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Update README with info on PROJ-data #2015

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Update README with info on PROJ-data #2015

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Expand Up @@ -51,27 +51,28 @@ number, and "z" indicates the patch number of the release.

In addition to the PROJ software package, distributions of datum
conversion grid files and PROJ parameter files are also available.
The grid package is distributed under the name `proj-datumgrid-x.y.zip`,
The grid package is distributed under the name `proj-data-x.y.zip`,
where "x" is the major release version and "y" is the minor release
version numbers. Similarly regional packages are distributed. The
regional packages contain resources that are not essential to the
functionality of PROJ but still of value to users in the region
specific to the package. All grids that were in proj-datumgrids-1.6
remain in proj-datumgrids-1.7; the regional datumgrid files contain
grids for datums not previously supported (prior to PROJ 5.0.0).
version numbers. The resource packages can be downloaded from the
[PROJ website](https://proj.org/download.html).

The resource packages can be downloaded from the [PROJ website](https://proj.org/download.html).

More info on the contents of the various resource packages can be
More info on the contents of the proj-data package can be
found at the
[proj-datumgrid GitHub repository](https://github.com/OSGeo/proj-datumgrid).
[PROJ-data GitHub repository](https://github.com/OSGeo/PROJ-data).

The resource file packages should be extracted to `PROJ_LIB`
where PROJ will find them after installation. The default location of
`PROJ_LIB` on UNIX-based systems is `/usr/local/share/proj` but it may
be changed to a different directory. On Windows you have to define
`PROJ_LIB` yourself.

As an alternative to installing the data package on the local system,
the resource files can be retrieved on-the-fly from the
[PROJ CDN](https://cdn.proj.org/). A network-enabled PROJ build will
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automaticall try to fetch resource files that are not present locally from the
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CDN.


## Citing PROJ in publications

See [CITATION](CITATION)