[Tagging] Elevation and height on vertical features

Mike Thompson 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) [1], and it
mostly uses the North American Vertical Datum of 1988 [2]. 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[3]).

[1] http://nationalmap.gov/elevation.html
[2] http://www.usgs.gov/faq/categories/9865/4921
[3] http://www.ngs.noaa.gov/datasheets/


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