[PROJ] About Mexican Geoid

[Clifford J Mugnier]

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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