On Mar 31, 2008, at 12:00, Andy Robinson (blackadder) wrote: > Also as a civil engineer I can see some merit in having elevation > data for > physical objects in the database. However, we don't really have a > good way > of collecting data that is remotely accurate to the level at which > it would > be significantly useful. Non survey grade GPS just doesn't cut > muster for > height data so we should never rely upon that. Even the Ordnance > Survey > doesn't currently record height data from survey grade GPS.
Not sure how common they are, but there's some GPS units with built-in barometer (Garmin Etrex Vista HCX at least). The data they provide should be good enough to be useful. Cheers Robert _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/dev
