, um den Verkehrsfluss zu optimieren.

Um Prognosen und Verkehrsplanungen durchführen zu können, bedarf es einer zuverlässigen Erhebung von Informationen zum Straßenverkehr in Deutschland. Hierzu gibt das Bundesministerium für Verkehr, Bau und Stadtentwicklung das sogenannte deutsche Mobilitätspanel in Auftrag. Es finden seit 1994 jährlich und in dreijähriger Begleitung, Befragungen von knapp 2000 Personen zu ihrem Verkehrsverhalten statt. Unter anderem werden Informationen über die Länge der Wegstrecken sowie Kosten und Kraftstoffverbrauch, erhoben [DIW 2012]. Anhand dieser Erhebung kann nicht nur die Fahrleistung in Kilometern geschätzt werden, sondern auch der durchschnittliche und gesamte Kraftstoffverbrauch und die Schadstoffemission der Fahrzeuge. Der Gesamtverbrauch an Kraftstoff wird ebenfalls aus dem an den Tankstellen abgesetzten Volumen Kraftstoffe, sowie auf Grundlage von Verbrauchsangaben der Fahrzeughersteller und Automobilzeitschriften geschätzt [DIW 2004].

Gerade der Energie- und Kraftstoffverbrauch ist wichtig für die Berechnung der CO2-Emissionen und bilden eine weitere Informationsgrundlage zur Alltagsmobilität für die Stadt- und Verkehrsplanung. Die langfristigen Ziele in der Umweltpolitik sind daher, eine Senkung der CO2- und Schadstoffemissionen und einen geringeren Ressourcenverbrauch im Personenkraftverkehr zu erreichen. In vielen städtischen Bereichen werden daher Monitoringsysteme zur Überwachung der Luftqualität oder der Verkehrsstärke eingesetzt, um regelmäßig wichtige Umweltinformationen erfassen, die als Grundlage umweltpolitischer Entscheidungen dienen. An diesem Punkt setzt das EnviroCar-Projekt an.

Author: Julius Wittkopp

Supervisor: Prof. Dr. Edzer Pebesma

Co-supervisor: Dr. Albert Remke

PDF: Bachelorarbeit_Julius_Wittkopp362.pdf

STMLKleinräumige Bevölkerungsschätzung mit Hilfe der "EEA Fast Track Service Precursor on Land Monitoring" und "CORINE Land Cover" Datensätze

This bachelor thesis deals with an approach for the estimation of population in small areas. The approach was developed by Klaus Steinnocher (Steinnocher et al., 2006, Steinnocher et al., 2011) and relies on the assumption that the population density is proportional to the degree of soil sealing. Population data on the community level is disaggregated to a level of electoral districts for the whole region of Münster. The "EEA Fast Track Service Precursor on Land Monitoring" dataset represents the degree of soil sealing in 20x20m grid cells and is used as data basis for this approach. The CORINE Land Cover (CLC) dataset is used to mask those areas from the EEA dataset that are not used for residential purposes. For the same reason an OpenStreetMap dataset is used to mask the streets from the EEA dataset. The approach from Steinnocher is applied to the remaining areas which represent the living space as good as possible. The calculated population data is compared to the reference population data on a level of electoral districts. Differences and tendencies are discussed. Furthermore the realized approach from Steinnocher (Steinnocher et al., 2006, Steinnocher et al., 2011) is compared to another approach developed by Francisco Javier Gallego (Gallego et al., 2001, Gallego et al., 2010). Differences and characteristics of the two approaches are discussed.

Author: Lars Syfuß

Supervisor: Prof. Dr. Edzer Pebesma

Co-supervisor: Dipl. Geow. Dorothea Lemke

PDF: Bachelorarbeit_LarsSyfu557.pdf

ifgicopterPrototypische Entwicklung einer webbasierten GIS-Architektur zur Integration medizinischer Felddaten am Beispiel der Forschungsstudie am St. Michael’s Hospital Pramso, Ghana

Geographische Informationssysteme (GIS) bieten neue Möglichkeiten auch webbasierte Anwendungen zu entwickeln,welche die klassischenAufgaben reiner Desktop-GIS-Software auf das Internet adaptieren.

Im Rahmen dieser Bachelorarbeit soll eine prototypische GIS-Architektur entwickelt werden, welche die Integration von geographischen sowie empirisch erhobenen, medizinischen Felddaten ermöglicht. Als Fallstudie dient das Forschungsprojekt am St. Michael’s Hospital Pramso in Ghana, welches die regionale Ausbreitung der Malaria untersucht. Das implementierte System soll dabei drei Hauptbestandteile bereitstellen, welche den Wissenschaftler vor Ort unterstützen: Visualisierung und Speicherung von Kontext relevanten Daten, grundlegende Analysemöglichkeiten mit der Ausgabe von Informationsprodukten sowie eine GIS gestützte Aufnahme neuer Krankheitsfälle.

Author: Dominik Schlarmann

Supervisor: Dr. Torsten Prinz

Co-supervisor: Thomas Bartoschek

PDF: Bachelorarbeit_Schlarmann330.pdf

MUSILClustering von Aufnahmedaten digitaler Fotos zur Erkennung von Ereignissen für ein Bottom-Up Gazetteer

Fotoalben im Internet stellen eine beliebte Anwendung des Web 2.0 dar, bei der eine Vielzahl digitaler Fotos veröffentlicht wird. Zusätzlich zu den Bildern werden Metadaten wie Schlagwörter oder Freitextbeschreibungen gespeichert. Diese ermöglichen, Fotos zu kategorisieren und für textbasierte Suchmaschinen zu indizieren. Aus den Metadaten können ebenfalls Einträge für geographische Namenslexika gewonnen werden. In diesem Fall spricht man auch von sogenannten Bottom-Up Gazetteers (vgl. Keßler et al. 2009b). Zum Beispiel können die räumlichen Koordinaten aller Fotos mit der Bezeichnung „Münster“ zu einer Punktwolke zusammengefasst werden. Anschließend lassen sich daraus Aussagen über die geometrische Form und die geographi-sche Lage des Ortes ableiten.

Die vorliegende Arbeit betrachtet die zeitliche Dimension von Fotos. Es wird dabei untersucht, ob sich mithilfe der Aufnahmedaten die Dauer von Ereignissen ermitteln lässt. Hierbei werden Veranstaltungen (engl. Events) als eine bestimmte Ausprägung eines Ereignisses fokussiert. Deren Analyse erfolgt mit einem Clustering-Algorithmus, einer gängigen Klassifikationsmethode in der Geoinformatik. Das Verfahren wird anhand fünf ausgewählter Beispiele für Events und vergleichend mit drei Beispielen für Orte getestet.

Zur Visualisierung des Datenmaterials wurde eine graphische Benutzerschnittstelle in Form einer interaktiven Karte implementiert. Diese kann nun mit existierenden Gazetteers verbunden werden. Die Anwendung wurde speziell für Smartphones entwickelt, die sich in den letzten Jahren zunehmender Popularität erfreuen. Aufbauend auf den Ergebnissen der Analyse und der Implementierung werden mögliche Einsatzgebiete und Erweiterungen in Aussicht gestellt.

In dem ersten Kapitel werden zunächst alle für die weiteren Abschnitte notwendigen Grundlagen eingeführt.

