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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Alain,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">See the FAQ [0] for an answer to your question about axis ordering. In short, everything works as intended but for historical reasons it seems a bit weird.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">/Kristian<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">[0] <a href="https://proj.org/faq.html#why-is-the-axis-ordering-in-proj-not-consistent">
https://proj.org/faq.html#why-is-the-axis-ordering-in-proj-not-consistent</a> <o:p>
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<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> PROJ <proj-bounces@lists.osgeo.org>
<b>On Behalf Of </b>Alain Orsoni<br>
<b>Sent:</b> 14. april 2023 08:29<br>
<b>To:</b> PROJ@lists.osgeo.org<br>
<b>Subject:</b> [PROJ] Coordinates in Lat/Lon or Lon/Lat<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hello,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Basic question but necessary for me :<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">We use PROJ Version 8.2.1<o:p></o:p></p>
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<p class="MsoNormal">Exemple : I convert from Longitude=10 Latitude=70 from 4326 to UPS stereo North Pole (5041)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo",serif">projinfo -s EPSG:4326 -t EPSG:5041 -o PROJ<o:p></o:p></span></p>
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<p class="MsoNormal">Gives output :<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo",serif">+proj=pipeline<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo",serif"> +step +proj=axisswap +order=2,1<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo",serif"> +step +proj=unitconvert +xy_in=deg +xy_out=rad<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo",serif"> +step +proj=stere +lat_0=90 +lon_0=0 +k=0.994 +x_0=2000000 +y_0=2000000<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo",serif"> +ellps=WGS84<o:p></o:p></span></p>
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<br>
<o:p></o:p></p>
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<p class="MsoNormal">But<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Menlo",serif">echo "10 70 0" | cs2cs EPSG:4326 EPSG:5041<o:p></o:p></span></p>
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<br>
<o:p></o:p></p>
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<p class="MsoNormal">Gives output : <span style="font-size:8.5pt;font-family:"Menlo",serif">11976062.58<span class="apple-tab-span">
</span>-1630989.83 0.00</span><o:p></o:p></p>
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<p class="MsoNormal">The good result given by EPSG.IO is : <span style="font-size:8.5pt;font-family:"Menlo",serif">2389386.90<span class="apple-tab-span">
</span>-208322.83 0.00</span><o:p></o:p></p>
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<p class="MsoNormal">I get the good result with : <span style="font-size:8.5pt;font-family:"Menlo",serif">echo « 70 10 0" | cs2cs EPSG:4326 EPSG:5041</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">So it seems that the syntax. <span style="font-size:8.5pt;font-family:"Menlo",serif">cs2cs EPSG:4326 EPSG:5041</span> doesn’t apply the step axisswap <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Can someone confirm this behavior ?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Second question : <o:p></o:p></p>
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<p class="MsoNormal">In C++ API the proj_create_crs_to_crs() associated to proj_normalize_for_visualization() allows to avoid this problem.<o:p></o:p></p>
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<p class="MsoNormal">But we use also PROJ in shell scripts. It seems to me that some geodetic_crs expect lat-lon entry and some other Lon-lat.<o:p></o:p></p>
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<p class="MsoNormal">Is there a way in the SQL database (proj.db) to find this information?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks for any answer.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Alain<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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