On Mon, 2007-09-24 at 00:29 +0100, Chris Jewell wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi all, > > I have a problem converting OSGB coordinates to lat/long coordinates. > Currently, my > data exists in OSGB (SRID 27700), and I need to convert to WGS84 for > inclusion in a KML > file. However, currently all the points turn out as approximately 100-200m > from where > I expect them to be. Looking at the PROJ4 mailing list, it seems that there > was some > issue with the datum used for the conversion > (http://lists.maptools.org/pipermail/proj/2006-May/002265.html). This has > been fixed > in the latest version of PROJ4, which I downloaded, compiled, and installed. > However, > this has not fixed my problem with PostGIS. Do I have to modify the > spatial_ref_sys > table to use the new datum in PROJ4? If so, how? > > Many thanks, > > Chris
Hi Chris, Yes, you need to make sure you are using PROJ 4.5.0 and perform an update on your spatial_ref_sys table to append the extra datum parameter to the proj4text field - see http://postgis.refractions.net/pipermail/postgis-users/2007-July/016525.html for more information. HTH, Mark. -- ILande - Open Source Consultancy http://www.ilande.co.uk _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
