I have a raster/grid file transformation and conversion question: The input are hunddrets of GIF files which in fact are a grid about rainfall observations. The files have 8 BitsPerPixel (0..255). The B channel (integer value) from RGB obviously represents the precipitation intensity in [mm/h] according to a lookup table (0=>0, 1=>0.2, 2=>0.32, 3=>0.5, 4=>0.8, 5=1.3, 6=>2, 7=>5, 8=>8 9=>13 10=>20, 11=>32, 12=>50, 13=>50, 14=>80, 15=>130).
The GIF size (= grid size) is 400x400 pixel with a cell size of 1000m. The following is known about the geolocation (Switzerland, EPSG:21781/CH1903): xmin: 481000, ymin: 38000 and xmax: 881000, ymax: 438000. The target format is ASCII Gridded (XYZ)? or Arc/Info ASCII Grid (AAIGrid), with e.g. the following on each line: "481000 38000 0.32", meaning the transformed coordinates x and y and the float value (as indicated above in the lookup table). I know OGR but I'm new to GDAL: How would you accomplish this task? Transforming with gdal_transform then converting with gdal_translate ? Or do I have to write something myself (perhaps based on gdal2xyz.py)? -S. _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
