On 14 March 2013 21:17, Steve <stephen.pete...@sky.com> wrote: > Hello fellow OSMers > > A hopefully straightforward newbie question for you... > > I'm currently uploading various new polygons via shapefiles created in > Quantum GIS. These use the WGS84 (EPSG:4326) projection, which Quantum > defines as: > > +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs +towgs84=0,0,0 > > A fellow mapper is doing similar, great stuff mapping administrative > boundaries (Parishes etc) from Ordnance Survey, and setting the projection > with the following parameters: > > +proj=longlat +ellps=WGS84 +datum=WGS84 +zone=30 +no_defs > > Because of the different parameters (i.e. I have +towgs84=0,0,0, and he has > +zone=30), there is a slight offset in data we are creating in the same > areas. > > The question is: which one of us is correct? >
Ordnance Survey data is (normally) EPSG:27700 OpenStreetMap is: EPSG:4326 Zone is used for creating an offset origin point. Doubt that is what you want... Set OSM as a background layer in QGIS: http://www.3liz.com/blog/rldhont/index.php?post/2012/07/17/OpenStreetMap-Tiles-in-QGIS / Grant _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
