<div dir="ltr"><div style><font color="#000000" face="sans-serif"><span style="line-height:19.1875px">The wiki (</span></font><a href="http://wiki.openstreetmap.org/wiki/GNIS">http://wiki.openstreetmap.org/wiki/GNIS</a>) doesn't mention "source date", but it does mention: </div>
<ul style="line-height:19.1875px;list-style-type:square;margin:0.3em 0px 0px 1.6em;padding:0px;color:rgb(0,0,0);font-family:sans-serif;font-size:13px"><li style="margin-bottom:0.1em">gnis:created = <i>MM/DD/YYYY when the GNIS entry was created </i></li>
</ul><div><font color="#000000" face="sans-serif"><span style="line-height:19.1875px"><i><br></i></span></font></div><div style><font color="#000000" face="sans-serif"><span style="line-height:19.1875px">I presume that "source date" is the date of the export from the GNIS which was then imported to OSM. Might be useful if someone wants to compare OSM to GNIS in the future as the two sources will diverge over time. </span></font></div>
<div style><font color="#000000" face="sans-serif"><span style="line-height:19.1875px"><br></span></font></div><div style><font color="#000000" face="sans-serif"><span style="line-height:19.1875px">BTW, for most peaks are there not "official" elevations?</span></font></div>
<div style><font color="#000000" face="sans-serif"><span style="line-height:19.1875px"><br></span></font></div><div style><font color="#000000" face="sans-serif"><span style="line-height:19.1875px">Mike</span></font></div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sun, Jun 16, 2013 at 5:42 PM, Thomas Colson <span dir="ltr"><<a href="mailto:thomas_colson@nps.gov" target="_blank">thomas_colson@nps.gov</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">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?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Mike Thompson [mailto:<a href="mailto:miketho16@gmail.com" target="_blank">miketho16@gmail.com</a>] <br>
<b>Sent:</b> Sunday, June 16, 2013 7:33 PM<br><b>To:</b> Thomas Colson<br><b>Subject:</b> Re: [Talk-us] GNIS?<u></u><u></u></span></p><div><div class="h5"><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">
I preserve the tags. It is easy to do.<u></u><u></u></p><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">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.<u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Mike<u></u><u></u></p></div></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p><div><p class="MsoNormal">On Sun, Jun 16, 2013 at 5:20 PM, Thomas Colson <<a href="mailto:thomas_colson@nps.gov" target="_blank">thomas_colson@nps.gov</a>> wrote:<u></u><u></u></p>
<p class="MsoNormal">Is it preferable to keep the original GNIS tags if updating a GNIS object in<br>OSM? E.g. updating say the location and elevation, everything else is the<br>same. In context, GNIS mountain is here, but really it's there (which is<br>
usually the case for GNIS).<br><br>Or, just leave the GNIS object alone, and add a new OSM feature? Not sure<br>how folks feel about GNIS.<br><br><br>_______________________________________________<br>Talk-us mailing list<br>
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