[gdal-dev] GetAreaOfUse() and EPSG:29902

[Simon Wright]

Dear All

Happy New Year!

I'm trying to use the GetAreaOfUse() method on a osgeo.osr.SpatialReference to check the validity of coordinates.

With the following for the Irish National Grid (EPSG:29902) I get the WGS84 bounds - west, east, south, north - of the spatial reference system to be -10.56, -5.93, 51.39, 55.43:

>>> from osgeo import osr
>>> srs = osr.SpatialReference()
>>> srs.ImportFromEPSG(29902)
0
>>> aou = srs.GetAreaOfUse()
>>> aou.west_lon_degree, aou.east_lon_degree, aou.south_lat_degree, aou.north_lat_degree
(-10.56, -5.93, 51.39, 55.43)

However, at https://epsg.io/29902 the WGS84<https://epsg.io/29902%20the%20WGS84> bounds are listed as -10.56, -5.34, 51.39, 55.43.

How is the GetAreaOfUse() method implemented? And is there a bug in the values stored for the EPSG:29902 projection?  Or is there another reason why the values differ to those listed at epsg.io.



Many thanks, best wishes, Simon.




Simon Wright
JBA Risk Management Limited

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