Even Rouault

I created https://github.com/OSGeoLabBp/eov2etrs/issues/4 to suggest contribution from the author of the above repository

Submitted in https://github.com/OSGeo/proj-datumgrid/pull/97

WARNING: This repository is no longer open for adding new datasets. Starting with PROJ 7, the [PROJ-data](https://github.com/OSGeo/PROJ-data) repository is the new home for PROJ datasets. Go to its [CONTRIBUTING](https://github.com/OSGeo/PROJ-data/blob/master/CONTRIBUTING.md) instructions

People at NRCan have been made aware about the lack of registration in EPSG for the transformation

WARNING: This repository is no longer open for adding new datasets. Starting with PROJ 7, the [PROJ-data](https://github.com/OSGeo/PROJ-data) repository is the new home for PROJ datasets. Go to its [CONTRIBUTING](https://github.com/OSGeo/PROJ-data/blob/master/CONTRIBUTING.md) instructions

@bstroebl Could the provider consider registering their grid to EPSG as I don't see it registered yet ? Quoting CONTRIBUTION.md "If the gris is not yet registered in the EPSG...

Another thing to check with the provider is the units of the accuracy values in the NTv2 file (since they provide non-zero values). As you can see in https://github.com/OSGeo/PROJ/wiki/Units-of-NTv2-accuracy-samples-%3F ,...

WARNING: This repository is no longer open for adding new datasets. Starting with PROJ 7, the [PROJ-data](https://github.com/OSGeo/PROJ-data) repository is the new home for PROJ datasets. Go to its [CONTRIBUTING](https://github.com/OSGeo/PROJ-data/blob/master/CONTRIBUTING.md) instructions

Link to the grid itself: https://www.geo.bremen.de/sixcms/media.php/13/HBTa2010.zip

WARNING: This repository is no longer open for adding new datasets. Starting with PROJ 7, the [PROJ-data](https://github.com/OSGeo/PROJ-data) repository is the new home for PROJ datasets. Go to its [CONTRIBUTING](https://github.com/OSGeo/PROJ-data/blob/master/CONTRIBUTING.md) instructions