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<p>Javier<br>
</p>
<div class="moz-cite-prefix">Le 01/11/2021 à 13:32, Javier Jimenez
Shaw a écrit :<br>
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cite="mid:CADRrdKuPT09gdiZqpmfUugJ5o1ysMjg7XGYG4vTN8Sh+6U3kEA@mail.gmail.com">
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<div>Hi</div>
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<div>I want to make a transformation (at the end an
operation::CoordinateOperation) that replaces the geoid model
with a local constant value.</div>
<div><br>
</div>
<div>In some cases there is public grid file for a geoid model,
but I can get a (constant) undulation value (let's say 42.9m)
in a (small) area of work. I would like to include this
undulation value in the transformation.</div>
<div><br>
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<div>How can I do that? is there any pipeline option for that?
(I do not see a way in <a
href="https://proj.org/operations/transformations/vgridshift.html"
moz-do-not-send="true">https://proj.org/operations/transformations/vgridshift.html</a>)
Or a way to directly create the CoordinateOperation?</div>
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<p>You can use the
<a class="moz-txt-link-freetext" href="https://proj.org/operations/transformations/geogoffset.html">https://proj.org/operations/transformations/geogoffset.html</a> with
the dh parameter. This is for example used for transformation
EPSG:15596<br>
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<p>Even<br>
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cite="mid:CADRrdKuPT09gdiZqpmfUugJ5o1ysMjg7XGYG4vTN8Sh+6U3kEA@mail.gmail.com">
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<div>Thanks<br>
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<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">.___ ._ ..._ .. . ._.
.___ .. __ . _. . __.. ... .... ._ .__<br>
Entre dos pensamientos racionales <br>
hay infinitos pensamientos irracionales.<br>
<br>
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<pre class="moz-signature" cols="72">--
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My software is free, but my time generally not.</pre>
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