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On next Monday, Dr. Tessio Novack from the Technical University of Munich (photogrammetry and remote sensing research group) will give the second presentation in our currently running GIScience colloquium lecture series.
He will introduce some of the main approaches for deriving land use information from remote sensing imagery. Further, potentials and limitations of corresponding techniques are briefly discussed.
We are looking forward to seeing you next Monday:

Dr.-Ing. Tessio Novack,
Deriving urban land use from image data – potentials, limitations and main approaches
When: Mon, May 30, 2016, 2 pm,
Where: Heidelberg University, Institute of Geography, INF 348, Lecture Hall (Room 015)

Note: Please note the changed time slot. Previous talks took place at 4 pm.

The Special Issue: Human Dynamics in the Mobile and Big Data Era of the International Journal of Geographical Information Science (IJGIS), Volume 30, Issue 9 is now available online on Taylor & Francis Online.

This issue includes our article:
Exploration of spatiotemporal and semantic clusters of Twitter data using unsupervised neural networks
Enrico Steiger, Bernd Resch & Alexander Zipf
Pages: 1694-1716 | DOI: 10.1080/13658816.2015.1099658

The investigation of human activity patterns from location-based social networks like Twitter is an established approach of how to infer relationships and latent information that characterize urban structures. Researchers from various disciplines have performed geospatial analysis on social media data despite the data’s high dimensionality, complexity and heterogeneity. However, user-generated datasets are of multi-scale nature, which results in limited applicability of commonly known geospatial analysis methods. Therefore in this paper, we propose a geographic, hierarchical self-organizing map (Geo-H-SOM) to analyze geospatial, temporal and semantic characteristics of georeferenced tweets. The results of our method, which we validate in a case study, demonstrate the ability to explore, abstract and cluster high-dimensional geospatial and semantic information from crowdsourced data.

This paper is together with related papers part of the PhD of Enrico Steiger.

The Tusaayaksat Magazine reports on the research activities at the Trail Valley Creek Research Station, Canada, where members of the LiDAR research group (Inga Beck, Sabrina Marx & Bernhard Höfle) captured in-situ data within the PermaSAR research project last summer: “Climate change research in our own backyard“, p. 58-63.

Save the date: On Wednesday June 08 it’s time again to start a OSM mapping event at the Department of Geography Heidelberg University. We want to continue this semester adding to previously successful mapping events organized by students, the disastermappers HD and GIScience HD in Heidelberg.

For many places in the world there are no maps. Sokodé, the third largest city in Togo requires digital maps for urban and regional planning. For this reason we want to start a OSM mapping action for the region Sokodé. We have collaborations with the end users of that data that also will add further local data and knowledge.

WHERE? Berliner Straße 48, PC-Pool

WHEN? Wednesday 08 June from 18.00

GIS knowledge can be useful for creating the maps in OpenStreetMap, but are not a prerequisite for this event. In the beginning a small tutorial will be given, which explains the relevant practical basics of OpenStreetMap and the specifics of the region and the mapping task.
Those who prefer to bring their own laptop can do these and we recommend to bring a mouse.

We are looking forward to mapping jointly with you for Togo!

hd osm missing maps mapathon

On 19th to 21st May, the European Citizen Science Association (ECSA) held its first international conference in Berlin. The event attracted scientists, practitioners, and of course citizens engaged in scientific projects from all over the world. Several tracks of presentations and discussions highlighted the current hot topics in citizen science, like learning and education through citizen science, scientific impacts and innovations triggered by citizen science, citizen science gaming, data quality, and many more. Ca. 100 posters presented state-of-the-art ideas, methods and results. Inspiring key notes by Rock Bonney, Lucy Robinson, Muki Haklay and Heribert Hofer set the stage for intensive discussions and exchange of ideas. The conference also witnessed the appearence of the first issue of the new journal Citizen Science - Theory and Practice, a publication of the Citizen Science Association (CSA, https://citizenscienceassociation.org/). Rick Bonney, one of the co-editors-in-chief, used the conference to encourage high-quality submissions from all areas of citizen science.

The GIScience research group at Heidelberg University is well in step with current developments in citizen science and related fields with projects on landuse monitoring, participation in urban planning, data quality in citizen science, and many more. Visit http://www.geog.uni-heidelberg.de/gis/forschung_en.html to learn more about our activities.