Author: Raimund Schnürer

Supervisor: Prof. Dr. Werner Kuhn

Co-supervisor: Dr. Carsten Keßler

PDF: Bachelorarbeit_Schnrer443.pdf

STMLAnalysis and Visualization of Stream ow Timing Trends and Changes in Snowmelt Domination in Western North America

Snowmelt derived water is of great importance for most streams across Western North America. A changing climate affects streamflow and changes its intraannual contribution. Shifts of the center of timing (CT) and the start of snowmelt pulse towards earlier in the year have already been detected for the 1948-2000 period. While the trends for CT have increased for the 1948-2008 period, the ones for the snowmelt pulse did not appear to have accelerated. In contrast the number of snowmelt pulses decreased within the same period and indicated that more winter precipitation came as rain rather than snow. Based on the ratio of years with and without snowmelt pulses this study has developed a measure of snowmelt domination and classified the streams into four categories. These categories were used to compare groups of streams with similar runoff characteristics and to quantify shifts in snowmelt domination regimes. Furthermore the data and measures were interactively visualized on a virtual globe using Nasa World Wind Java.

Author: Holger Fritze

Supervisor: Prof. Dr. Edzer Pebesma

Co-supervisor: Prof. Iris Stewart-Frey

PDF: Bachelor-Thesis-Holger-Fritze680.pdf

Visualisierung von Community-basierten Lärmmessungen in einer Android-basierten Augmented Reality Umgebung

Umgebungslärm ist eine der umfassendsten Umweltbelastungen, da der Mensch ihr über seinem gesamten Tagesablauf hinweg ungeschützt ausgesetzt ist. Der Einfluss geht dabei über eine einfache Belästigung des Menschen hinaus und umfasst beispielsweise das Auslö-sen von Schlafstörungen, die Förderung kognitiver Beeinträchtigung sowie die Hervorbrin-gung von Herz-Kreislauf-Erkrankungen, weshalb Lärm inzwischen auch als entscheidende Krankheitsbelastung gewertet wird (vgl. World Health Organization 2011).

Mit dem Aufkommen des nutzerzentrierten „Web 2.0“ und mobiler Computer, sowie der Zukunft des ubiquitären Computings stehen gleichsam immer mehr Möglichkeiten zur Ver-fügung, diesen Umwelteinfluss direkt an seinem Immissionsort durch den Menschen einzu-schätzen und diese Daten anderen Nutzern zur Verfügung zu stellen.

Author: Holger Hopmann

Supervisor: Dr. Theodor Foerster

Co-supervisor: Prof. Dr. Christian Kray

PDF: BaHopmann358417802.pdf

SITCOMInteraktion mit virtuellen Globen mittels Armgesten: Implementierung und Evaluierung

The emergence of new hardware in the Veld of human-computer interaction has led to many possible applications for gesture control. One possible application for such a gesture control is a virtual globe as it is widely used and an easy way to display spatial data among other data. Also virtual globes are easy accessible. This bachelor thesis aims to combine a virtual globe with gesture control for spatial and temporal aspects. For this, a set of gestures were implemented. These gestures were tested at a science fair where an user study Mwas carried out. Furthermore the general approach of implementing the gestures are described. The results and Vndings of the user study will be discussed in this thesis.

Author: Gerald Pape

Supervisor: Prof. Dr. Christian Kray

Co-supervisor: Thomas Bartoschek

PDF: geraldpape_bsc_thesis215.pdf

SILThe Effects of Different Verbal Route Instructions on Spatial Orientation

Providing cognitively effective wayfinding instructions is an ongoing research objective. In addition to providing instructions that are efficient to reach a target location, research has also addressed developing instructions in a verbal format that could potentially facilitate spatial orientation and cognitive mapping. In this study, a type of verbal instructions is used that consists of not only essential information for a person to change the direction at decision points, but also additional orientation information along a route that is considered crucial for maintaining spatial orientation and getting an internal representation of the spatial layout. This type of verbal route descriptions is compared with machine-generated as well as skeletal descriptions for the same route. Thirty participants were randomly assigned to familiarize with one of three different types of wayfinding instructions, which described a specific route participants were unfamiliar with. Thus, they were intended to mentally walk along this route. The different types of instructions include: 1) machine-generated instructions, 2) orientationbased instructions, and 3) skeletal instructions. Results indicate that participants using the orientation instructions made least errors in their performance of spatial orientation. Results concerning their drawn sketch maps, however, revealed least accurate results in both landmark placement and route segment analysis among the three types of instructions. Regarding their good performance in orientation estimation, sketch map accuracy is suggested to be secondary concerning performance in spatial orientation and cognitive mapping. Additionally, using the orientation-based instructions type is not found beneficial regarding distance estimation accuracy. The machine-generated instructions with included distance information, however, are not found to lead to a good estimation of distance along the route. This study supports the validity of designing wayfinding instructions in the suggested way. It further implies the necessity to conduct a more comprehensive study on the effects of different types of instructions on various aspects of wayfinding behavior.

Author: Stefan Fuest

Supervisor: Dr. Rui Li

Co-supervisor: Vanessa Joy Anacta

PDF: StefanFuestbachelorthesis250.pdf

Räumliche Authentifikation an großflächigen multi-touch Oberflächen

Große multi-touch Benutzerschnittstellen ermöglichen die simultane Interaktion mehrerer Benutzer. Hierfür muss bei vielen multi-touch Anwendungen eine Eingabe einem bestimmten Benutzer zugewiesen werden. In dieser Arbeit wird eine Methode vorgestellt, mit der eine Person mit Hilfe eines üblichen Mobiltelefons für eine Subregion der multi-touch Oberfläche authentifiziert werden kann. Dies erfolgt über Farbsignale, die die Kamera des mobilen Gerätes erfasst. Zuerst wird durch Anzeige von Binärbäumen in Form von zweifarbigen Rechtecken die exakte Position der Kamera bestimmt, dann wird genau an dieser Position ein nur für die Kamera sichtbares Signal, bestehend aus einer Sequenz von unterschiedlichen Farben, übertragen. Wenn dieses korrekt aufgenommen wurde, ist der Benutzer an dieser Stelle authentifiziert.

Author: Klaus Drerup

Supervisor: Prof. Dr. Antonio Krüger

Co-supervisor: Prof. Dr. Edzer Pebesma

PDF: Klaus_Drerup_bachelor_thesis500.pdf

SITCOM3D Visualization of Changes in Running-Motion Caused by Interacting with Devices

We are currently investigating the effects of interaction with technology on running motion: By capturing 3D motion data in the form of trajectories in space over time, we are able to see how the runner's motion is affected by the interaction and how it compares to normal running.
But while it is possible to measure these changes, another issue is how to present these measurements in a way that is intuitive and easy to interpret. Effective use of visualization can address this problem and provide a better understanding of the measurements' meaning and support interaction design.
This thesis will thus approach different appropriate methods of visualization in 3D and evaluate them against criteria such as how useful they are for understanding changes in motion data. The goal is then to be able to implement a tool that would allow visual exploration, using the appropriate techniques, of differences in motion data caused by interaction with computer devices.
The scope will be defined according to the candidate’s planned degree.

Author: Simon Shoemaker

Supervisor: Edzer Pebesma

SILStop staring at that screen! Towards a 'calm' navigational system.

