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Hello,</div>
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I need to prepare a grid file to transform some airborne data.</div>
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I tried to follow description</div>
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<span style="background-color: rgb(255, 255, 255);"><a href="https://proj.org/en/stable/specifications/geodetictiffgrids.html#geodetictiffgrids" id="LPlnkOWAdd3d8d1f-12e7-9866-9baf-a513462b313b" class="OWAAutoLink" style="margin: 0px; background-color: rgb(255, 255, 255); text-align: left;">https://proj.org/en/stable/specifications/geodetictiffgrids.html#geodetictiffgrids</a></span></div>
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and validated the grid with tool from </div>
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<a href="https://github.com/OSGeo/PROJ-data/tree/master" id="LPlnk" class="OWAAutoLink">https://github.com/OSGeo/PROJ-data/tree/master</a></div>
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The grid file is placed in /usr/share/proj directory.</div>
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But when I try to test the horizontal gridshift I get following error</div>
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echo 5601804.80015816 6155138.44865926 291.032677173227 | cct -z0 -t0<br>
> +proj=hgridshift +grids=cz_jtsk.tif<br>
> proj_create: Error 1029 (File not found or invalid): hgridshift: could<br>
> not find required grid(s).<br>
> cct: Bad transformation arguments - (File not found or invalid)<br>
> 'cct -h' for help</div>
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<br>
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Other grid file from the same directory can be recognized.</div>
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Is it possible to indicate why the grid is not recognized?</div>
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The grid file is accessible from</div>
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<span class="_Entity _EType_OWALink _EId_OWALink _EReadonly_1" style="display: inline-block;"><span><a href="https://uvgz-my.sharepoint.com/:i:/g/personal/pikl_m_czechglobe_cz/EWbKrKo-qRpOqBVPL8_1a1kBJKEnOQozCGyqpuPGYXos8Q?e=E2sd0j" rel="noopener noreferrer" id="OLK_Beautified_OWA700b5f9e-85a3-ab6c-1596-fde8f787c086" class="OWAAutoLink eScj0 none" style="pointer-events: auto; padding: 0px 1px; border-radius: 2px; background-color: rgb(243, 242, 241);" data-ogsc="" data-loopstyle="linkonly"><img class="suRDx" alt="" role="presentation" style="width: 16px; height: 16px; vertical-align: middle; padding: 1px 2px 2px 0px;" src="https://res.cdn.office.net/assets/mail/file-icon/png/photo_16x16.png">cz_jtsk.tif</a></span></span></div>
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Thank you very much.</div>
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Miroslav</div>
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