Wednesday, December 29, 2010

A Geolocated Picture is Worth a 1000 Words in OSM Surveying

If I can use a digital picture to record OSM survey information, I will much rather do that than jot down notes with my pen and paper. I have trouble reading my own handwriting so the more I can avoid it the better.

The Java OpenStreetMap (JOSM) Editor has a very cool function that lets you geolocate your digital pictures against a .gpx file's track information. The key is that you need to know the time offset between your digital camera's clock and your GPS's clock. But once you have that sorted out, you simply turn on your GPS track recording, put it in your pocket and then start your survey by snapping as many photos as you can.

This video describes the process of geolocating those images in JOSM and how I would use that information to create OSM data.

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