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    <p>Those files use a invalid GeogEllipsoidGeoKey=4326 for the WGS 84
      ellipsoid. The correct code should be 7030. Sometimes should
      report that to the data producer.<br>
    </p>
    <p>Warning silenced in <a class="moz-txt-link-freetext" href="https://github.com/OSGeo/gdal/pull/4975">https://github.com/OSGeo/gdal/pull/4975</a><br>
    </p>
    <div class="moz-cite-prefix">Le 11/12/2021 à 00:05, Simon Eves a
      écrit :<br>
    </div>
    <blockquote type="cite"
cite="mid:CAJf0KTSAZZBQc1afLghw0FzcsRA4KjNrE=W7PtiCjTqKhXLbLw@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">After also finding this thread...
        <div><br>
        </div>
        <div>  <a href="https://github.com/OSGeo/gdal/issues/2321"
            moz-do-not-send="true">https://github.com/OSGeo/gdal/issues/2321</a><br>
        </div>
        <div><br>
        </div>
        <div>...I installed geotiff-bin and ran listgeo on the file.</div>
        <div><br>
        </div>
        <div>It also spits the same message (three times).</div>
        <div><br>
        </div>
        <div>The output is attached.</div>
        <div><br>
        </div>
        <div>S</div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Fri, Dec 10, 2021 at 2:56
          PM Simon Eves <<a href="mailto:simon.eves@omnisci.com"
            moz-do-not-send="true">simon.eves@omnisci.com</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 dir="ltr">Further to my earlier post about GCP
            Transforms, I now have that code written, and it seems to be
            functioning fine, although whether it's generating the right
            values is as yet unclear.
            <div><br>
            </div>
            <div>The problem is that I am having trouble creating the
              secondary transformation from whatever the output space of
              the GCP transform is, to my desired space (4326 in this
              case).<br clear="all">
              <div><br>
              </div>
              <div>Whenever I call GetGCPSpatialRef() on the datasource,
                I get the following error (twice)</div>
              <div><br>
              </div>
              <div>  PROJ: proj_create_from_database: ellipsoid not
                found (1)<br>
              </div>
              <div><br>
              </div>
              <div>I get the same error (also twice) when I run gdalinfo
                on the file, but then with a plausible looking SR dump,
                which may of course just be a default:</div>
              <div>______________________________________________________</div>
              <div><br>
              </div>
              <div>$ gdalinfo
                s1b-iw-grd-vv-20211110t033513-20211110t033538-029520-0385e8-001.tiff<br>
                ERROR 1: PROJ: proj_create_from_database: ellipsoid not
                found<br>
                ERROR 1: PROJ: proj_create_from_database: ellipsoid not
                found<br>
                Driver: GTiff/GeoTIFF<br>
                Files:
                s1b-iw-grd-vv-20211110t033513-20211110t033538-029520-0385e8-001.tiff<br>
                Size is 25541, 16650<br>
                GCP Projection = <br>
                GEOGCRS["WGS 84",<br>
                    DATUM["World Geodetic System 1984",<br>
                        ELLIPSOID["unnamed",6378137,298.25722356049,<br>
                            LENGTHUNIT["metre",1]]],<br>
                    PRIMEM["Greenwich",0,<br>
                        ANGLEUNIT["degree",0.0174532925199433]],<br>
                    CS[ellipsoidal,2],<br>
                        AXIS["geodetic latitude (Lat)",north,<br>
                            ORDER[1],<br>
                            ANGLEUNIT["degree",0.0174532925199433]],<br>
                        AXIS["geodetic longitude (Lon)",east,<br>
                            ORDER[2],<br>
                            ANGLEUNIT["degree",0.0174532925199433]],<br>
                    ID["EPSG",4326]]<br>
                Data axis to CRS axis mapping: 2,1<br>
                GCP[  0]: Id=1, Info=<br>
                          (0,0) ->
                (45.0323375081341,62.6475859336067,149.992539359257)<br>
              </div>
              <div>[etc.]</div>
              <div>
                <div>______________________________________________________</div>
                <div><br>
                </div>
              </div>
              <div>My constructed OGRCoordinateTransformation for the
                second transform is therefore a no-op, but the final
                values (which are therefore just the values out of the
                GCP transform) are definitely not 4326.</div>
              <div>
                <div>______________________________________________________</div>
                <div><br>
                </div>
              </div>
              <div>omnisql> select * from s1 where rowid<10;<br>
              </div>
              <div>raster_lon|raster_lat<br>
                476788.1263799404|747980.9704571336<br>
                460813.8583986053|747120.1413700345<br>
                444852.7791957706|746184.4282221086<br>
                428904.8887714364|745173.8310133558<br>
                412970.1871256025|744088.349743776<br>
                397048.6742582691|742927.9844133693<br>
                381140.3501694361|741692.7350221358<br>
                365245.2148591036|740382.6015700753<br>
                349363.2683272713|738997.5840571877<br>
                333494.5105739397|737537.6824834733<br>
              </div>
              <div>
                <div>______________________________________________________</div>
                <div><br>
                </div>
              </div>
              <div>Those are the first ten pixels of the first scanline
                of the (~25K x ~16K) file, btw, so intuitively there is
                something worrying me about those values anyway (they
                are moving very quickly and non-linearly considering
                that's just ten pixels).</div>
              <div><br>
              </div>
              <div>Anyway, some Googling led me to...</div>
              <div><br>
              </div>
              <div>  <a
                  href="https://gitlab.orfeo-toolbox.org/s1-tiling/s1tiling/-/issues/46"
                  target="_blank" moz-do-not-send="true">https://gitlab.orfeo-toolbox.org/s1-tiling/s1tiling/-/issues/46</a><br>
              </div>
              <div><br>
              </div>
              <div>...which seems very related, and even mentions a
                patch to libGeoTIFF by Even. I checked, and that patch
                IS in the (internal, as configured in the build) GeoTIFF
                in our GDAL.</div>
              <div><br>
              </div>
              <div>This is with GDAL 3.4.0 and Proj 7.2.1.</div>
              <div><br>
              </div>
              <div>Thanks in advance,</div>
              <div><br>
              </div>
              <div>Simon</div>
              <div><br>
              </div>
              -- <br>
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      <div><br>
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      -- <br>
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      <pre class="moz-quote-pre" wrap="">_______________________________________________
gdal-dev mailing list
<a class="moz-txt-link-abbreviated" href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a>
<a class="moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/gdal-dev">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a>
</pre>
    </blockquote>
    <pre class="moz-signature" cols="72">-- 
<a class="moz-txt-link-freetext" href="http://www.spatialys.com">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
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