[PROJ] Formats that use WKT

[Javier Jimenez Shaw]

Thank you!

On Tue, 5 Mar 2024, 18:00 Even Rouault, <even.rouault at spatialys.com> wrote:

> 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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