[PROJ] What is the syntax for a vertical datum change?

[Even Rouault]

Le 22/03/2024 à 20:24, Ulises Ibarra via PROJ a écrit :
> Hello:
> Continuing with the attempt to change from ellipsoidal heights to 
> orthometric heights. I executed the instruction:
>
> echo 578174.247 3593725.312 1295.083 2010.0 | cct +proj=pipeline +step 
> +inv +proj=utm +zone=11 +ellps=WGS84 +step +proj=utm +zone=11 
> +ellps=WGS84 +proj=vgridshift +grids=/nubes/geoides/GGM10_GEO.gtx
>   578174.2470   3593725.3120     1295.0830     2010.0000

Steps 2 and 3 should be inverted, and here's a missing +step keyword. It 
should rather be something like

+proj=pipeline +step +inv +proj=utm +zone=11 +ellps=WGS84 +step 
+proj=vgridshift +grids=/nubes/geoides/GGM10_GEO.gtx +step +proj=utm 
+zone=11 +ellps=WGS84


Even

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