[PROJ] Interested in helping for inclusion of grids for Spain, Austria, Slovakia, Brazil ?

[Even Rouault]

Hi,

I'm requesting help from good wills of the community to help us grow our datasets of grids at
https://github.com/OSGeo/proj-datumgrid/
Below a few candidates I've identified, mentionned in EPSG and with a number of them with
download links, but license clarification would be needed.

Community members from those countries are probably in a better position than me to
connect with the relevant authority and see if they'd be willing to adopt one of the licenses
mentionned at https://github.com/OSGeo/proj-datumgrid#about-the-datum-grid-package

Spain
-----

* Peninsula and Baleares:

Anyone from the Spanish community to help clarifying license of
https://www.fomento.gob.es/recursos_mfom/gridshift1.zip (ED50 to ETRS89),
presumably whith IGN Spain

The download link is accessible from
https://www.fomento.gob.es/organos-colegiados/consejo-superior-geografico/csg/etrs89/etrs89-nuevo-sistema-de-referencia-geodesico-oficial-en-espana

This file has a sort of CC license
(https://gist.github.com/rouault/1ff4ad2d8053e068f9dbf451572692f4) but with a
annoying non-modification clause that makes it incompatible with our requirements
(we might want to transform it to another format like GeoTIFF),
and no version/link to the actual CC license.

* Catalonia:

Grid specific to Catalonia for ED50 to ETRS89 : 100800401.gsb
File found in http://www.icgc.cat/content/download/48766/337962/version/1/file/Malla_NTv2_11_03.zip 
but no explicit license mention.
https://www.icgc.cat/en/Web/Help/Legal-notice has a vague mention of Creative Commons,
but no precise identification of which variant of it, and which version.

Austria
-------

The AT_GIS_GRID.gsb grid for MGI to ETRS89 is available at
http://www.bev.gv.at/portal/page?_pageid=713,2157075&_dad=portal&_schema=PORTAL :

http://www.bev.gv.at/pls/portal/docs/PAGE/BEV_PORTAL_CONTENT_ALLGEMEIN/0200_PRODUKTE/UNENTGELTLICHE_PRODUKTE_DES_BEV/GIS-Grid.zip

Copyright info I could find is
"Hinsichtlich seiner Datenbanken verfügt das BEV über das ausschließliche
Werknutzungsrecht gemäß §§ 40f bis 40h UrhG und das sui generis-Recht gemäß §§ 76c bis 76e UrhG."

which by itself is not super promising.

Slovakia
--------

https://www.geoportal.sk/en/geodeticke-zaklady/download/ offers for download 3 grids
referenced by EPSG:
Slovakia_ETRS89h_to_Baltic1957.gtx
Slovakia_ETRS89h_to_EVRF2007.gtx
Slovakia_JTSK03_to_JTSK.LAS / .LOS

I've emailed the contact mentionned on the site to get info regarding the license.
But wouldn't hurt to get feedback of knowledgeable people too.

Brazil
------

Looking for official download links & license for the following:

Corrego Alegre 1961 to SIRGAS 2000: CA61_003.gsb
Corrego Alegre 1970-72 to SIRGAS 2000: CA7072_003.gsb
SAD69 to SIRGAS 2000: SAD69_003.gsb
SAD69(96) to SIRGAS 2000: SAD96_003.gsb

https://www.killetsoft.de/p_gdln_e.htm has download links but official ones from IBGE
would be preferable if possible.


Of course there are certainly gaps to fill for other countries I've not mentionned...

Even

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