<div dir="ltr"><div><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">Hi,</span></span></span></div><div><span class="gmail-HwtZe" lang="en"><br></span></div><div><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">  I think that it is the main canvas trying to reproject all layers to a common (</span></span></span><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">but not related to any Earth's)</span></span></span><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb"> CRS.</span></span><span class="gmail-jCAhz"><span class="gmail-ryNqvb">  </span></span></span><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">As if the datum transformations between these systems were not defined, and the absence of the WGS-84 pivot was insurmountable.</span></span></span></div><div><span class="gmail-HwtZe" lang="en"><br></span></div><div><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">  In my opinion, the most convenient thing to do is to disable the "on-the-fly" projection of the main map. In the project properties, CRS tab, checking the option: "No CRS (or unknown/non-Earth projection)".</span></span></span></div><div><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb"><br></span></span></span></div><div><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">  </span></span></span><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">In this way, the canvas becomes a kind of "universal-unitless 2D Cartesian system".</span></span> <span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">All the geometries of the layers will be displayed in the coordinates that are stored in their vertices, and the rasters according to their matrices of geotransform. </span></span></span><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">In fact, it can contribute to a better understanding of coordinate reference systems.</span></span></span></div><div><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb"><br></span></span></span></div><div><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">  </span></span></span><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">The only things that are disabled are on-the-fly reprojection on the main map and maybe ellipsoidal measurements. All other functionalities must be available.<br></span></span></span></div><div><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb"><br></span></span></span></div><div><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb"><br></span></span></span></div><div><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">Regards,</span></span></span></div><div><span class="gmail-HwtZe" lang="en"><span class="gmail-jCAhz gmail-ChMk0b"><span class="gmail-ryNqvb">Gabriel<br></span></span></span></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">El vie, 10 nov 2023 a la(s) 18:49, Diaz, Tony A. via QGIS-User (<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>) escribió:<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="msg2224707652821924934">





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<p class="MsoNormal">I’m trying to help a student understand projections and trying to load in a Venus global map data. When they try to align different maps with the same projection, or even change projection, a consistent error message  "No transform available
 between XXXX and Custom CRS” keeps occurring. <u></u><u></u></p>
<p class="MsoNormal">Any tips or ideas would be helpful,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Tony<u></u><u></u></p>
<p class="MsoNormal">Caltech<u></u><u></u></p>
<p class="MsoNormal">Pasadena, CA<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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