Stefan Hahmann, Dr.

Dr. Stefan Hahmann was a PostDoc Researcher at the GIScience Research Group of the Institute of Geography in Heidelberg.

Research Interests

• Volunteered Geographic Information (VGI): OpenStreetMap, Twitter, Wikipedia, Flickr
• Routing, Navigation, Graphs
• Web Map Services and Web Mapping Applications (including 3D)
• Map Generalisation
• Augmented Reality
• Mobile applications

Projects

• CAP4ACCESS – Collective Awareness Platforms for Improving Accessibility in European Cities & Regions

Offered Courses

• WS 2015/16: Cartography (Zipf, Jonietz, Hahmann)

News

Curriculum Vitae

• Since 09.2014: Research associate, GIScience research group, Institute of Geography, Heidelberg University
• 2014: PhD Degree, University of Technology (TU) Dresden
• 2014: PhD Scholarship, University of Technology (TU) Dresden
• 2011 – 2013: Research associate, Institute of Cartography, University of Technology (TU) Dresden
• 2009 – 2010: Research assistant (part-time), Institute of Cartography, University of (TU) Technology Dresden
• 2009 – 2011: Software engineer (part-time) for web-based geoinformation systems, MapChart GmbH, Dresden
• 2006 – 2009: Software engineer (full-time) for web-based geoinformation systems, Mapchart GmbH, Dresden
• 2002 – 2006: Diploma degree in Surveying with a major in geoinformatics, University of Applied Sciences (HTW) Dresden

Journal Papers

• John, S., Hahmann, S., Rousell, A., Loewner, M.-O., Zipf, A. (2016): Deriving incline values for street networks from voluntarily collected GPS traces. Cartography and Geographic Information Science. (Download).
• Hahmann, S., Purves, R.S. & Burghardt, D. (2014): Twitter location (sometimes) matters: Exploring the spatial relationship between georeferenced Tweets and feature classes, Journal of Spatial Information Science. iss. 9, pp. 1–36. (Download)
• Hahmann, S. & Burghardt, D. (2013): How much information is geospatially referenced? Networks and cognition International Journal of Geographical Information Science. vol. 27, iss. 6, pp. 1171–1189. (Download)
• Hecht, C. Kunze & Hahmann, S. (2013): Measuring Completeness of Building Footprints in OpenStreetMap over Space and Time ISPRS International Journal of Geo-Information. vol. 2, iss. 4, pp. 1066–1091. (Download)
• Kunze, R. Hecht & Hahmann, S. (2013): Zur Vollständigkeit des Gebäudedatenbestandes von OpenStreetMap Kartographische Nachrichten. vol. 63, iss. 2/3, pp. 73–81. (Download)
• Hahmann, S. & Burghardt, D. (2012): Forschungsergebnisse zur Frage: Haben 80% aller Informationen einen Raumbezug? gis.SCIENCE - Die Zeitschrift für Geoinformatik. vol. 25, iss. 3, pp. 101–108. (Download)
• Hauthal, E., Hahmann, S. & Wilfert, I. (2011): Mobile und Webmapping-Anwendungen für den Tourismus Kartographische Nachrichten. vol. 61, iss. 5, pp. 254–261. (Download)

Book Chapters

• Zipf, A., Mobasheri, A., Rousell, A., Hahmann, S. (2016): Crowdsourcing for individual needs - the case of routing and navigation for mobility-impaired persons. In: Capineri, C, Haklay, M, Huang, H, Antoniou, V, Kettunen, J, Ostermann, F and Purves, R. (eds.) European Handbook of Crowdsourced Geographic Information, p. 325–337. London: Ubiquity Press. DOI: http://dx.doi.org/10.5334/bax.x
• Voigt, C., Dobner, S., Ferri, M., Hahmann, S., & Gareis, K. (2016): Community Engagement Strategies for Crowdsourcing Accessibility Information. In: K. Miesenberger, C. Bühler, & P. Penaz (Eds.), Computers Helping People with Special Needs: 15th International Conference, ICCHP 2016, Linz, Austria, July 13-15, 2016, Proceedings, Part II. p. 257-264. DOI: 10.1007/978-3-319-41267-2_35
• Hahmann, S., A. Zipf, A. Rousell, A. Mobasheri, M. Rylov, E., Steiger, L. Loos, J. Lauer (2016): GIS-Werkzeuge zur Verbesserung der barrierefreien Routenplanung aus dem Projekt CAP4Access. AGIT - Journal für Angewandte Geoinformatik. Vol. 2, pp. 328-333. DOI: 10.14627/537622047
• Hahmann, S. & Burghardt, D. (2011): Maple – a Web Map Service for Verbal Visualisation Using Tag Clouds Generated from Map Feature Frequencies, in: Ruas, A. (ed.) Advances in Cartography and GIScience. Volume 1. Selection from ICC 2011, Paris. Springer: Heidelberg, pp. 3–12. (Download)