An increasing number of geographical searches is performed from mobile devices, out in the world. Many of them consider places located at relatively close proximity, within the spatial context of the searcher. In such situations, presenting the user with the entire map of his/her surrounding is rarely justified and presents an unjustified cognitive processing challenge. In addition, the sole action of looking at a map (not to mention its processing) can be considered superfluous e.g. when the aim of the user is merely to reach the nearest open pub as soon as possible. And yet, in mobile-based navigation, the only substantial progress in relation to desktop-based (or traditional paper-based) maps is the presence of a ‘You-Are-Here’ indicator and a turn-by-turn set of instructions. For all situations when the user does not need (or want) to learn the map of the environment, the currently available navigational systems demand too much attention - they force us to look at the screen and mentally process its content. This project will explore the possibility of developing a ‘calm’ navigational system. Using Weiser and Brown’s definition, ‘calm’ technology is one that allows the user to stay in control of the situation but does not demand constant attention. Students can explore the possibilities arising with wearable technologies (augmented reality glass, vibrating watch, audio-systems, etc.) to answer the question: How can a navigational system guide us from A to B without even being noticed by its user.


Bachelor students will develop a proof of concept / prototype.

Master students will develop a proof of concept and conduct user studies.


Quick Reading: only one great paper written in 1997(!) and still relevant today.

Weiser, M., & Brown, J. S. (1997). The coming age of calm technology. In Beyond calculation (pp. 75–85). Springer.

Author: Boris Stöcker

Supervisor: Jakub Krukar

SILApplying Principles of Knowledge Representation and Reasoning by Integrating Declarative Spatial Reasoning and Computer Vision: A Prototype System for Histopathology

Current Knowledge Representation and Reasoning (KR) systems are very capable at modelling our everyday world, but their ability to deal with spatial data in a qualitative manner is limited. By integrating existing ontologies and applying techniques from Declarative Spatial Reasoning and Computer Vision to example cases from histopathology, a possible approach on adding semantics to image data is presented. The prototype has the goal of supporting the identification of inconsistencies between image data and the underlying knowledge base, as well as hypothesising and inferring improvements of the image classification. The ability to create artificial instances from the knowledge base alone and to represent their geometries dynamically is pursued as well.

Author: Gereon Duesmann

Supervisor: Carl Schultz

Co-supervisor: Angela Schwering

PDF: bscthesis_g_dues01947.pdf

SILVisibility and Wayfinding

Our navigation is primarily driven by the visual sense. With some exceptions, our architectural and urban environment is designed with this principle in mind: money spent on placement of signs and billboards being an evidence of that. And yet, it is often the poorly thought-through visibility of some spatial elements that causes wayfinding difficulties. For instance, signs are well-visible only at a certain angle and approaching the sign is not equally probable at all angles. In multilevel buildings, visibility of staircases and the visibility of space after exiting staircases has been shown to have the key impact on users’ ability to orient themselves after changing the building level. Changing the direction of locomotion (turns and u-turns) are key events where designing what the user sees before and after, can make a difference between finding your way to the destination and becoming hopelessly lost.
For this thesis topic, the student will learn how to perform a Visibility Analysis of a building (WWU Psychology building or GEO1) or of an outdoor environment (Muenster Zoo) and use it to identify potential navigational challenges. The work will conclude with suggesting improvements in design and simulating their expected outcome.
Hölscher, C., Meilinger, T., Vrachliotis, G., Brösamle, M., & Knauff, M. (2006). Up the down staircase: Wayfinding strategies in multi-level buildings. Journal of Environmental Psychology, 26(4), 284–299.
Further reading:
Carlson, L., Holscher, C., Shipley, T. F., & Conroy Dalton, R. (2010). Getting Lost in Buildings. Current Directions in Psychological Science, 19(5), 284–289.
Xie, H., Filippidis, L., Gwynne, S., Galea, E. R., Blackshields, D., & Lawrence, P. J. (2007). Signage Legibility Distances as a Function of Observation Angle. Journal of Fire Protection Engineering, 17(1), 41–64.
Müller-Feldmeth, D., Schwarzkopf, S., Büchner, S. J., Hölscher, C., Kallert, G., Stülpnagel, R. von, & Konieczny, L. (2014). Location Dependent Fixation Analysis with Sight Vectors. Locomotion as a Challenge in Mobile Eye Tracking. In P. Kiefer, I. Giannopoulos, M. Raubal, & A. Krüger (Eds.), Proceedings of the 2nd International Workshop on Eye Tracking for Spatial Research co-located with the 8th International Conference on Geographic Information Science (GIScience 2014) (pp. 67–71). Vienna, Austria.

Author: Lasse Einfeldt

Supervisor: Jakub Krukar

Co-supervisor: Carl Schultz

SILGeostatistical methods for the openSenseMap-platform

The amount of citizen science initiatives and their corresponding data platforms is ever increasing. Within these citizen science platforms one “can identify a specific subtype of activities that can be termed ‘Geographical Citizen Science’[...]Geographical citizen science includes projects where the collection of location information is an integral part of the activity.” To visualize the spatiotemporal data of such initiatives WebMaps are being used (e. g.,, ).   


These platforms aim to give their users a quick way to upload and view their own and others data. To do further analysis and get more out of these citizen data, it is often needed to download the data. This process removes possible analysis results from such platforms and restrict citizen scientists to the role of a sensor. Simple tools to interpret this data are nearly always missing. The citizen scientists are though only used to “Crowdsource” the data (see “Levels of Citizen Scientists”).  


This thesis aims to add functionalities for geostatistical analysis to OpenSenseMap(OSeM) and in doing so, the platform could be used for basic interpretation. In a first step this thesis will focus on the addition of a time-slider to enable the view upon the temporal aspect of OSeM data so that interpolation methods can be applied. In a next step it will add different ways for web based interpolation methods. In particular it will focus upon opencpu as a way to use R for this task.


For future work or if time allows it, it could be researched if the addition of such an interpretation tool helps to increase the attractiveness of OSeM as a citizen scientists platform.


Author: Marc Dragunski

Supervisor: Prof. Dr. Edzer Pebesma

Co-supervisor: Thomas Bartoschek

SILUsability von Fahrplan-Informationssytemen im ÖPNV — Untersuchung am Beispiel von Applikationen des Hamburger Verkehrsverbundes

Ziel dieser Arbeit ist, am Beispiel von Hamburg mit einer Usability-Studie Probleme aufzudecken, die Nutzer auch mit bereits veröentlichten Anwendungen noch haben. Dabei werden die mobileWebseite und die Applikation untersucht und eventuelle Probleme in der Bedienung sowie markante Unterschiede zwischen beiden Anwendungen ermittelt, ohne dabei den Anspruch einer statistischen Auswertung zu haben.

Zunächst wird genauer auf die Thematiken der mobilen Fahrplananwendungen und dem Usability-Testing eingegangen und das Beispiel Hamburg kurz vorgestellt. Anschließend wird die Herangehensweise an einen Usability-Test geschildert und dessen Durchführung und Ergebnisse zusammengefasst. Abschließend wird ein kurzes Fazit aus den Ergebnissen des Tests gezogen. Das erste Kapitel erklärt die Usability und das Usability-Testing, führt in die Thematik mobiler Fahrplananwendungen bei Verkehrsbetrieben ein und stellt das hier untersuchte Beispiel des Hamburger Verkehrsverbundes vor. Im zweiten Kapitel werden die Erkenntnisse genutzt, um einen Usability-Tests zu entwickeln, durchzuführen und die Ergebnisse zu beschreiben. Abschließend gibt es noch eine Deutung dieser Ergebnisse.

