<div dir="ltr"><div>Your file is projected (EPSG:5515) Is that working?</div><div>Looking at the documentation, it works only with geodetic coordinates</div><div><a href="https://proj.org/en/stable/operations/transformations/hgridshift.html">https://proj.org/en/stable/operations/transformations/hgridshift.html</a></div><div><br></div><div>Be careful, the axis order of the projection is southing-westing, to make everything "easier".<br><a href="https://spatialreference.org/ref/epsg/5515/">https://spatialreference.org/ref/epsg/5515/</a></div><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Fri, 10 Jan 2025 at 22:06, Miroslav Pikl via PROJ <<a href="mailto:proj@lists.osgeo.org">proj@lists.osgeo.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-4982232122141201015">




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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="m_-4982232122141201015LPlnkOWAdd3d8d1f-12e7-9866-9baf-a513462b313b" style="margin:0px;background-color:rgb(255,255,255);text-align:left" target="_blank">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="m_-4982232122141201015LPlnk" target="_blank">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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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 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="m_-4982232122141201015OLK_Beautified_OWA700b5f9e-85a3-ab6c-1596-fde8f787c086" style="padding:0px 1px;border-radius:2px;background-color:rgb(243,242,241)" target="_blank"><img alt="" role="presentation" style="width: 16px; height: 16px; vertical-align: middle; padding: 1px 2px 2px 0px;">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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