Data collection using satnav tracelog

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Available languages — Data collection using satnav tracelog
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  • iD, JOSM - will let you observe tracelog without uploading it to server if it's precision is too bad
  • You may improve precision using special hardware and advanced raw data processing techniques like RTKLIB, but this is definitely not for your first edit or seek someone with good knowledge since we don't have good guides ATM
  • Stand still until you get a fix
  • One second interval is recommended starting value in urban areas
  • Make remarks during record of tracelog using short descriptive comments
  • Check battery level before journey
  • Avoid using 3D fix as measure of accuracy
  • Standing still, moving faster or slower:
    • Will not affect true accuracy (proof? expand?)
    • It will affect when and where you will get data from satellite
    • You may want to slow down near interesting objects to ensure that you received position from satellite. Again, it will not improve positional accuracy.


  • You will get an estimate of your position up to some precision (consumer grade is about ~7 meters)
  • It constantly tracks your location, so it will assist using your memory since your memory isn't perfect and you cannot memorize precisely every length or every your turn of your route (and especially after long route)


Highly clustered satellites can give large errors.
A disperse set of satellites improve accuracy.
  • You need good fix
  • There many things are against you:
    • Bad weather
    • Hilly terrain
    • Satellite receiver inside enclosed space (inside your car!), inside buildings (expect precision several times worse than you target for)
    • Satellites are located too close to each other
  • You need satnav receiver: either you buy one (or loan from your friends) or use integrated chip (inside phone or in your camera)
  • Time:
    • To check weather or position of satellites (and you cannot skip it)
    • To convert and/or filter tracelog (but you can automate it to some degree)
    • To process all notes with tracelog

See also

  • In case you don't have camera with your satellite navigation, it is good idea to use camera or video in addition to satellite navigation device - but it may require additional time
  • RTKLIB - (advanced topic; requires additional hardware) tool to work on raw satnav data
  • Category:Tracelog hosting software and platforms for alternatives to OpenStreetMap hosting
  • JOSM - you may work entirely offline (using saving and loading from .osm files) and connecting to Internet only to submit your work when it's done

External links