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Hi Carol, re: > REFL doesn't seem to work. Did you use IMGPROBE to see what the valid calibration units are available for the image(s) you are working with? For instance, I just ran the following for a GOES-16 Channel 13 (IR) image: IMGPROBE MODE=N DAT=RTGOESR/FDC13 LAT=0 75 Image Name Day Nominal Time Scan Time Band ---------------- ------- ------------ --------- ---- RTGOESR/FDC13.0 5 Dec 18339 22:30:32 22:35:06 13 File Nominal Image RAW RAD TEMP BRIT Lat/Lon Line/Element Line/Element * K -0:00:24 / 75:00:40 2712/ 2711 10849/10845 1953 87.664 288.82 82 * milliwatts/meter**2/steradian/(cm-1) IMGPROBE: Done And the following for a GOES-16 Channel 01 (Vis) image: IMGPROBE MODE=N DAT=RTGOESR/FDC01 LAT=0 75 Image Name Day Nominal Time Scan Time Band ---------------- ------- ------------ --------- ---- RTGOESR/FDC01.0 5 Dec 18339 22:30:32 22:35:06 1 File Nominal Image RAW RAD ALB BRIT Lat/Lon Line/Element Line/Element * % -0:00:24 / 75:00:08 5424/ 5423 10849/10847 47 12.232 1.84 35 * watts/meter**2/steradian/micron IMGPROBE: Done re: > Maybe BRIT is the best choice for visible channels? BRIT is supported for any/all images supported by McIDAS. The other units supported by, say, IMGCOPY are the ones that are listed in IMGPROBE output. Cheers, Tom -- **************************************************************************** Unidata User Support UCAR Unidata Program (303) 497-8642 P.O. Box 3000 address@hidden Boulder, CO 80307 ---------------------------------------------------------------------------- Unidata HomePage http://www.unidata.ucar.edu **************************************************************************** Ticket Details =================== Ticket ID: VQU-472558 Department: Support McIDAS Priority: Normal Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.