Author: Anja Schlaphorst

Supervisor: Thomas Bartoschek

Co-supervisor: Torsten Prinz

SITCOMGeovisualization adaptations to support refugees in their resettlement process

Forced migrants (e.g. internally displaced people, refugees, asylum seekers) continuing arriving in cities all around the world. Forced migration is not a one-time phenomenon but a common and recurrent phenomenon in history. The recent European and African immigration crises are examples of this. As cities continue growing also does the information that is produced. The complexity of this information and the way of communicating it can present many challenges to newcomers, particularly, to those arriving in conditions of vulnerability as forced migrants (e.g. refugees and asylum seekers). This complexity can be addressed through different ways of visualizing information and interacting with it.


The Bachelor/Master student will work on one of the following two possible lines of research:


  1. “Geovisualization of existent curated data to support refugees in their resettlement process.”


The Starthilfe platform has been created for a group of civil volunteers with information relevant to forced migrants about several topics (mobility, education, jobs, health, among others). This information is currently mainly text-based, and it is just accessible through the web platform, meaning it can just be accessed while being online.

The text-based data has geospatial descriptions however it has not being geolocated and then geo-visualized. Some of the specifics tasks to address during this bachelor/master thesis are:


  • Retrieval of data from the Starthilfe website.

  • Creation of spatial datasets based on the retrieved data.

  • Geo-visualizing data and classifying it using the categories defined on the Starthilfe website (creation of layers, easy or common icons).

  • Test the geo-visualization adaptation with refugees and asylum seekers

Author: Sarah Lechler

Supervisor: Auriol Degbelo

Co-supervisor: Ana Maria Bustamante Duarte


SITCOMFootball Stadium Manager

Football games attract large numbers of visitors that need to perform various activities in games; this thesis could look into how to support those activities with dynamic situated signage, i.e. how to optimise evacuation in case of an emergency

Author: Norman Langer

Supervisor: Chris Kray

MUSILExploring spatial cause-effect relationships in cancer research

The goal of the work (jointly conducted with the ‘Institut für Epidemiologie und Sozialmedizin’ (IES) at the University of Münster) is to develop a spatial recommender system which assists in exploring cause-effect relationships of significant incidence elevations of selected cancer types in a predefined geographic region. The system should draw on Linked Data techniques to answer two types of queries:

  • Q1: given a significant elevation of the cancer risk (parameterized through the standardized incidence ratio) for a certain tumour and at a certain spatial unit (e.g. community level), what are possible (spatial) cancer causes and cancer risk factors?
  • Q2: given an elevated cancer cause/risk factor in a geographic region, what are types of cancer likely to occur?

The tasks of the student include both a modelling component and an implementation component. The modelling aspect involves:

  • The specification of a use case (together with the IES);
  • Identify useful taxonomies for cancer research as well as known causes and risk factors for selected cancer types in the monographies of the International Agency for Research on Cancer (IARC).

The implementation aspect includes:

  • The encoding of data from the use case using Linked Data techniques;
  • The development of a Web Interface.

The successful candidate is expected to write the Master’s thesis in the Summer Semester 2014. S/he should have epidemiological background knowledge about cancer etiologies or willingness to learn about them. Programming knowledge (HTML, CSS, PHP, Javascript) as well as knowledge of Semantic Web Technologies such as RDF, SPARQL is desirable but not mandatory.

Author: Friedrich Müller

Supervisor: Auriol Degbelo

MUSILCampus navigation and accessibility in LIFE

We are looking for a highly motivated Master’s student to develop an campus navigation tool for the University of Muenster. 

The aim of the thesis is to develop a tool (mobile/web) that will enable navigation through the buildings of the University of Muenster, based on a linked open data graph. One idea is to select a building of the university (e.g. the library) and create an indoor navigation graph that accommodates the navigation abilities of different people. The tool should automatically suggest possible navigation paths to a person, based on his or her navigation abilities encoded as Linked Open Data. It is developed within the ongoing LIFE (Linked Data for eScience Services) project at the Institute for Geoinformatics.   

The LIFE project publishes resources as Linked Open Data, addressing all kinds of resources ranging from raw data to articles and books through maps. The goal of the project is to improve interdisciplinary collaboration in science and education through the sharing of research data. LIFE is funded by the German Research Foundation, and is jointly carried out by the Muenster Semantic Interoperability Lab (MUSIL) at Institute for Geoinformatics ( and the University Library at University of Muenster.

The student is expected to start soon and finish the thesis in the SS 2014. Programming experience (desktop, mobile or web) is desirable. Familiarity with Semantic Web Technologies (RDF and SPARQL) is not mandatory. 

Interested? Please get in touch with us per e-mail at  or .

Author: Nemanja Kostic

Supervisor: Simon Scheider

SILExtraction and communication of sketched fire brigade site plans

During disaster emergencies such as fires, floods, landslides, etc., fire departments are usually one of the first responders in official capacity on site. On of the most important first and ongoing tasks that firemen have to perform is to evaluate the disaster scene to, among other things, establish the scope and spatial extent of the disaster and take stock of important landmarks in the vicinity. These landmarks include water sources and other spatial features such bridges or hospitals. Part of the aforementioned task involves creating a series of sketch maps of the surroundings of the disaster scene and annotating them accordingly. 
The challenge for this thesis is to determine the necessary data to be captured and to specify practical methods for capturing and communicating them. The firemen’s work involves a many different tasks and several sketches likely appear in the response to a single event. Moreover, for large scale events, several sketches may be drawn of different parts of the surroundings of the disaster scene. How can the critical information contained in these sketches be shared between firemen and with the operations control centers?
Status quo
  • Fire men sketch site plans of affected building complexes on prepared sheets
  • Symbols (tactical signs) are placed around the map with lines drawn from each symbol to each location of interestin the sketch  where the feature represented by the symbol is located.
Idea for thesis
  • capturing of handdrawn sketch (camera)
  • georeferencing of tactical sign
  • no full extraction of sketch required, but a rough georeferencing
  • assessment of existing sketched site plans
Intended for Master GI thesis
A version of this description with illustrations can be found at
Malumbo Chipofya (
Holger Fritze (


Author: Christian Kruse

Supervisor: Angela Schwering

Co-supervisor: Malumbo Chipofya / Holger Fritze

SILRepresenting orientation instructions with gestures.

When giving directions, we often use gestures to communicate changes in orientation. We rotate our bodies, wave our hands, and shift our heads. Seeing these gestures helps the person receiving the instruction to keep his/her orientation in the newly constructed mental map of the environment. They are intuitively given and intuitively understood. Many, even across distinct cultures. Navigational systems could potentially build on these gestures to represent changes in direction, or point to an important landmark lying along the route.


Bachelor students will run user studies to pick an interesting gesture potentially helpful during navigation. They will propose a modification to the existing navigational systems which utilises the gesture to support the navigation.


Master students will first run user studies to explore and classify the variety of relevant gestures used during direction-giving. Based on this classification, students will develop a concept of a navigational system which utilises some of those gestures.


Some reading:

Hirtle, Stephen C. "The use of maps, images and “gestures” for navigation." Spatial Cognition II. Springer Berlin Heidelberg, 2000. 31-40.

