I can't speak in regards to the horizontal error, but in regards to the vertical error, GNIS elevation is taken from the National Elevation Dataset (NED). The NED is a gridded dataset (30 meter posting I believe), and does not contain spot heights, which is what you want. In other words, the NED contains the *average* elevation for each grid cell, not the peak elevation.
Mike On Sat, Oct 23, 2010 at 6:52 AM, Nakor <[email protected]> wrote: > Hello, > > I was looking at peaks in Glacier National Park. There are quite a few that > have been imported from GNIS. NPS has also a database of such peaks. My > issue is that the databases are not consistent. If I take for instance Mt > Cleveland: > > > GNIS: 48.9250000 , -113.8480556 3175m (10417ft) > NPS: 48.9227541, -113.8472346 3190m (10466ft) > > That's a little bit more than 1/8 mile off horizontal and 50 ft off > vertical. Is there any other source of information to try and figure out > what is the correct data? > > Thanks, > > N. > > _______________________________________________ > Talk-us mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-us > _______________________________________________ Talk-us mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-us
