[Talk-GB] Generating Mapnik Images to epsg:27700 (British National Grid) Projection
Nick Burch
openstreetmap at gagravarr.org
Wed Apr 22 12:10:37 BST 2009
On Wed, 22 Apr 2009, Kev js1982 wrote:
> Taking the Eastings/Northings and converting to Latitude/Longitude means
> they don't quite match (Holyhead ends up around 20km north of it's
> original location for example) and the tiles don't join properly
Are you aware that WGS84 and OSGB36 use different elipsoids? You'll need
to change the elipsoid as well as the elipsoid if you want everything to
work properly. However, the error's normally more like 500m if you forget,
so I think you might be doing something else wrong if you're out by
multiple kms.
Alas I can't help on the mapnik side of it
Nick
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