Author: Shankarlingam Sundaresan

Supervisor: Jakub Krukar

Co-supervisor: TBD

GeoSimCoupling of land-use change models GLOBIOM-Brazil and PLUC and comparison of their projections

During last decades Brazil has shown strong effort to decrease greenhouse gas
emissions (GHG) by decreasing deforestation in the Amazon. At the same time, the Brazilian government wants to reduce the country's dependence on fossil fuels, for that it strives to increase the share of renewable energy in its economy by using biofuels. The effect of such increase can be the risk of land-use change.
The aim of this thesis is to couple existing land use change models: global recursive dynamic partial equilibrium model GLOBIOM-Brazil, and demand-driven spatially-explicit model PLUC and compare the results of coupled model and GLOBIOM Brazil. We suggest that coupling these models can help to compare them. By coupling we mean inputs harmonization and using demand produced by GLOBIOM as input for PLUC. We argue that comparing these
models will provide for better understanding of possible reasons of differences between land-use patterns produced by both models. This comparison will also help us in analysing what can we learn from coupling global PE model with a higher resolution spatially explicit model and what can we gain from that. For model validation a time series of land use maps of Brazil, developed by the Brazilian Space Agency INPE, is used. We hope that model coupling and comparison will provide new information for development of land-use spatial allocation models, what will assist policy makers in making decisions regarding biofuel expansion in Brazil.
The research is carried out in cooperation with the Brazilian Space Agency (INPE). The master student will work together with a PhD student from INPE.

Author: Oleg Stepanov

Supervisor: Judith Verstegen

Co-supervisor: Gilberto Câmara

SITCOMDesigning Web Maps for future use

Thanks to open web mapping libraries (e.g., Leaflet, Mapbox), creating Web Maps has become easier. The purpose of this thesis is to explore some of the factors (i.e., design steps) which lead to an easier re-use of Web Maps once they have been created. In particular, the thesis should explore design steps which lead to:
    - Easy plugging of new spatial datasets to existing Web Maps
    - Easy plugging of new temporal datasets to existing Web Maps

The evaluation of the ideas is expected to take place with one or more re-use scenarios of open geodata for cities (e.g., re-use of Web Maps for referendum data).

Author: Saad Sarfraz

Supervisor: Auriol Degbelo

SITCOM3D Visualization of Changes in Running-Motion Caused by Interacting with Devices

We are currently investigating the effects of interaction with technology on running motion: By capturing 3D motion data in the form of trajectories in space over time, we are able to see how the runner's motion is affected by the interaction and how it compares to normal running.
But while it is possible to measure these changes, another issue is how to present these measurements in a way that is intuitive and easy to interpret. Effective use of visualization can address this problem and provide a better understanding of the measurements' meaning and support interaction design.
This thesis will thus approach different appropriate methods of visualization in 3D and evaluate them against criteria such as how useful they are for understanding changes in motion data. The goal is then to be able to implement a tool that would allow visual exploration, using the appropriate techniques, of differences in motion data caused by interaction with computer devices.
The scope will be defined according to the candidate’s planned degree.

Author: Simon Shoemaker

Supervisor: Edzer Pebesma

SIIIntegration of geospatial services into e-Government applications based on e-Government and SDI standards

This thesis analyses the technical means that are necessary to integrate geospatial data services into e-Government applications. To do so, experts from both, the geospatial domain and the e-Government domain were interviewed to find use-cases which emerge from this integration. The examination of these use-cases showed, that an integration is only possible when basic requirements addressing the secure, traceable, and legally binding transport of messages are met. In e-Government infrastructures standardised transport technologies like OSCI were developed to meet these requirements. In order to satisfy the identified requirements and to enable legally binding, secure and traceable information exchange between services of SDIs and e-Government applications, thiswork applies the techniques of the transport protocol OSCI to a geospatial data service. The developed prototypical application is on the one hand capable of providing the necessary security, on the other hand it preserves the standards which are used in SDIs. This work shows that an integration of geospatial services into standardised e-Government applications is feasible, when all requirements are met.

Author: Dustin Demuth

Supervisor: Prof. Dr. Albert Remke

Co-supervisor: Prof. Dr. Edzer Pebesma

PDF: Demuth_MScThesis999.pdf

SITCOMSupporting Public Deliberation Through Spatially Enhanced Dialogs

Public deliberation conducted by citizen initiatives is an important part of the democratic foundation of our society. Lists on Internet pages, meetings and newspaper advertisements are used as medium for informing the public. A more profound deliberation can be achieved through giving citizens the opportunity to actively participate. Although research of spatial discussion platforms exists, only few investigate the use of dialogs or even spatially enhanced dialogs. This thesis explores the support of public deliberation performed by citizen initiatives through spatially enhanced dialogs. In order to enable citizen initiatives to engage in dialogs, a prototypical spatial discussion platform was developed. Semi-structured and expert interviews, as well as a focus group, helped to evaluate how spatially enhanced dialogs support deliberation performed by citizen initiatives. In this context, the concept of spatially enhanced dialogs and the developed prototype were tested. The results show general understanding of the respondents for the concept. However, the conveyance of projects’ spatial characteristics appear to have a higher level of importance for evaluation participants.

Author: Gerald Pape

Supervisor: Prof. Dr. Christian Kray

Co-supervisor: Thore Fechner

PDF: geraldpape_msc_thesis978.pdf

MUSILMaking the Web of Data Available viaWeb Feature Services

Interoperability is the main challenge on the way to efficiently find and access spatial data on the web. Significant contributions regarding interoperability have been made by the Open Geospatial Consortium (OGC), where web service standards to publish and download spatial data have been established. The OGCs GeoSPARQL specification targets spatial data on the Web as Linked Open Data (LOD) by providing a comprehensive vocabulary for annotation and querying. While OGC web service standards are widely implemented in Geographic Information Systems (GIS) and offer a seamless service infrastructure, the LOD approach offers structured techniques to interlink and semantically describe spatial information. It is currently not possible to use LOD as a data source for OGC web services. In this paper we make a suggestion for technically linking OGC web services and LOD as a data source, and we explore and discuss its benefits. We describe and test an adapter that enables access to geographic LOD datasets from within OGC Web Feature Service (WFS), enabling most current GIS to access the Web of Data. We discuss performance tests by comparing the proposed adapter to a reference WFS implementation.

Author: Jim Jones

Supervisor: Prof. Dr. Werner Kuhn

Co-supervisor: Dr. Carsten Keßler

PDF: JimJonesMasterarbeit634.pdf

Sensor Discovery in Virtual Globes

Virtual globes are an effective tool for visualisation and exploration. This thesis investigates whether a virtual globe is suited for the discovery of environmental sensors. Different kinds of sensor representations are discussed and - taking the increasing number of mobile sensors into account - also how to visualise sensor movements. Cartographic generalisation algorithms are applied to reduce the sensor density on the globe. Spatial, thematic and temporal filters narrow down the sensor search.

The concepts are implemented in a web-based virtual globe application. The application shall help citizen scientists finding sensors of other providers to calibrate their own sensors. For testing, metadata and real-time measurements of weather stations and smartphones are inserted into two Sensor Observation Services, which are harvested by a Sensor Instance Registry. A usability study evaluates the application. Based on the participants’ feedback, suggestions for improvement and for future research are outlined.

Author: Raimund Schnürer

Supervisor: Dipl.-Geoinf. Simon Jirka

Co-supervisor: Dipl.-Geoinf. Daniel Nüst

PDF: MasterThesis-Schnrer536.pdf

SITCOMExtracting Indoor Map Data From Public Escape Plans On Mobile Devices

Due to the non-applicability of GPS devices and the higher need for accuracy, collecting indoor spatial data presents different challenges than mapping outdoor environments. Considering usability or technical requirements, existing approaches for data capture indoors are poorly suited for non-professional collaborators of volunteered geographic information (VGI) communities, such as OpenStreetMap (OSM). This work investigates an alternative to measuring what has been measured already. The idea is to extract map data from public escape plans by means of computer vision. An approach to automatically interpreting photos of escape plans on mobile devices is developed and evaluated.

