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:[email protected]] 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 <[email protected]> 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. _______________________________________________ Talk-us mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-us
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