[PROJ] proj grid not found

[Miroslav Pikl]

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
[https://res.cdn.office.net/assets/mail/file-icon/png/photo_16x16.png]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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