Author: Georg Tschorn

Supervisor: Prof. Dr. Christian Kray

Co-supervisor: Klaus Broelemann

PDF: MasterThesis_GeorgTschorn416.pdf

STMLImproved DGNSS-based Positioning of Micro UAV Platforms for Sensor Web Services

The usage of Micro Unmanned Aerial Vehicles (MUAV) as mobile sensor platforms is constantly increasing in the scientific, as well as in the civilian sector. A variety of requirements evolve from upcoming mission tasks like documentation, surveying and inspection in agriculture and geography, as well as in the industry. Many applications, such as the creation of orthoimages or the inspection of industrial plants need accurate position information in real-time, both for safety-in-flight reasons and for enriching sensor data by the provision of location.

As current MUAVs make use of common Global Positioning System receivers and, therefore, do not guarantee reliable high-precision positioning, this work examines the demands on an improved Differential Global Navigation Satellite System (DGNSS) positioning system for its integration into an existing MUAV platform. It proposes a flexible system architecture and presents a modular prototype that offers the possibility to exchange discrete components for making use of more sophisticated technologies like Precise DGNSS. The described prototype already guarantees horizontal positioning accuracy of 35 cm in real-time, which can be considered as sufficient for the majority of applications.

Consequently, this work focuses on the integration of position and additional navigation data into an existing Sensor Platform Framework software, which is able to synchronize sensor and navigation information on-the-fly. It introduces a MUAV platform-specific Input-Plugin for decoding the telemetry data stream and for the communication with the framework. As the framework is able to forward the processed geodata in a standardized way according to the guidelines of the Open Geospatial Consortium Inc., the data can be exploited by any kind of Sensor Web Service in near real-time.

Author: Jakob Geipel

Supervisor: Prof. Dr. Edzer Pebesma

Co-supervisor: Dr. Torsten Prinz

PDF: MasterarbeitJakobGeipel501.pdf

SITCOMCollaborative, Version Controlled Map Editing

Geo-spatial applications, for instance, geographic information systems (GIS) are increasingly realized as online platforms. Browser-based approaches facilitate broad accessibility and thus allow collaborative work. Regarding map based editors, collaboration is in most cases done asynchronous and does not support real-time concurrent editing. Many workflows, such as gathering data in case of a disaster could however benefit from allowing multiple users to simultaneously work together on the same dataset. A browser-based map editor, called Ethermap, was developed facilitating this kind of real-time interaction supported by means for increasing user awareness, an interactive version control, a well as explicit communication about geo-objects. This work reports on implications and limitations from several evaluation methods (focus group, user study, interviews, technical evaluation) indicating the importance of facilitating user awareness, as well as an increased efficiency, which can arise through real-time collaborative map editing.

Author: Dennis Wilhelm

Supervisor: Prof. Dr. Christian Kray

Co-supervisor: Thore Fechner

PDF: MasterThesis_Wilhelm326.pdf

SITCOMAttacking Location Privacy: Exploring Human Strategies

The proliferation of location-based services in recent years has highlighted the need to consider location privacy. This has led to the development of methods enhancing location privacy, and to the investigation of reasons for sharing location information. While computational attacks on location privacy and their prevention have attracted a lot of research, attacks based on human strategies and tactics have generally been considered implicitly. This work addresses this knowledge gap by reporting on a user study which was conducted in the context of a location-based game. Participants had to identify other players over the course of several weeks. The results show that human strategies for deanonymization and reidentication can be highly successful and thus pose a threat to location privacy comparable to computational attacks. By incorporating real-world knowledge that is not easily available in automated attacks, human players were able to eciently re-identify other people in the game.

Keywords: re-identication, deanonymization, location privacy.

Author: Thore Fechner

Supervisor: Prof. Dr. Christian Kray

Co-supervisor: Prof. Dr. Antonio Krüger

PDF: msc_fechner165.pdf

SITCOMEvaluation of Visual Feature Detection Algorithms to Implement Augmented Reality Applications for Indoor Environments on Mobile Devices

This master thesis describes the evaluation of different image recognition algorithms. The aim is to find an appropriate technique to provide real time indoor Augmented Reality applications. Therefore, the promising approach of using existing infrastructure in the form of images or shop logos instead of markers is verified. Furthermore, the most appropriate algorithm in detection accuracy and time, SIFT, is tested for its real time abilities. Several techniques of how to improve the not sufficient calculation latency are tested and discussed. With the gained information a prototypical Augmented Reality that is based on image recognition is developed.

Author: Philipp Weiß

Supervisor: Prof. Dr. Christian Kray

Co-supervisor: Thomas Bartoschek

PDF: PhilippWei-Masterarbeit693.pdf

SILTalking about space vs. sketching space: A investigation of the differences in conveying spatial information

People live in a world where space and time are two fundamental variables. Everything
people do is related to space and time. During their daily life people build up a cognitive map and rely on it in several wayfinding and navigation tasks. However conveying spatial information to other people is not obvious. Apart from referring to a map or absolute reference systems like coordinates, people use two main modalities for conveying spatial information: the textual mode and the graphical mode. The textual mode means both, conveying spatial information orally or written. Both modalities are used to externalise parts of peoples cognitive map by describing either textually or by sketching. Besides technical devices are used to support peoples spatial behaviour. This devices rely on the textual and graphical modalities in conveying spatial information as well.

Author: Heinrich Löwen

Supervisor: Angela Schwering

Co-supervisor: Stephan Winter

SILDeveloping and Testing different Visualizations of Off-Screen Landmarks for Car Navigation Systems

Along with the increasing proliferation and power of mobile devices, mobile maps (e.g. in pedestrian navigation systems) become both feasible and popular [Allen, 2000]. In contrast to the navigation mode in car navigation systems, pedestrians prefer route instructions based on salient objects [Kluge and Asche, 2012]. Although it is easy for users to get guided to a location, research suggests that the effects are negative. Moreover, users become device-focused and develop a reduced understanding of the environment [Munzer et al., 2006]. Accordingly, users might get lost in cases of inaccurate instructions or failures of the system as they only focus on the given route and turning-point instructions. Consequently, studies suggest that wayfinding and learning of the environment can be influenced through visual presentation modes with mobile applications [Munzer et al., 2012]. One type of information that are mostly not considered in mobile navigation solutions are landmarks. However, it has shown that landmarks are an important supportive element in wayfinding tasks [Golledge, 1999]. One of the key strengths of a map is that it can visualize features and their spatial relationships of a large area. Though, the limited space of mobile devices leads to a visualization of only a discrete view of an area. As consequence, the acquisition of spatial knowledge is impacted
with respect to accuracy and response time [Dillemuth, 2009]. Since the space of
the display is limited, landmarks are often outside of the displayed area. Accordingly, they have to be mapped on-screen to overcome this limitation. Research has already shown that displaying distant landmarks on-screen holds positive effects on supporting persons acquisition of directional knowledge that benefits spatial orientation [Li et al., 2014]. For the reason that the chosen visualization does not convey information about distance from the user’s position to the distant object a better visualization has to be provided. Research already provides several approaches to display distant objects on small displays (e.g. [Baudisch and Rosenholtz, 2003], [Gustafson et al., 2008], [Bertel et al., 2014]). However, given approaches are mainly focused on guiding a user to a distant
location. Therefore, this thesis will aim at adapting common approaches of research to display off-screen landmarks in order to investigate in what extent spatial orientation is supported while navigating through traffic.

