<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p><br>
</p>
<div class="moz-cite-prefix">Le 15/03/2024 à 06:27, Ulises Ibarra
via PROJ a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAP=Ak6jMWbpffcC7R+PXuv2BsynVdYRBCzTx00KySB-phocE8g@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Hello:<br>
I am trying to change the vertical datum of a LIDAR LAS file.
But first I must understand the syntax of proj, but I can't
understand it.<br>
<br>
If I use the following expression:<br>
echo 747194.732 2307402.892 2037.133 | proj +proj=vgridshift
+grids=C:/clouds/geoids/GGM10_GEO.gtx<br>
</div>
</blockquote>
<p>"proj" is a legacy tool only for 2D cartographic projections. You
want to use cct instead: <a class="moz-txt-link-freetext" href="https://proj.org/en/9.4/apps/cct.html">https://proj.org/en/9.4/apps/cct.html</a></p>
<span style="white-space: pre-wrap">
</span>
<pre class="moz-signature" cols="72">--
<a class="moz-txt-link-freetext" href="http://www.spatialys.com">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
</body>
</html>