Hi, my question belongs to the task "geocoding and radiometric calibration" Must have the DEM and the Input file the same spatial extend? I need to process just a little part out of big a SAR scene! So does it proceed only the part where a DEM information does exsist or do I need to cut it before? By the way, what type of file shall be the input DEM (ASCII?)? I'm hopefully waiting for help, Regards Marion