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OpenStreetMap and positioning JaakLainesteOpenStreetMap Estonia Nutiteq.com
OpenStreetMap Wikipedia of maps Global database Focused to current street maps No elevation, history etc Community 300.000+ registered users Very strong in Germany Free and open to use CC-BY-SA license
How OSM is created Field mapping GPS traces Walking Papers – paper notes On-screen mapping Yahoo! Imagery Regional sources: e.g. Estonian National Land Board Imports USA: TIGER data Europe: Corine Land Cover etc
Data in OSM Databases Map data Nodes, ways, relations Tagged openly History: who, when, changesets GPS traces Base for map
GPS Trace data HTTP REST-based API Based on BBOX Tracks and trackpoints (lat/long) No timestamp, user ID GPX format (simple XML) Someone has been in point X Track details from database Timestamp, user ID
Map data Ways and nodes: User ID Editing time Information about locations: Probably editor has been in the point around editing time (+ maybe few weeks) Density of different editors Quite ambiguous
Key issues User is in „mapping mode“. May be special trip Most mappers do not upload/share GPS traces User can trace aerials, without being there Regional differences Very good in e.g. Germany, UK Limited in e.g. US (TIGER imports)
Other uses of OSM Use OpenStreetMap as a base map Positioning accuracy improvement GPS trace shows where people are more probably Share your GPS traces in OSM Contribute to OSM fix map of your neighbourhoods!
Study: distribution of GPS traces Two random cities picked Tartu, Estonia – well-known town Weimar, Germany – unknown town GPS traces downloaded for town area Tartu – 9x9 km, 160.000 points, 42 tracks Weimar – 7x7 km, 100.000 points, 33 tracks Spatial distribution of traces Visualized in 50 or 100-m grid