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    <p>The public domain nature is indeed probably at least true for the
      Mexico97 geoid as it's available from
      <a class="moz-txt-link-freetext" href="https://geodesy.noaa.gov/GEOID/MEXICO97/">https://geodesy.noaa.gov/GEOID/MEXICO97/</a></p>
    <p>And the xGEOID20 (although it doesn't seem the data available for
      download includes yet Mexico) also mentions Mexico (and has a
      contact information):
      <a class="moz-txt-link-freetext" href="https://geodesy.noaa.gov/web/news/xgeoid20-model.shtml">https://geodesy.noaa.gov/web/news/xgeoid20-model.shtml</a> <br>
    </p>
    <p>Some mentions of GGM10 in
<a class="moz-txt-link-freetext" href="https://www.ngs.noaa.gov/web/science_edu/presentations_library/files/2011_07_04_progress_toward_unified_north_american_vertical_datum_-_iugg.pptx">https://www.ngs.noaa.gov/web/science_edu/presentations_library/files/2011_07_04_progress_toward_unified_north_american_vertical_datum_-_iugg.pptx</a><br>
    </p>
    <div class="moz-cite-prefix">Le 19/07/2021 à 16:26, Clifford J
      Mugnier a écrit :<br>
    </div>
    <blockquote type="cite"
cite="mid:DM6PR06MB50027DDCA065F2963747F105A8E19@DM6PR06MB5002.namprd06.prod.outlook.com">
      <div>
        If my memory serves me correctly, the U.S. National Geodetic
        Survey (NGS) computed the Mexican geoid.  Dr. Tomas Soler was
        involved as I recall who is/was the Senior Geodesist at NGS.  I
        think it's public domain.</div>
      <div>
        <div>
          <br>
        </div>
        <div id="Signature">
          <div>
            <div>
              <p>Clifford J. Mugnier, c.p., c.m.s.</p>
              <p>Chief of Geodesy</p>
              <p>LSU Center for GeoInformatics (ERAD 266)</p>
              <p>Dept. of Civil Engineering (P.F. Taylor 3240H)</p>
              <p><b>LOUISIANA STATE UNIVERSITY</b></p>
              <p>Baton Rouge, LA  70803</p>
              <p>Academic: (225) 578-8536</p>
              <p>Research:   (225) 578-4578</p>
              <p>Cell:           (225) 328-8975</p>
              <p>honorary lifetime member, lsps</p>
              <p>fellow emeritus, asprs</p>
              <p>member, apsg</p>
            </div>
          </div>
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        <div>
          <br>
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        <hr tabindex="-1">
        <div id="divRplyFwdMsg" dir="ltr"><b>From:</b> PROJ
          <a class="moz-txt-link-rfc2396E" href="mailto:proj-bounces@lists.osgeo.org"><proj-bounces@lists.osgeo.org></a> on behalf of Javier
          Jimenez Shaw <a class="moz-txt-link-rfc2396E" href="mailto:j1@jimenezshaw.com"><j1@jimenezshaw.com></a><br>
          <b>Sent:</b> Monday, July 19, 2021 3:43 AM<br>
          <b>To:</b> proj <a class="moz-txt-link-rfc2396E" href="mailto:PROJ@lists.osgeo.org"><PROJ@lists.osgeo.org></a><br>
          <b>Subject:</b> [PROJ] About Mexican Geoid
          <div> </div>
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        <div>
          <div dir="ltr">
            <div>Hi</div>
            <div><br>
            </div>
            <div>Recently I found that Mexico has a geoid model, used
              with vcrs NAVD88: GGM10 - Geoide gravimétrico mexicano
              2010<br>
            </div>
            <div><a
href="https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fen.www.inegi.org.mx%2Ftemas%2Fgeoide%2F%23Downloads&data=04%7C01%7Ccjmce%40lsu.edu%7C21f6ad5c27544f9d08ac08d94a914bf1%7C2d4dad3f50ae47d983a09ae2b1f466f8%7C0%7C0%7C637622810781009658%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=dl22Hz7HsFb81wsjH0RLnIpDfjfXf7xMIz98nVxwoGQ%3D&reserved=0"
                moz-do-not-send="true">http://en.www.inegi.org.mx/temas/geoide/#Downloads</a></div>
            <div>The file is a text format, lat, long, undulation. It
              should be easy to import.</div>
            <div>The reference is ITRF2008 epoch 2010 (it sounds strange
              to me not using NAD83x, but it is fine, right?... well,
              epoch 2010 instead of 2005 may be a problem)</div>
            <div>Unfortunately I didn't find any transformation in EPSG
              from ITRF2008 (epoch 2010) to NAVD88. We should do a PROJ
              one for the database (or ask them to do in EPSG, but
              without much hope).<br>
            </div>
            <div><br>
            </div>
            <div>The main problem, as usual, is the "home made" license
              (for everything in their webpage). It seems to be very
              open, but it is not a "standard" one:<br>
            </div>
            <div><a
href="https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fen.www.inegi.org.mx%2Fcontenidos%2Finegi%2Fdoc%2Fterminos_info_t.pdf&data=04%7C01%7Ccjmce%40lsu.edu%7C21f6ad5c27544f9d08ac08d94a914bf1%7C2d4dad3f50ae47d983a09ae2b1f466f8%7C0%7C0%7C637622810781019648%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=f115p6f4ROTS8fr8IKTaV17gjrVCBph8bYGIIAQhHw0%3D&reserved=0"
                moz-do-not-send="true">http://en.www.inegi.org.mx/contenidos/inegi/doc/terminos_info_t.pdf</a></div>
            <div><br>
            </div>
            <div>What should we do?</div>
            <div>Maybe somebody already researched this geoid
              previously.</div>
            <div><br>
            </div>
            <div>Cheers,</div>
            <div>Javier.<br>
            </div>
            <div><br>
            </div>
            <div>
              <div>
                <div dir="ltr" class="x_gmail_signature">.___ ._ ..._ ..
                  . ._.  .___ .. __ . _. . __..  ... .... ._ .__<br>
                  Entre dos pensamientos racionales <br>
                  hay infinitos pensamientos irracionales.<br>
                  <br>
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      <pre class="moz-quote-pre" wrap="">_______________________________________________
PROJ mailing list
<a class="moz-txt-link-abbreviated" href="mailto:PROJ@lists.osgeo.org">PROJ@lists.osgeo.org</a>
<a class="moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/proj">https://lists.osgeo.org/mailman/listinfo/proj</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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