Mike, thanks for the response. I would like to clarify that the 150 metres error is a (x,y) distance error. There is an additional altitude error of around 70 meters.
Regards, Shalabh On Sat, Oct 31, 2009 at 9:51 PM, Mike N. <nice...@att.net> wrote: > > 3. I parked my car near a village a day before, marked a waypoint. > > The satellite error was at +- 5metres. Today morning, I came back > > and marked another waypoint. This time the error was +-4 metres > > but this waypoint is 150 metres off the earlier one. The car keys > >were with me and I can vouch that my car does not move on its own. :) > > I haven't tried to calibrate elevation, assuming the GPS altitude has a > large error. But I would have expected the altimeter correction to return > to the same altitude after returning to the start point. I actually see a > 20-50 Meter error after a route of only a few hours. I doubt that the > barometric pressure had changed so much during my trip. > > > _______________________________________________ > talk mailing list > talk@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk >
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