Conference Contributions

• Miksch, J., Hahmann, S., Resch, B., Lauer, J. (2016): How to Cross Open Spaces?. Free and Open Source Software for Geospatial (FOSS4G) 2016, Bonn.
• Rousell, A., Hahmann, S., Mobasheri, A. (2016): A Two-Tiered Approach to OSM Data collection for Novice Users. 19th AGILE Conference on Geographic Information Science. Helsinki, Finnland.
• Hahmann, S., Mastaler, L. (2016): Ableitung von Gehwegdaten mit Hilfe georeferenzierter Bilder und Interpretation der „Crowd“. 64 Kartographentag - Geoinformatik 2016. Potsdam, Germany.
• Hahmann, S., Miksch, J., Lauer, J., Zipf, A. (2016): Algorithmen für die Routenplanung durch Flächen in globalen Datensätzen. 64 Kartographentag - Geoinformatik 2016. Potsdam, Germany.
• Hahmann, S. (2015): Detection of Urban Street Properties using Georeferenced Images and Interpretation from the Crowd. 1. International Land Use Smyposium (ILUS 2015). Dresden, Germany.
• Voss, H., Hahmann, S., Mobasheri, A., Rousell, A., Spindler, R. (2015). Utilizing Viennese Geographic Open Government Data For Better Inclusion Of Mobility-Impaired Persons. European Data Forum (EDF) 2015, Luxembourg.
• John, S., Hahmann, S., Zipf, A. (2015): Automatisierte Ableitung des Gefälles von Straßen und Wegen aus OpenStreetMap GPS-Tracks. 59. Deutscher Kongress für Geographie (DKG 2015). Berlin, Germany.
• Törnros, T., Dorn, H., Hahmann, S., Zipf, A. (2015): Uncertainties of completeness measures in OpenStreetMap - A Case Study for buildings in a medium-sized German city, ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Science, II-3/W5, 353-357, doi:10.5194/isprsannals-II-3-W5-353-2015. The 9th International Symposium on Spatial Data Quality (ISSDQ 2015), La Grande Motte, France
• Hahmann, S., Bakillah, M., Mobasheri, A., Rousell, A. (2015): Integrating options for wheelchair users into an open route planning service: state-of-the-art and open challenges. Poster. GI Forum 2015. Salzburg, Austria.
• John, S., Hahmann, S., Zipf, A., Bakillah, M., Mobasheri, A., Rousell, A. (2015): Towards deriving incline values for street networks from voluntarily collected GPS data. Poster. GI Forum 2015. Salzburg, Austria.
• Mobasheri, A., Bakillah, M., Rousell, A., Hahmann, S., Zipf, A. (2015): On the completeness of sidewalk information in OpenStreetMap, a case study of Germany. Poster. AGILE 2015, Lisbon, Portugal.
• Rousell, A., Bakillah, M., Hahmann, S., Mobasheri, A. (2015): Extraction of landmarks from OpenStreetMap for use in navigational instructions. Poster. AGILE 2015, Lisbon, Portugal.
• Bakillah, M., Mobasheri, A., Rousell, A., Hahmann, S., Arsanjani, J.J., Liang, S.H.L. (2015): Toward a collective tagging Android application for gathering accessibility-related geospatial data in European cities. Extended Abstract. AGILE 2015, Lisbon, Portugal.
• Burghardt, D., Bertone, A., Hahmann, S. & Nicola, R. (2014): Kategorisierung und Visualisierung von Twitter Daten - Anwendungsfall Hochwasser Sachsen 2013 in 62. Deutscher Kartographentag. Hamburg, Germany. (Download)
• Kunze, C., Hecht, R. & Hahmann, S. (2013): Assessing the Completeness of Building Footprints in OpenStreetMap: An Example from Germany in Proceedings of the 26th International Cartographic Conference. Dresden, Germany. (Download)
• Hahmann, S. & Burghardt, D. (2013): On the Influence of Geospatial Context on Mobile Microblogging Contents in Proceedings of the 26th International Cartographic Conference. Dresden, Germany. (Download)
• Hahmann, S. & Burghardt, D. (2012): Investigation on factors that influence the (geo)spatial characteristics of Wikipedia articles in Proceedings of extended abstracts, 7th International GIScience Conference. Columbus, OH, USA. (Download)
• Hahmann, S. (2011): Das Semantische Web in der Forschung - Haben 80% aller Informationen einen Raumbezug? in 3. Leipziger Semantik Web Tag, Agile Knowledge Engineering and Semantic Web Group (AKSW). Leipzig, Germany. (Download)
• Hahmann, S. & Burghardt, D. & Weber, B. (2011): “80% of All Information is Geospatially Referenced”??? Towards a Research Framework: Using the Semantic Web for (In)Validating this Famous Geo Assertion in 14th AGILE International Conference on Geographic Information Science. Utrecht, Netherlands. (Download)
• Hahmann, S. (2010): Maple - Ein WMS zur Visualisierung von Tagclouds generiert aus OpenStreetMap Daten in Vorträge der 47. Tagung der Arbeitsgruppe Automation in Kartographie, Photogrammetrie und GIS. Dresden, Germany. (Download)
• Hahmann, S. & Burghardt, D. (2010): Linked data – a multiple representation database at web scale? in Proceedings of the 13th ICA Workshop on Generalisation and Multiple Representation. Zurich, Switzerland. (Download)
• Hahmann, S. & Burghardt, D. (2010): Connecting LinkedGeoData and Geonames in the Spatial Semantic Web in Proceedings of extended abstracts, 6th International GIScience Conference. Zurich, Switzerland. (Download)

Theses

• Hahmann, S. (2014): Zur Beziehung von Raum und Inhalt nutzergenerierter geographischer Informationen. PhD thesis, TU Dresden. (Download)
• Hahmann, S. (2006): Automatische Generalisierungsverfahren zur Vereinfachung von Kartenvektordaten unter Berücksichtigung der Topologie und Echtzeitfähigkeit. Diploma thesis, HTW Dresden. (Download)

Reviews

• International Journal of Geographical Information Science
• Transactions in GIS
• Cartographica
• Cartography and Geographic Information Science