[PROJ] proj grid not found

[Javier Jimenez Shaw]

Your file is projected (EPSG:5515) Is that working?
Looking at the documentation, it works only with geodetic coordinates
https://proj.org/en/stable/operations/transformations/hgridshift.html

Be careful, the axis order of the projection is southing-westing, to make
everything "easier".
https://spatialreference.org/ref/epsg/5515/


On Fri, 10 Jan 2025 at 22:06, Miroslav Pikl via PROJ <proj at lists.osgeo.org>
wrote:

> Hello,
>
> I need to prepare a grid file to transform some airborne data.
>
> I tried to follow description
>
> https://proj.org/en/stable/specifications/geodetictiffgrids.html#geodetictiffgrids
>
> and validated the grid with tool from
> https://github.com/OSGeo/PROJ-data/tree/master
>
> The grid file is placed in /usr/share/proj directory.
> But when I try to test the horizontal gridshift I get following error
>
> echo 5601804.80015816 6155138.44865926 291.032677173227 | cct -z0 -t0
> > +proj=hgridshift +grids=cz_jtsk.tif
> > proj_create: Error 1029 (File not found or invalid): hgridshift: could
> > not find required grid(s).
> > cct: Bad transformation arguments - (File not found or invalid)
> >      'cct -h' for help
>
> Other grid file from the same directory can be recognized.
>
> Is it possible to indicate why the grid is not recognized?
> The grid file is accessible from
> cz_jtsk.tif
> <https://uvgz-my.sharepoint.com/:i:/g/personal/pikl_m_czechglobe_cz/EWbKrKo-qRpOqBVPL8_1a1kBJKEnOQozCGyqpuPGYXos8Q?e=E2sd0j>
>
> Thank you very much.
> Miroslav
>
>
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