Simon,
epsg.io is not a reference site. You should rather consult epsg.org
For CRS EPSG:29902, it refers to extent
https://epsg.org/extent_3767/Ireland-onshore.html which has -5.93° as
east longitude
https://epsg.org/extent_1305/Europe-Ireland-Republic-and-Ulster-onshore.html
has -5.34° as east longitude. So epsg.io is perhaps confused by which
extent to use, or an update has occured between the last state of the
database it used and today.
Even
Le 03/01/2023 à 18:33, Simon Wright a écrit :
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.
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