On Wed, May 14, 2008 at 04:41:34PM +0200, Marcus Wolschon wrote: > GPS-devices are very, very good at providing correct coordinates > relative to the rest of the track. They are getting good at giving > the same coordinates twice, when walking the same road again a few > days later. > Thus small topological features can be mapped very well. They may > not be perfectly at the right place but they will be very accurately > located to nearby features. (Given a modern GPS-device. These things > improved quite a lot in the last years.)
This relative correctness will quickly break down in reality The problem is osm is a collaborative undertaking. So you'll find one user mapping the roads with a GPS receiver of chipset X while another wants to map the forest whatever with the yahoo satellite and yet another one is doing a building at the opposite side of the street with GPS receiver with chipset Y half a year later. All with different biases on their absolute positions... cu bart _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/dev
