Good day, almost a complete newbie here but making progress! I have followed all the examples of GDALwarp with some success and also been able to use GDAL_translate to take an image with no geoferenced info and generate a UTM GeoTIFF (including screens from Google Earth)
However my ultimate aim is to take a Mercator chart and generate a background image as a UTM GeoTIFF, this so far has eluded me! I have a Mercator Chart with the known corners in Lat/Long coordinates degrees, but I can't find a suitable EPSG/Proj4 projection that allows the use of Lat/Long degrees to designate -a_ullr for GDAL_translate. The following almost works: GDAL_translate -a_srs WGS84 -a_ullr -45 78.5 45 53.5 <source tif> <merc geotiff) then: GDALwarp -t_srs EPSG:32631 <merc geotiff> <UTM geotiff> But of course the result still has unequally-spaced lines of Latitude because the WGS84 input to GDAL_translate assumes the "google earth" type projection...not Mercator Any ideas are very welcome - I have been circling this problem for several days. Geoff _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
