[PROJ] About Mexican Geoid

[Even Rouault]

The public domain nature is indeed probably at least true for the 
Mexico97 geoid as it's available from 
https://geodesy.noaa.gov/GEOID/MEXICO97/

And the xGEOID20 (although it doesn't seem the data available for 
download includes yet Mexico) also mentions Mexico (and has a contact 
information): https://geodesy.noaa.gov/web/news/xgeoid20-model.shtml

Some mentions of GGM10 in 
https://www.ngs.noaa.gov/web/science_edu/presentations_library/files/2011_07_04_progress_toward_unified_north_american_vertical_datum_-_iugg.pptx

Le 19/07/2021 à 16:26, Clifford J Mugnier a écrit :
> 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.
>
> Clifford J. Mugnier, c.p., c.m.s.
>
> Chief of Geodesy
>
> LSU Center for GeoInformatics (ERAD 266)
>
> Dept. of Civil Engineering (P.F. Taylor 3240H)
>
> *LOUISIANA STATE UNIVERSITY*
>
> Baton Rouge, LA  70803
>
> Academic: (225) 578-8536
>
> Research:   (225) 578-4578
>
> Cell:           (225) 328-8975
>
> honorary lifetime member, lsps
>
> fellow emeritus, asprs
>
> member, apsg
>
>
> ------------------------------------------------------------------------
> *From:* PROJ <proj-bounces at lists.osgeo.org> on behalf of Javier 
> Jimenez Shaw <j1 at jimenezshaw.com>
> *Sent:* Monday, July 19, 2021 3:43 AM
> *To:* proj <PROJ at lists.osgeo.org>
> *Subject:* [PROJ] About Mexican Geoid
> Hi
>
> Recently I found that Mexico has a geoid model, used with vcrs NAVD88: 
> GGM10 - Geoide gravimétrico mexicano 2010
> http://en.www.inegi.org.mx/temas/geoide/#Downloads 
> <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>
> The file is a text format, lat, long, undulation. It should be easy to 
> import.
> 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)
> 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).
>
> 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:
> http://en.www.inegi.org.mx/contenidos/inegi/doc/terminos_info_t.pdf 
> <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>
>
> What should we do?
> Maybe somebody already researched this geoid previously.
>
> Cheers,
> Javier.
>
> .___ ._ ..._ .. . ._.  .___ .. __ . _. . __..  ... .... ._ .__
> Entre dos pensamientos racionales
> hay infinitos pensamientos irracionales.
>
>
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