On Mon, Mar 31, 2008 at 9:02 AM, Robert Vollmert <[EMAIL PROTECTED]> wrote:
> > 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 > I think they're fairly common (the Garmin 60CSx and the new Colorado model have it, too), but the accuracy probably wouldn't be any better than just using the SRTM data. Karl
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