[PROJ] Formats that use WKT

[Even Rouault]

Hi Javier,
>
> - GeoTIFF is using its own tags, not WKT
     ==> ESRI has actually an extension (supported by GDAL) where they 
feed ESRI WKT in the PCSCitationGeoKey tag. cf 
https://github.com/opengeospatial/geotiff/issues/56#issuecomment-451130281
> - Geopackage with this extension 
> https://www.geopackage.org/guidance/extensions/wkt_for_crs.html
     ==> WKT1 is part of the core standard. The extension is for 
additional WKT:2015 support . And the latest GeoPackage 1.4 spec also 
allows WKT:2019
> - PAM file in GDAL, but that is cheating ;)

     ==> almost an industry standard. It has been supported by ArcGIS 
for decades 
(https://desktop.arcgis.com/fr/arcmap/latest/manage-data/raster-and-images/auxiliary-files.htm).

"grep -r exportToWkt frmts ogr/ogrsf_frmts" in GDAL also shows:

- netCDF. crs_wkt attribute to the CF CRS encoding
- PDF: in GeoPDF (I don't remember if it is the ISO or OGC Best Practice 
encoding. but it is the ESRI WKT variant I believe)
- ArcInfo ASCII Grid: ESRI WKT in a .prj
- Oracle GeoRaster: in their spatial_ref_sys table or equivalent. Oracle 
WKT: an antique & unique sub-dialect of WKT1
- BAG
- SAGA
- Erdas Imagine. ESRI WKT
- TileDB. WKT1 if PROJJSON not available in a (likely GDAL specific) 
attribute
- MySQL. WKT1 in spatial_ref_sys table
- PostGIS. WKT1 in spatial_ref_sys table
- ESRI FileGeodatabase: ESRI WKT

>
> See that I am looking for formats that store some geo-data, and use 
> WKT to define the CRS (inside or next to it)
>
> Bonus for a "storage format" that uses/supports WKT2!

- FlatGeoBuf, although I realize the spec at 
https://github.com/flatgeobuf/flatgeobuf/blob/master/src/fbs/header.fbs#L63 
isn't super explicit, but GDAL writes WKT:2019 into it

- Zarr. in a GDAL's extension for CRS support

Even

-- 
http://www.spatialys.com
My software is free, but my time generally not.
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