[Proj] https://github.com/OSGeo/projgrids

[Kristian Evers]

On 18 Dec 2017, at 16:11, Even Rouault <even.rouault at spatialys.com<mailto:even.rouault at spatialys.com>> wrote:

On lundi 18 décembre 2017 14:42:28 CET Kristian Evers wrote:
> Even,
>
> Thanks for setting this up! A few comments and ideas:



Basically I just did the first easy step and will now quickly run away before the real troubles show up ;-)



>
>
> 1. Some structure in the repo would be nice. It might be as simple as
> having a folder called "grids" which contain all the grids and then
> README's and other relevant files in the root.



Agreed



>
> 2. We should come up with some rules to govern the repo with. The most
> important here is describing the requirements for getting grids accepted as
> part of the repository. A list of accepted licenses would be handy.



Would the following make sense:
- Public domain
- X/MIT, BSD 2/3/4 clause
- CC0, CC-BY, CC-BY-SA



Or perhaps we could just require the license to be an OSI approved one ? The license of grid files, being data files, should have no consequence on the software stack itself, right ?

I think it is a good start. Software licenses like MIT and BDS are probably not very suited for the purpose, so maybe we should discourage use of those.




> Contact information or some other form of source of the grid is also needed I think.



Agreed. The README could track the provenance & licensing of grids.



>
> 3. Can we convert the old CTable files to CTable2 format? The former
> are architecture dependent. Effectively fixes
> https://github.com/OSGeo/proj.4/issues/44



I don't see any remanining CTable file. As far as I can see, in projgrids, all files are CTable2 except the .gsb files (NTV2) and ntv1_can.dat (NTV1). So the ticket can probably be closed.

I was of the impression that the alaska, conus and a few others were still in CTable format. Great if that is not the case!

>
> 4. Are the current tests affected of your "removal-proposal"? Removing
> the null grid could have some consequences.



I imagine that the tests woud probably require downloading a few grids.

That’s what I figured as well. It should be documented somewhere if it is required to download the grids before tests will pass.




Even



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