[PROJ] Constant vertical offset

[Even Rouault]

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 
> <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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