• Save
Openstreetmap, GPS traces and positioning
Upcoming SlideShare
Loading in...5
×
 

Openstreetmap, GPS traces and positioning

on

  • 2,321 views

Presentation in Mobile Tartu 2010 seminar

Presentation in Mobile Tartu 2010 seminar

Statistics

Views

Total Views
2,321
Views on SlideShare
2,217
Embed Views
104

Actions

Likes
1
Downloads
0
Comments
0

5 Embeds 104

http://www.maakaart.ee 62
http://maakaart.ee 23
http://www.openstreetmap.ee 15
http://www.neti.ee 3
http://webcache.googleusercontent.com 1

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment
  • ... And you can create it too?
  • You can see some roads which stand out

Openstreetmap, GPS traces and positioning Openstreetmap, GPS traces and positioning Presentation Transcript

  • 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
  • Mapping parties
  • 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
  • London – different editors
    ITOWorld extract
  • Using OSM data
    GPS track
    High precision – time and location
    Less users
    Map locations
    Low precision
    More users
    Movement distribution
    Places what and when users have visited
  • OSM advantages
    Coverage is:
    Global
    Quick, get the data now
    Free
    Real usability?
    Real coverage is variable
  • Coverage statistics
    http://wiki.openstreetmap.org/wiki/Statistics
    Registered users: ~300,000, <5% active
    About 6,000 editors/week
    Tracks
    Points: ~200,000,000,000
    Traces: 800,000 traces
    Map nodes: ~ 750,000,000
  • 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
  • Tartu map in OSM
  • Tartu GPS traces
  • Tartu, 100m grid of GPS points
  • Weimar map
  • Weimar, GPS trackpoints
  • Weimar, 50m grid
  • Map of central London
  • GPS traces
  • GPS points on map
  • London grid
    Points: 440 000, tracks: 220
  • Thank you!
    Jaak Laineste
    jaak@openstreetmap.ee
    www.openstreetmap.org
    wiki.openstreetmap.org
    Credits: Microsoft support for fixing my PowerPoint