[PROJ] Constant vertical offset

[Javier Jimenez Shaw]

Thanks Even

Is there anything equivalent to that as Vertical CRS to use in a Compound?
I know it is not correct geodetically, but I want it just as a WKT
temporary object. I just need that PROJ is able to understand it and use it
in a transformation.
That is, given a horizontal CRS, I want to create a compound (or anything
equivalent) with a vertical offset (as WKT2 if it makes things easier)

Thanks.
.___ ._ ..._ .. . ._.  .___ .. __ . _. . __..  ... .... ._ .__
Entre dos pensamientos racionales
hay infinitos pensamientos irracionales.



On Mon, 1 Nov 2021 at 17:01, Even Rouault <even.rouault at spatialys.com>
wrote:

> Javier
> Le 01/11/2021 à 13:32, Javier Jimenez Shaw a écrit :
>
> Hi
>
> I want to make a transformation (at the end an
> operation::CoordinateOperation) that replaces the geoid model with a local
> constant value.
>
> 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.
>
> How can I do that? is there any pipeline option for that? (I do not see a
> way in https://proj.org/operations/transformations/vgridshift.html) Or a
> way to directly create the CoordinateOperation?
>
> You can use the
> https://proj.org/operations/transformations/geogoffset.html with the dh
> parameter. This is for example used for transformation EPSG:15596
>
> Even
>
>
> Thanks
> .___ ._ ..._ .. . ._.  .___ .. __ . _. . __..  ... .... ._ .__
> Entre dos pensamientos racionales
> hay infinitos pensamientos irracionales.
>
>
> _______________________________________________
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>
> -- http://www.spatialys.com
> My software is free, but my time generally not.
>
>
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