Author: Daniel Schumacher

Supervisor: Angela Schwering

Co-supervisor: Joy Anacta / Jakub Krukar

SILEnhancement of a Citizen Driven Sensor Network: Usability Engineering for Successful Open Citizen Science

The usage of do-it-yourself (DIY) sensor stations based on open-source hardware for participatory sensing as a basis for large-scale sensor networks is a novel approach in the field of citizen science. In that context, DIY sensors can build a basis for large-scale sensor network applications. Since the installation is performed by non-professionals, extensive user support has to be provided in order to achieve satisfactory results.

The SenseBox is an open-source toolkit for participatory sensing, which offers well-documented tutorials for sensor applications based on Arduino microcontrollers. This system has been applied in scientific workshops with secondary school students to teach them programming in a playful and simple way. All data that is being collected with the SenseBox construction kits is published on OpenSenseMap, a platform for sharing open sensor data. There was an increasing demand of the DIY toolkits after the project was publicly promoted and the OpenSenseMap was officially launched. Consequently this approach was adopted to a standalone DIY sensor station for participatory sensing. A second version of the SenseBox was developed, which is more focusing on long-term deployments of local environments than on an educational approach.

After an initial test phase where citizens were equipped with SenseBox construction kits for continuous measurements, it was discovered that most of the stations were disconnected after a short time period. Subsequently a user study was performed to reveal possible error sources during the wiring process, software installation and integration into the sensor network. It turned out that missing general computer skills, like the installation of application software, led to larger problems than wiring of hardware parts.

This Thesis focuses on usability enhancements for the SenseBox and OpenSenseMap to enable citizen driven long-term deployments of DIY sensor stations in outdoor environments.

The research fields of Human Computer Interaction (HCI) and Usability Engineering (UE) provide well described guidelines and frameworks for designing intuitive user interfaces. These concepts can be adapted to the open hardware approach of SenseBox, the sensor registration on OpenSenseMap and the documentation material. Intermediate results of an ongoing test run are demonstrating that the usability of the project can be enhanced with the methods provided by the heuristics of UE.

Author: Jan Wirwahn

Supervisor: Prof. Dr. Angela Schwering

Co-supervisor: Thomas Bartoschek

SILVisualizing off-screen landmarks on maps for mobile devices

Mobile devices have become increasingly popular in supporting people to find their ways in our daily lives. Providing navigation support is not only guiding a wayfinder to reach one or multiple destinations. More importantly, it should support the wayfinder’s spatial orientation to improve the wayfinder’s awareness of the environment. Research has suggested approaches to enhance a person’s spatial orientation while using maps on mobile devices by visualizing distant off-screen landmarks with landmark-indicating icons at the edge of the screen to indicate directions (LI, KORDA, RADTKE, SCHWERING 2014). An amendment to this design is to incorporate distance into the design and placement of landmark-indicating icons. Research explored various methods to visualize distant off-screen locations which are focusing of indicating distance and direction such as Halo (circles at the edge), Wedge (triangles at the edge) and Stretched (arrows at the edge) (BERTEL, KOHLBERG, LUTTER, SPENSBERGER 2014; BOLL, HENZE, 2011), but these methods are distinguishing the locations from each other just by using different colors. In context of categorized points of interest, it is useful to visualize different categories of points at the same time in different colors (such as automatic teller machines in a one and restaurants in another color). But global landmarks are unique and specifiable from each other and thus, it is not useful to create a category containing multiple global landmarks. Hence, using only different colors in combination with Halo, Wedge, and Stretched will not help users to identify distant off-screen landmarks. A new approach of visualizing identifiable landmark-indicating icons enhanced with distance information to those off-screen landmarks is subject of investigation.

Author: Maruin Radke

Supervisor: Angela Schwering

Co-supervisor: Jakub Krukar

GeoSimStrategies for Automated Updating of Road Networks for Driving Simulations

Self-driving cars are a highly debated topic in the media, in research, and in industry. As it is much cheaper to test technologies for such cars in simulations before testing them in the real world, it is very important to create suitable environments for these simulations. The real world road network can change rapidly. These changes have to be reflected in the simulations, preferably in an automated way. This master thesis will try to answer the question to which extent it is possible to automate the updating of road networks for driving simulations and how this (partial or full) automation can be achieved.

Author: Marius Runde

Supervisor: Judith Verstegen

SILPointing to a place you cannot reach

Human spatial memory has been classified between (a) "survey knowledge" of spatial configuration (e.g. knowing where two places lie on the map of a city), and (b) "route knowledge" of specific paths (e.g. knowing how I can get from the library to my favourite pub). There are numerous established methods to measure (a) and (b), but they were rarely applied in situations where survey and route knowledge suggest contrasting directions. Such situations typically occur when there is a barrier between us and the destination we want to reach (e.g. I want to go to the zoo from Mensa, but I would need to go around Aasee instead of reaching it directly). If asked to point towards the destination, we would have to point through that barrier (e.g. the lake), but if asked to walk we would head in another direction (around the northern or southern side of the lake). Our early findings suggest that people's pointing might be biases in such situations in the northern or southern direction. This thesis will involve designing an in-the-wild experiment located in few areas of Münster in order to test this assumption. Knowledge of German is recommended, as the experiment will involve recruiting pedestrians in the city for a brief pointing exercise. 

Montello, D. R. (1998). A new framework for understanding the acquisition of spatial knowledge in large-scale environments. In M. J. Egenhofer (Ed.), Spatial and Temporal Reasoning in Geographic Information Systems (pp. 143–154). New York: Oxford University Press.


Montello, D. R., Richardson, A. E., Hegarty, M., & Provenza, M. (1999). A comparison of methods for estimating directions in egocentric space. Perception, 28(8), 981–1000.


Author: Sarah Abdelkader

Supervisor: Jakub Krukar

GeoSimDetecting direct systemic changes in an agent based model with a rolling calibration methodology

Models are simplified representations of real-world systems developed to better understand complex systems and to project their future system states under different scenarios. Ideally, after programming a model, its parameters are calibrated with respect to a set of observational data. Most calibration methods use a set of fixed parameters for the whole model runtime. This presumes stationarity of the processes in studied system, while this may not be the case in reality. Non-stationarity, also called systemic change, can cause large errors in the future projections modelled with fixed parameters. Therefore, it is important to at least assess if model parameters have been stable with respect to historic observations of the system. Developing a method for systemic change detection can best be done in a closed, fully understandable and controllable system, as this eases performance assessment of the method. Hereto, this thesis evaluates a method to detect systemic changes using an agent-based model and real observation data of a simple, closed system in which systemic changes are induced manually.

Author: Clara Rendel

Supervisor: Judith Verstegen

GeoSimSpatial-Temporal Crop Yield Analysis in East Kalimantan, Indonesia

As the largest agricultural country in South East Asia, Indonesia possesses enormous agriculture resources. In the last decade, Government of Indonesia has focused on the production development of 4F crops (Food, Feed, Fiber and Fuel). Indonesia had 101 million hectares plantable agricultural area in 2014 which comprised of 47 million hectares cultivated area and the remaining 54 million hectares were expandable agriculture lands. Vast land use land cover (LULC) change has occured recently due to the excessive expansion of oil palm, rubber, pulpwood and mining industries, particularly in East Kalimantan. Two districts that exhibit significant LULC change are Kutai Barat and Mahakam Ulu. 78.5 thousand ha of rubber, 31 thousand ha of oil palm and 23.6 thousand ha of pulpwood plantation have expanded in the Kutai Barat and Mahakam Ulu districts between1990 and 2009. Although LULC change is often considered unwanted, it has also contributed to positive economic effects. In order to examine the economic benefits of the agriculture expansion, land use area does not suffice: it is necessary to understand the geographic distribution of crop yield within the districts. A problem herein is that crop yield data is mostly conveyed at national, provincial or municipal level; not in at the pixel level. Hence, we intend to apply a spatial crop yield allocation model to generate pixel level crop yield representation of Kutai Barat and Mahakam Ulu districts in 2000 and 2009 based upon available regional crop yield data and a LULC map. Next, we plan to analyze its spatial-temporal pattern within that period of time with the aim to be able apply the same pattern to a LULC map projection in 2030, in order to project the production in 2030 under 4 diverging scenarios.

