[Talk-us] Peaks
Mike Thompson
miketho16 at gmail.com
Sat Oct 23 15:46:08 BST 2010
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 <nakor.osm at gmail.com> 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
> Talk-us at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/talk-us
>
More information about the Talk-us
mailing list