[Tagging] Elevation and height on vertical features
miketho16 at gmail.com
Fri Jan 8 17:11:37 UTC 2016
On Fri, Jan 8, 2016 at 9:47 AM, Colin Smale <colin.smale at xs4all.nl> wrote:
> How did all the elevation data get into OSM in the first place?
The elevations of peaks in the US came from the GNIS import. In turn the
GNIS elevations came from the National Elevation Dataset (NED) , and it
mostly uses the North American Vertical Datum of 1988 . The other
problem is that these are not "spot elevations" and therefore the elevation
of a peak in the GNIS does not - in most cases - match the official
elevation (the ones shown on the old USGS Topo maps and published by the
National Geodetic Survey).
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