[OSM-dev] Altitude data & (cycle) route profiles
siliconfiend at gmail.com
Mon Mar 31 15:13:33 BST 2008
On Mon, Mar 31, 2008 at 9:02 AM, Robert Vollmert <rvollmert-lists at gmx.net>
> 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.
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.
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