Thanks Hermann, Hermann Peifer <pei...@gmx.eu> writes:
> The lower left corner coordinates of the SD square are: > 300 000 metres East > 400 000 metres North > > So your test coordinate is at (Easting Northing): 380150 402109 > > echo "380150 402109" | gdaltransform -s_srs EPSG:27700 -t_srs EPSG:4326 > -2.30083027968938 53.5152719980087 48.8662291513756 > This led me to understand how to do the transformation based on the easting northings derived from the OSGB definition and it then gives the expected result. From [1] I get the explanation of the converstion of the squares. Are you aware of any way to batch process this in Linux to enable swift conversion of multiple references? > Please note that behind the scenes, these datum shift parameters are > applied: +towgs84=375,-111,431,0,0,0,0 (which might be what you want > .. or not). Sorry, I don't know much about cartography and datums, but guess these are the defaults by gdaltransform? Anyhow, it achieves what I want! :) Regards, Johnny Footnotes: [1] http://digimap.edina.ac.uk/webhelp/os/gazetteer_plus/grid_ref_conversion.htm -- Johnny _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev