Investigate ItalyRome40ToWGS84_NTV2_GN.gsb and ItalyED50toWGS84_NTV2_GN.gsb

OSGeo / proj-datumgrid

Historic repository for proj datum grids. New developments are at https://github.com/OSGeo/PROJ-data

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Investigate ItalyRome40ToWGS84_NTV2_GN.gsb and ItalyED50toWGS84_NTV2_GN.gsb #85

Open agiudiceandrea opened 4 years ago

agiudiceandrea commented 4 years ago

Available at http://www.provincia.agrigento.it/flex/cm/pages/ServeBLOB.php/L/IT/IDPagina/309

The grids were created using the official conversion service made available by the Italian National Geoportal at http://www.pcn.minambiente.it/mattm/en/

rouault commented 4 years ago

I cannot find any reference in the EPSG database to a Roma40 datum or geographic CRS. Or is it the same as what EPSG calls EPSG:4265 "Monte Mario" ? I see the publication date of the Monte Mario datum is 1st January 1940
The grids are not referenced as transformations in the EPSG database. That would be desirable that the producer does it. Procedure described at http://www.epsg.org/EPSGDataset/Makechangerequest.aspx
What is the license of those grids ? One of those mentioned in https://github.com/OSGeo/proj-datumgrid#about-the-datum-grid-package would be required to consider inclusion

agiudiceandrea commented 4 years ago

The name "Roma40" in this case does refer to the EPSG:4265 "Monte Mario" (further info).

These NTv2 grids are supplied without particular limitations of use on the website of a local Italian Public administration. However, it seems no license type is explicitly specified, neither for the grids nor for the entire content of the website. I could try to contact the author to to ask him for clarifications about the user license.

rouault commented 4 years ago

I could try to contact the author to to ask him for clarifications about the user license.

You could suggest CC-BY-4.0 ( https://creativecommons.org/licenses/by/4.0/ ) if they don't know which license to adopt

rouault commented 4 years ago

WARNING: This repository is no longer open for adding new datasets. Starting with PROJ 7, the PROJ-data repository is the new home for PROJ datasets.

Go to its CONTRIBUTING instructions