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<div class="moz-cite-prefix">On 08/10/2018 05:45 PM, Rich Shepard
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:alpine.LNX.2.20.1808100733170.6491@salmo.appl-ecosys.com">On
Fri, 10 Aug 2018, Micha Silver wrote:
<br>
<br>
<blockquote type="cite">If I understand, you have a vector of
points with x,y and z in the
<br>
attribute table, and you want to transform to some different
coordinate
<br>
system, while also transforming the elevation.
<br>
</blockquote>
<br>
I must not yet be sufficiently cafinated this morning. When I
look again
<br>
at the input and v.out.ogr files I now see that I had transformed
the
<br>
elevation column to meters when my gawk script extracted columns
from the
<br>
source data.
<br>
<br>
</blockquote>
<br>
I was trying to point out that, regardless if the units are meters
or feet, when you transform to a different CRS, you change all three
values of the location, x,y <b>and</b> z. <br>
For example:<br>
<br>
<tt>micha@TP480:~$ echo "35.3 30.8 -180" | cs2cs +init=epsg:4326 +to
+init=epsg:2039</tt><tt><br>
</tt><tt>228595.08 523262.05 -200.28</tt><tt> <br>
<br>
<br>
</tt>In the EPSG 2039 CRS my elevation has "dropped" by 20 meters
(!) compared to WGS84<br>
<br>
Cheers<br>
<br>
<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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