[gdal-dev] How to use geokey CoordinateEpochGeoKey in Geotiff from Python

[David Shean]

Hi Even,
Thanks for the pointer to this resource, and for working to support this important functionality.  
Would it make sense to add the -a_coord_epoch option to gdal_edit.py, so users can directly update the GeoTiff header for a dataset with known epoch?
-David



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> On Jan 17, 2024, at 11:40 AM, Even Rouault via gdal-dev <gdal-dev at lists.osgeo.org> wrote:
> 
> Hi,
> 
> cf test_tiff_write_coordinate_epoch() in https://github.com/OSGeo/gdal/blob/3a9541d19f2df52f1e66dacfa33878531a5f2c58/autotest/gcore/tiff_write.py#L9575
> 
> On the command line you might use: gdal_translate in.tif out.tif -a_coord_epoch XXXX.YYY
> 
> Even
> 
> Le 17/01/2024 à 20:20, Glen Rice - NOAA Federal via gdal-dev a écrit :
>> Hello,
>> 
>> We are trying to create geotiffs from Python and specify an epoch for a dynamic CRS.  Is there a way to do this from python or a command line utility?
>> 
>> We see the pull request adding CoordinateEpochGeoKey (5120) and expect I could print the information from gdalinfo if I had an example file.  If we were in C/C++ then we could use libgeotiff and GTIFKeyGet( ).  However we are in Python and we don't see how to write either the CoordinateEpochGeoKey, or even a generic geokey, into a geotiff.
>> 
>> For reference we looked at the following links:
>> https://gdal.org/user/coordinate_epoch.html
>> https://github.com/opengeospatial/geotiff/issues/78
>> https://github.com/opengeospatial/geotiff/pull/99
>> https://github.com/OSGeo/libgeotiff/blob/master/libgeotiff/geokeys.inc
>> 
>> Thanks for any help,
>> Glen and Barry
>> 
>> --
>> Glen Rice
>> National Bathymetric Source
>> Hydrographic Systems and Technology Branch
>> Office of Coast Survey / Coast Survey Development Laboratory
>> 
>> 
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