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

[Even Rouault]

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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>
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>
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