More information about the ECSA can be found here: http://ecsa.citizen-science.net/

Read more about the First International ECSA Conference here: http://www.ecsa2016.eu/index.html

Learn about Citizen Science - Theory and Practice: http://theoryandpractice.citizenscienceassociation.org/

As a member of both HCE (Heidelberg Center for the Environment) and IWR (Interdiciplinary Center for Scientific Computing) we are happy to make you aware of todays public presentation in the HCE colloquium series “Heidelberger Brücke”:

Title: Feature Extraction of Discrete Manifolds from Archaeological Findings to Cultural Landscapes

Lecture and discussion with Dr. Hubert Mara, Universität Heidelberg, Interdisciplinary Center for Scientific Computing (IWR)

Time: 23. Mai 2016, 16.00 Uhr s.t.

Location: Lecture Hall, Im Neuenheimer Feld 360

Abstract:
Smallest traces of human interactions with surfaces of objects and landscapes are important to detect to understand past events. Together with the growing amount of 3D-measurment from Digital Terrain Models down to archaeological finds there is an increased demand for automated analysis of discretized surfaces. In this presentation we show robust means to process such 3D-models consisting of millions of measuring points and triangles to visualize e.g. ancient watercourses. We will show how to extract more complex features i.e. script in 3D from archaeological findings, fingerprints and brick structures of medieval walls.

Earlier this semester Dr. Chiao-Ling started the GIScience colloqium series already with a presentation about An Ontology-based Semantic Interoperability Framework for Geospatial Information.
Now stay tuned and save the date for the further presentations in this semester:

Deriving urban land use from image data – potentials, limitations and main approaches
(Dr. Tessio Novack)
Mo, 30.05.2016, 14:00 (Uni HD, INF 348, Room 015)

Flood risk assessment at the future Mexico City International Airport
(Dr. Carolina Ramírez-Núñez)
Mo, 06.06.2016, 14:00 (Uni HD, INF 348, Room 015)

Time series analysis for forest change mapping
(Schultz, Michael)
Mo, 20.06.2016, 14:00 (Uni HD, INF 348, Room 015)

Volunteered geographic (mis)information? Measuring quality in crowdsourced maps
(Dr. Andrea Ballatore)
Mo, 27.06.2016, 14:00 (Uni HD, INF 348, Room 015)

Location matters – How GIS and new information technologies support coordination and decision making in the humanitarian sector
(Sandra Sudhoff)
Mo, 11.07.2016, 14:00 (Uni HD, INF 348, Room 015)

On the May 11 and 12, the 8. Dresdener Flächennutzungssymposium (the 8th Symposium of development, monitoring and usages of landuse Dresden) took place in Dresden, Germany. The symposium aims to bring together industry, academy and local government, in order to demonstrate and exchange latest developments in methods, tools and software for the management of landuse data. Further ideas for future applications in environmental monitoring, urban planning and energy consumption when using landuse data are being discussed.
The symposium is kept as a tradition and takes place once a year in the hotel of Königshof with luxury decorated salon hall in Dresden.

Dr. Hongchao Fan from GIScience Research Group at Heidelberg University was invited to give a talk on the symposium. He firstly presented the quality assessment of building data on OpenStreetMap (OSM) in the area of Heidelberg which has been conducted by comparing OSM data with authoritative data. Then Dr. Fan presented the conceptual framework of intrinsic quality assessment for OSM building data and demonstrated the preliminary experiments and results by using OSM building data in Baden-Württemberg (BW). According to the findings, the buildings are in high completeness in terms of mapping area, while the semantic accuracy is rather low. The positional accuracy and geometrical accuracy are currently evaluated by checking the rectangularity of building footprints and the topologies among buildings, as well as the topologies among buildings and street networks. The current experiments show that the geometric and positional accuracy of building data are quite high.
Taking the opportunity, Dr. Fan also appealed to the participants from the authorities for the Open Data issue.

Related Work and further Reading:

Fan, H., Zipf, A., Fu, Q. & Neis, P. (2014): Quality assessment for building footprints data on OpenStreetMap. International Journal of Geographical Information Science (IJGIS). DOI: 10.1080/13658816.2013.867495.

Törnros, T., Dorn, H., Hahmann, S., and Zipf, A. (2015): Uncertainties of completeness measures in OpenStreetMap - A Case Study for buildings in a medium-sized German city, ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., II-3/W5, 353-357, doi:10.5194/isprsannals-II-3-W5-353-2015

Ballatore, A. and Zipf, A. (2015): A Conceptual Quality Framework for Volunteered Geographic Information. COSIT - CONFERENCE ON SPATIAL INFORMATION THEORY XII. October 12-16, 2015. Santa Fe, New Mexico, USA. Lecture Notes in Computer Science.

