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

[Ulises Ibarra]

Thank you very much Even, it seems to work perfectly:

echo 578174.247 3593725.312 1295.083 2010.0 | cct +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
  578174.2470   3593725.3120     1329.6219     2010.0000

Ulises

El vie, 22 mar 2024 a las 13:30, Even Rouault (<even.rouault at spatialys.com>)
escribió:

>
> 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
>
> -- http://www.spatialys.com
> My software is free, but my time generally not.
>
>
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