On Fri, Jan 15, 2010 at 4:11 PM, Simone Cortesi <sim...@cortesi.com> wrote: > On Fri, Jan 15, 2010 at 17:07, John F. Eldredge <j...@jfeldredge.com> wrote: >> You may be seeing the earthquake damage, since it damaged or collapsed >> thousands of buildings, and may well have caused some coastal changes via >> landslides, the raising or lowering of land, etc. > > so, the image is correctly placed and I can safely move the coast > around to match it?
The imagery isn't rectified using ground control points obtained via GPS units, if that's what you're asking, so no, it's not going to be 100% accurate. I'm not certain what was used to rectify it, but I suspect either Yahoo imagery or OSM data itself. If you find an area where all the OSM data is off by a fixed amount, then don't worry about moving the data, move the imagery instead. And don't worry about it overly much, since anyone on the ground with a GPS unit will be able to cope with a 5-10m displacement. Cheers, Andy _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
