Hi, I've got a data set consisting of a bunch of tiled rasters, in a British National Grid (EPSG:27700) projection. I'm trying to re-project them to the Google Maps projection (see below for the proj.4 string I'm using to describe the projection). The commands I'm using have previously worked fine for images from the Blue Marble data set, and from a Portuguese street map data set (in a Lambert Conic projection), but the British images are being offset to the south-east by about 200m when I re-project.
The same British source data re-projects fine into EPSG:4326 for overlaying on Google Earth, so I'm somewhat confused about where my errors are creeping in! I'm using GDAL 1.5.2, my Google Maps projection string is: +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=null +no_defs If anyone can offer any tips, it'd be most appreciated. Oliver _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
