Many thanks, that makes sense, and it solves my problem. ---Andrew
On Mon, May 27, 2024 at 11:42 AM Even Rouault <[email protected]> wrote: > Andrew, > > The error you get is related to the fact that you can't formally transform > coordinates between 2 vertical CRS, without specifying the "horizontal" / > geographic CRS into which you enter the long, lat. > > Here you, very likely, should combine them with EPSG:4312 "MGI" which is > the CRS into which the at_bev_GV_Hoehengrid_V1.tif grid is registered to > > So: > > $ echo 46.642970 12.792060 2513.98 | PROJ_NETWORK=ON bin/cs2cs -d 8 > EPSG:4312+9274 EPSG:4312+5778 > 46.64297000 12.79206000 2514.15224077 > > Note that I've specified a latitude, longitude order as EPSG:4312 is > defined with axis in that order > > Even > Le 27/05/2024 à 20:27, Andrew Kirmse via PROJ a écrit : > > I have some Lidar-derived lat/lng/elevation points in Austria in EPSG:9274 > <https://epsg.io/9274> that I want to convert to EPSG:5778 > <https://epsg.io/5778>. I gather this is done by applying the offsets > from a particular model called the "Höhengrid", which I found at > https://cdn.proj.org/. These points are locations and heights of > mountains, and I want to convert them to EPSG:5778 because that's what's > used on the BEV Austrian topographic maps. > > I get this error when I try to do the conversion: > > echo 46.642970 12.792060 2513.98 | cs2cs +init=epsg:9274 +to > +init=epsg:5778 > DeprecationWarning: PROJ_LIB environment variable is deprecated, and will > be removed in a future release. You are encouraged to set PROJ_DATA instead. > proj_crs_get_geodetic_crs: CRS has no geodetic CRS > Rel. 9.3.1, December 1st, 2023 > <cs2cs>: > cannot initialize transformation > cause: Unknown error (code 4096) > program abnormally terminated > > What does "CRS has no geodetic CRS" mean, and how do I fix it? > > (Also, if anyone knows more about why these two different EPSGs exist, I > am curious. One is for maps and one is for "scientific purposes" but I > don't know what that means in practice.) > > ---Andrew > > _______________________________________________ > PROJ mailing > [email protected]https://lists.osgeo.org/mailman/listinfo/proj > > -- http://www.spatialys.com > My software is free, but my time generally not. > >
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