Hello, I have an AVHRR file that I want to first calibrate and then georeference using IDL (and ENVI). Thanks to the 'envi_avhrr_calibrate_doit' I can input an AVHRR file and get it calibrated. The output of this function is a file of type ENVI. Now, there is also an 'envi_avhrr_geometry_doit' function that does what georeferencing is needed, however, the input file to that function must be of type AVHRR. The problem I'm facing is that I cannot input the file that I calibrate using the 'envi_avhrr_calibrate_doit' function (since it is of type ENVI and needs to be of type AVHRR). I'd be grateful if someone could help me come up with a solution to this problem.   Susanne