[Talk-us] GNIS?

Thomas Colson thomas_colson at nps.gov
Sun Jun 16 23:42:47 UTC 2013


We're using Lidar (+/- 19 cm vertical precision) and/or OPUS GPS for
elevations of highest point as determined by zonal statistics, or the brass
disc found on many peaks. On that note, though, while preserving the tags,
if you modify the elevation, do you keep the GNIS source date?

 

From: Mike Thompson [mailto:miketho16 at gmail.com] 
Sent: Sunday, June 16, 2013 7:33 PM
To: Thomas Colson
Subject: Re: [Talk-us] GNIS?

 

I preserve the tags.  It is easy to do.

 

BTW, the reason the elevation of the GNIS mountain peaks is incorrect is
that GNIS takes the elevation from the National Elevation Dataset.  This is
a gridded dataset.  The value for any particular grid cell will generally
not be the same as any particular surveyed spot height within it.

 

Mike

 

On Sun, Jun 16, 2013 at 5:20 PM, Thomas Colson <thomas_colson at nps.gov>
wrote:

Is it preferable to keep the original GNIS tags if updating a GNIS object in
OSM? E.g. updating say the location and elevation, everything else is the
same. In context, GNIS mountain is here, but really it's there (which is
usually the case for GNIS).

Or, just leave the GNIS object alone, and add a new OSM feature? Not sure
how folks feel about GNIS.


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