PROJ.4 datum grids are missing

[edzer]

To convert to and from national grids (datums), PROJ.4 needs to have the grid definitions. These are currently not part of this distribution. They are part of the rgdal package, so need to get in here too. The grids are found in this file:

http://download.osgeo.org/proj/proj-datumgrid-1.6.zip

and need to be unpacked in directory gdal2-2.1.1/share/proj/

In future builds of this package, before configuring PROJ.4 this file should be unpacked in the proj-x.y.z/nad directory (x.y.z now being 4.9.3), installing PROJ.4 would copy over the files to the right place.

[jeroen]

Can you send a PR?

[edzer]

Done!

[jeroen]

OK it's merged. I also moved the v2.1.1 tag to HEAD so that you can keep using the same download URL.

[edzer]

I checked and everything worked out for sf 0.2-7 on CRAN, and appveyor. Thanks, Jeroen!

[jeroen]

Good to know, thanks.

[edzer]

The files I added in https://github.com/rwinlib/gdal2/commit/43f7368d616be4699f744970445c6a8ce9750448 are again missing from share/proj. Shall I add them in a new PR?

[jeroen]

@edzer ah that explains it, i'm sorry. Are these files not included with proj? The build script just replaced the entire /share/proj dir with the latest one I guess.

[jeroen]

@edzer I have re-applied your commit to head. Can you try to trigger a rebuild of sf ?

[edzer]

Thanks, will do!

@rsbivand I'm not sure now whether we should copy over the old files (like conus) or those in http://download.osgeo.org/proj/proj-datumgrid-1.5.zip which all have the .lla extension (conus.lla).

[edzer]

@jeroen this worked out!

[jeroen]

So everything is good now? I still see some diff's in the check but those are expected?

[edzer]

Yes, these diffs are all expected.