[postgis-users] SRID tranformations (OSGB 1936)

[Vyron Antoniou]

Hi,

I think I'm missing something with SRIDs and transformations but I don't
really know what!!!

I have some POIs in WGS84 [ex. SRID=4326;POINT(-1.78103 51.09168)].

When I transform them into "OSGB 1936 / British National Grid" I use the
function: Transform(the_geom,27700) so the result for the above point is :
SRID=27700;POINT(415333.48161197 132490.68798396).

BUT.... if I use the transformation tool at
http://www.geograph.org.uk/latlong.php the result is:

[WGS84: 51:5.5008N 1:46.8618W]
Datum: Ordnance Survey Great Britain 1936
Easting/Northing: 415431,132508

Running some test with GIS software it seems that the latter is the
correct transformation

Any ideas?

Cheers!
Vyron