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Pardon for butting in...<br>
<br>
<div class="moz-cite-prefix">On 08/10/2018 04:45 PM, Rich Shepard
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:alpine.LNX.2.20.1808100641220.6491@salmo.appl-ecosys.com">On
Thu, 9 Aug 2018, Daniel Victoria wrote:
<br>
<br>
<blockquote type="cite">Try using v.to.db to add the coordinates
of each point to the attribute
<br>
table and then export it using DB.out.ogr.
<br>
</blockquote>
<br>
Daniel,
<br>
<br>
The points have an elevation -- in feet -- associated with the
geographic
<br>
location. Is there a grass module that will convert that attribute
table
<br>
column to meters (the location's lenth units)? Or, should I do
this on the
<br>
source data and re-import/re-project these data?
<br>
<br>
</blockquote>
If I understand, you have a vector of points with x,y and z in the
attribute table, and you want to transform to some different
coordinate system, while also transforming the elevation.<br>
<br>
In that case it might make sense to save the attribute table as an
ASCII (csv) file, then use v.in.ascii with the -z flag to create a
3D vector (pointing to the elev column as "z=...").<br>
Then when you transform to the new CRS, v.proj will also transform
the elevation. In the new LOCATION, add three new columns to the
vector: east,west,new_elev. Then use v.to.db to uploads the values
with the "option=coor" and "columns=east,north,new_elev".<br>
<br>
That should give you the new x coords, y_coords and new elevation.<br>
<br>
HTH<br>
<br>
<blockquote type="cite"
cite="mid:alpine.LNX.2.20.1808100641220.6491@salmo.appl-ecosys.com">Regards,
<br>
<br>
Rich
<br>
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<br>
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<br>
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<br>
<a class="moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/grass-user">https://lists.osgeo.org/mailman/listinfo/grass-user</a><br>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918</pre>
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