[Talk-us] Maxweight in the USA

Mike Thompson miketho16 at gmail.com
Mon Nov 2 23:12:42 UTC 2015

On Mon, Nov 2, 2015 at 3:12 PM, Steve Friedl <steve at unixwiz.net> wrote:

> This issue has come up as well with the height of mountain peaks; those of
> us who hike in the mountains in the US know peak heights *only* in feet,
> but OSM seems to reflect this in meters; this is entirely unhelpful to
> local hikers.  Us locals think of Sierra Peak as 4050 feet, not 928 meters.
> The discussion was strictly informal, but I think a number of us liked the
> idea to support a unit of measure, such as ele=4050ft or maxweight=10t
There are a couple of different issues with mountain elevations in the US.
One - feet vs meters - Steve explained well.  One other is the fact that
many of the peak elevations in OSM in the US came from the GNIS import.
The elevation values in the GNIS are not spot or surveyed elevations. The
elevations in the GNIS are from the US National Elevation Dataset (NED).
The NED is a gridded dataset and the elevation is only typically for that
given grid cell, which may be as large as 30 x 30 meters.

For example, Longs Peak in Colorado is officially 14,259 feet above sea
level[1], but OSM shows it as 4340 meters [2], which is 14,239 feet.

[1] http://www.ngs.noaa.gov/cgi-bin/ds_desig.prl

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