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 But there is no change in heights. Could you tell me what I'm doing wrong, please? The file GGM10_GEO.gtx is the Mexican Gravimetric Geoid of 2010. I don't know what the current era of the ellipsoid would be, for this reason I assumed one: 2010.0 El vie, 15 mar 2024 a las 10:51, Ulises Ibarra (< ulisesmartiniba...@gmail.com>) escribió: > Mr. Even, thanks You very much. > > El vie, 15 de mar de 2024, 1:42 a. m., Even Rouault < > even.roua...@spatialys.com> escribió: > >> >> Le 15/03/2024 à 06:27, Ulises Ibarra via PROJ a écrit : >> >> Hello: >> I am trying to change the vertical datum of a LIDAR LAS file. But first I >> must understand the syntax of proj, but I can't understand it. >> >> If I use the following expression: >> echo 747194.732 2307402.892 2037.133 | proj +proj=vgridshift >> +grids=C:/clouds/geoids/GGM10_GEO.gtx >> >> "proj" is a legacy tool only for 2D cartographic projections. You want to >> use cct instead: https://proj.org/en/9.4/apps/cct.html >> >> -- http://www.spatialys.com >> My software is free, but my time generally not. >> >>
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