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<p>Sebastian,</p>
<p>I can reproduce the 2 error messages you got. There's indeed something in QGIS that tries a terrestrial reprojection and should be fixed, but I don't think this is really critical apart of the annoyance of being spammed about that. Please file a QGIS issue to track this. That said, I managed to do a non-Earth reprojection by adding a custom CRS with the following WKT definition:</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
GEOGCRS["MARS Geographic",</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> DATUM["D_MARS",</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> ELLIPSOID["MARS",3396000,0,</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> LENGTHUNIT["metre",1,</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> ID["EPSG",9001]]]],</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> PRIMEM["Reference meridian",0,</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> ANGLEUNIT["degree",0.0174532925199433,</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> ID["EPSG",9122]]],</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> CS[ellipsoidal,2],</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> AXIS["longitude",east,</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> ORDER[1],</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> ANGLEUNIT["degree",0.0174532925199433,</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> ID["EPSG",9122]]],</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> AXIS["latitude",north,</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> ORDER[2],</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> ANGLEUNIT["degree",0.0174532925199433,</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"> ID["EPSG",9122]]]]</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">and selecting it as the project CRS. Using ESRI:104905 (GCS_Mars_2000) seems to also work (I haven't deeply checked but I do get a reprojected raster and geographic coordinates), but you'll get each time the warnings about the 2 terrestrial coordinate operations. Hopefully in coming months, I'll be able to ingest the IAU catalog into the PROJ database as well.</p>
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</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Even
</p>
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<div class="moz-cite-prefix">Le 18/03/2021 à 21:07, Sebastian Walter
a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:6f398ddd-2e7e-045d-568a-0ff2ccbcf84c@fu-berlin.de">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<p>Hi,</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Since Version 3.X I'm not able to perform transformations on planetary (non-Earth) data (from e.g. Mars or Mercury, example dataset: <a class="moz-txt-link-freetext" href="https://maps.planet.fu-berlin.de/mex4/h1104_0000.ihs.53.tif" moz-do-not-send="true">https://maps.planet.fu-berlin.de/mex4/h1104_0000.ihs.53.tif</a>). The error message is:
</p>
<font face="monospace">No transform is available between <span
style=" font-style:italic;">SINUSOIDAL MARS</span> and <span
style=" font-style:italic;">Custom CRS:
GEOGCRS["unknown",DATUM["unknown",ELLIPSOID["WGS 8…</span>.</font><br>
<font face="monospace">proj_create_operations: Source and target
ellipsoid do not belong to the same celestial body </font><br>
<font face="monospace">No transform available between SINUSOIDAL
MARS and EPSG:4326</font>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">The consequence is that transformations to lat/lon are not possible any more. With the older QGis there was no problem like this. My suspect is the "new" Proj6 database layout, but the above error messages also point to the fact there there is some EPSG:4326 projection hard-coded into Qgis.</p>
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</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Is anybody successfully using Qgis with non-Earth data and proper transformations?</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Thanks for any advise...</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Sebastian
</p>
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<br>
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