Author: Muhammad Wakhid Pramujati

Supervisor: Judith Verstegen

Co-supervisor: Carina van der Laan

GeoSimGeospatial Prediction of Customer Energy Consumption for Rural Mini Grids

Predicting energy consumption for customers has many benefits. This prediction can help companies know what consumption future connections would have and it can help them decide whether to setup a grid in a community. This prediction is also important for solar mini-grid companies as it can help them setup mini-grids in new villages where they just have the data on the prospective customer houses. This prediction would be done based on the spatial characteristics of the houses and the consumption data of the already connected customers. These characteristics of customer houses are termed factors in this research. The aim of the project is to identify how these geospatial factors indicate and can help predict customer electricity consumption. E. ON Off Grid Solutions (EOGS) operates solar mini-grids in 8 villages in Tanzania. For this research, two villages namely Komolo and Temeke would be used as the case study areas. A regression model would be developed where the customer consumption would be predicted by the factors such as roof type, size, material etc. Here the consumption would act as the dependent variable and the factors would be the predictors. The performance of the model would be checked by comparing it with real customer consumption data. Once the quality is validated this model would be extended to other villages operated by EOGS as well.

Author: Shahzeib Tariq Jaswal

Supervisor: Judith Verstegen

Co-supervisor: Frankie Eckersley-Carr (E.On)

GeoSimPredicting the spatial development of flooded areas by modeling the hydrological processes using short-term weather prognoses

Insurance companies that provide flood insurance often need real time information about flood events to verify insurance claims and to react accordingly. The current extend of a flood can be extracted from Sentinel-1 satellite images. The problem with this approach is that the images are only available every few days. Aim of this thesis will be to predict the future spatial development of the identified flooded areas by modeling the hydrological processes on the level of small catchments. A special focus will be on the data published by the German weather service on its open data portal. Both measurements of past weather conditions and the outputs of the short-term prognosis model COSMO-DE will be considered. The expected result is a workflow that allows predicting the development of the detected waterbodies over the next days.

Author: Jan van Zadelhoff

Supervisor: Judith Verstegen

Co-supervisor: Edzer Pebesma

GeoSimEvaluation of GPM Precipitation Estimates for Heavy Rain at the West-Coast of Norway

Precipitation plays an important role within the hydrological cycle and has impact on human life. Estimating the precipitation amount at a speci c location at a particular time can be crucial for agriculture, energy supply and risk management, as well as for research in order to provide better understanding of patterns of water distribution. However data about precipitation mostly relies on ground measurement stations which are unevenly distributed in space and rarely placed at locations diffcult to access. An additional diffculty of correct estimates is the uneven distribution of precipitation within time. Due to the regularity of satellites passing over a speci c location their measurements of the atmosphere represent a valuable data source. However the availability of freely accessible precipitation estimation products derived form satellite sources is limited for high latitudes of the Earth. The aim of this master thesis is to evaluate estimation products provided by the Global Precipitation Measurement
(GPM) mission for the case of heavy rain at the West-Coast of Norway. In this case study, the focus is on the reflection of ground measured observations by the satellite products for the location of Bergen as well as for a larger spatial extent covering the West-Coast of Norway within the latitudes 62N and 58N. Sources for the ground measurements will be data from horizontal weather radars and an interpolated precipitation grid based on measurements from stations. For the location of Bergen additionally ground measurements preformed with a disdrometer, a micro-rain radar and a rain gauge will be taken into account. For the comparison of satellite estimated precipitation rates with ground measurements from di erent sources the Pearson Correlation Coeffcient, the Relative Bias and the Root Mean Square Error will be calculated. As an extended goal the probability of precipitation detection by the satellite product might be assessed.

Author: Alicja Balfanz

Supervisor: Judith Verstegen

Co-supervisor: Harald Sodemann

GeoSimMulti-sensor approach to map the center line of a railway track

A dataset of railway tracks of good positional accuracy would be an important asset to railway companies and researchers. Railway track data is provided for free by some sources, namely the OpenRailwayMap, INSPIRE railway network and the Deutsche Bahn. However, the geometry of the track is not well-defined in several portions and they also lack positional accuracy and completeness. The Institute of Transportation Systems, Deutsches Zentrum für Luft- und Raumfahrt (DLR) has developed a measurement vehicle called the ‘RailDriVE’ that has several sensors, including several high quality Global Navigation Satellite System (GNSS) receivers, an Inertial Measurement Unit (IMU) and a Laser Scanner.

The goal of the current work is to compare three different approaches to create a track of good quality from the measurements made by these sensors. The performance of these approaches in different environmental conditions (for example, open areas, forests) will also be assessed. In the first approach, the GNSS data points will be filtered based on their quality and then fused with IMU data using advanced sensor fusion algorithms. The center line of the track will be derived from the GNSS-IMU fused data. For the second approach, the point cloud obtained from the laser scanner data will be georeferenced using GNSS data and the center line of the track will be derived from the georeferenced point cloud. In the third approach, the GNSS-IMU fused points from the first approach will be used to georeference the laser scanner data and the center line will be derived from the georeferenced point cloud similar to the second approach. The accuracy of the result of each approach will be evaluated using aerial images provided by the GeoDataPortal of Sachsen as the reference data. Finally, the best result obtained would be submitted to OpenRailwayMap so that it is beneficial to the community.  

Author: Sangeetha Shankar

Supervisor: Judith Verstegen


SWSLVisualising Interpolations of Dynamic Phenomena Observed by Mobile Sensors

Visualisation is an important tool in explorative analysis and new technologies provide an unprecedented amount of live environmental sensor data. Interpolations derive data with high spatial coverage from these in-situ observations. This work develops methods to combine the visualisation of sensor platforms and interpolations based upon their observations to increase the understanding of the observed dynamic environmental phenomenon. These techniques span across visual variables such as animation, colour or size, and are supplemented with a variety of visual aides to facilitate interpretation in a three-dimensional real-time visualisation environment. A software prototype joins existing technologies to present new techniques for visualisation on a virtual globe. It successfully renders live data from an unmanned aerial vehicle in a test deployment. A user study investigates the developed solutions. This study supports the hypothesis that a user’s understanding of a phenomenon can be improved with a real-time, integrated visualisation of sensor positions and interpolation. An extensive discussion identiVes the useful techniques, features and architecture components for the targeted application.

Author: Daniel Nüst

Supervisor: Edzer Pebesma

Co-supervisor: Werner Kuhn

SITCOMNavigating in transitional Spaces

There are many systems and approaches that support pedestrian navigation indoors and/or outdoors; this project would look at spaces that are neither just indoors nor fully outdoors (e.g. how people navigate them, what problems they face and how they describe them)

Author: Martin Ulitzny

Supervisor: Chris Kray