Dorn, H., Törnros, T. & Zipf, A. (2015): Quality Evaluation of VGI using Authoritative Data – A Comparison with Land Use Data in Southern Germany. ISPRS International Journal of Geo-Information. Vol 4(3), pp. 1657-1671, doi: 10.3390/ijgi4031657

Fan, H., Zipf, A. & Fu, Q. (2014): Estimation of building types on OpenStreetMap based on urban morphology analysis. AGILE Conference, 3-6 June 2014, Castellón, Spain, for publication in the series Springer Lecture Notes in Geoinformation and Cartography, “Connecting a Digital Europe through Location and Place”

Yang, A., H. Fan, N. Jing, Y. Sun, A. Zipf (2016): Temporal Analysis on Contribution Inequality in OpenStreetMap: A Comparative Study for Four Countries. ISPRS International Journal of Geo-Information. 5(1), 5.

Jokar Arsanjani, J., Mooney, P., Zipf, A., Schauss, A., (2015): Quality assessment of the contributed land use information from OpenStreetMap versus authoritative datasets. In: Jokar Arsanjani, J., Zipf, A., Mooney, P., Helbich, M., (eds) OpenStreetMap in GIScience: experiences, research, applications. ISBN:978-3-319-14279-1, Springer Press.

Barron, C., Neis, P. & Zipf, A. (2013): A Comprehensive Framework for Intrinsic OpenStreetMap Quality Analysis. Transactions in GIS, DOI: 10.1111/tgis.12073.

Fan, H., Yang, B., Zipf, A. , Rousell, A. (2015): A polygon-based approach for matching OpenStreetMap road networks with authority data. International Journal of Geographical Information Science (IJGIS). Taylor & Francis. DOI:10.1080/13658816.2015.1100732

Goetz, M. & Zipf, A. (2013): The Evolution of Geo-Crowdsourcing: Bringing Volunteered Geographic Information to the Third Dimension. In: Sui, D.Z., Elwood, S. & Goodchild, M.F. (eds.): Crowdsourcing Geographic Knowledge. Volunteered Geographic Information (VGI) in Theory and Practice. Berlin: Springer. 2013, XII, 396 p.

Jokar Arsanjani, J., Mooney, P., Helbich, M., Zipf, A., (2015): An exploration of future patterns of the contributions to OpenStreetMap and development of a Contribution Index, Transactions in GIS, volume and issue pending, pp. pending. John Wiley & Sons. DOI: 10.1111/tgis.12139.

Bakillah, M., Liang, S. H. L., Mobasheri, A., Jokar Arsanjani, J. & Zipf, A. (2014): Fine resolution population mapping using OpenStreetMap points-of-interest. International Journal of Geographical Information Science (IJGIS). Taylor & Francis.

Salon Hall in Koenigshof

Salon Hall in Koenigshof

GIScience Heidelberg regularily contributes to the ISCRAM conferences. This year we again have four papers dealing with different aspects on crowdsoured geographic information (e.g. OpenStreetMap) in disaster response and management (e.g. OpenFloodRiskMap).

Eckle, M., Herfort, B., Alberquerque, J., Leiner, R., Wolff, R., Jacobs, C., Zipf, A. (2016): Leveraging OpenStreetMap to support flood risk management: A prototype decision support system for the identification of critical infrastructure. 13th International Conference on Information Systems for Crisis Response and Management. ISCRAM 2016. Rio de Janeiro, Brazil.

Anhorn, J., Herfort, B., Alberquerque, J. P., (2016): Crowdsourced Validation and Updating of Dynamic OSM Features: A Nepal Earthquake Case Study. 13th International Conference on Information Systems for Crisis Response and Management. ISCRAM 2016. Rio de Janeiro, Brazil.

Klonner, C., Marx, S., Usón, T. & Höfle, B. (2016): Risk Awareness Maps of Urban Flooding via OSM Field Papers- Case Study Santiago de Chile. 13th International Conference on Information Systems for Crisis Response and Management. ISCRAM 2016. Rio de Janeiro, Brazil.

Herfort, B., Eckle, M., de Albuquerque, J. P., (2016): Being specific about geographic information crowdsourcing: a typology and analysis of the Missing Maps project in South Kivu. 13th International Conference on Information Systems for Crisis Response and Management. ISCRAM 2016. Rio de Janeiro, Brazil.

Mit Geoinformatik zur knusprigen Pizza Margherita” - so lautet der Beitrag von Helen Sandbrink in der Sonderbeilage “Zeitungsflirt 2016” der Rhein-Neckar-Zeitung (RNZ) vom 10. Mai 2016. Frau Sandbrink beschreibt ihre Sicht auf die Geoinformatik, die sie durch einen Besuch am Geographischen Institut gewinnen konnte.

Quelle: Rhein-Neckar-Zeitung (Nr. 107/2016), Seite 5 in der Sonderbeilage “Zeitungsflirt 2016″, Autorin: Helen Sandbrink

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