Hi, With Mapserver I am used to correct projection parameters, if needed, by editing directly the projection file which is in MS4W package located at \ms4w\proj\nad\epsg. Now I tried to do the same with FWTools 2.4.2. There is a file with promising name at \FWTools2.4.2\proj_lib\epsg. However, I am pretty sure that editing this file does not change the behaviour of ogr2ogr in any way. Is FWTools taking the projection definitions from some other place or am I doing something wrong?
What I tried to do was to add +towgs84 parameters. Original line is this 3067> +proj=utm +zone=35 +ellps=GRS80 +units=m +no_defs <> and I modified it to this: 3067> +proj=utm +zone=35 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs <> FWTools epsg file is having correct parameters for EPSG:2393 projection, but it seems to me but they are not used either in real use. Only way to get correct results when reprojecting from epsg:3067 to epsg:2393 is to give both projections as +proj strings this way ogr2ogr -f "ESRI Shapefile" output.shp input.shp -t_srs "+proj=tmerc +lat_0=0 +lon_0=27 +k=1 +x_0=3500000 +y_0=0 +ellps=intl +towgs84=-96.0617,-82.4278,-121.743,4.80107,0.34543, -1.37646,1.4964 +units=m" -s_srs "+proj=utm +zone=35 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs" Giving -t_srs or s_srs as epsg:2393 epsg:3067, respectively, gives a faulty result which means that +towgs84 parameters are not used at all. -Jukka Rahkonen- _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
