[postgis-users] OSGB to lat/long conversion

[Chris Jewell]

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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
- --
Chris Jewell, BSc(Hons), BVSc, MRCVS
Dept of Maths and Statistics
Fylde College
Lancaster University
Lancaster
Lancs
LA1 4YF
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