HiRISE Radiometric Calibration |
HiRISE Radiometric Calibration |
Jun 11 2010, 03:23 AM
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Newbie Group: Members Posts: 6 Joined: 13-October 08 Member No.: 4450 |
Dear HiRISE experts,
I have obtained .tiff files of HiRISE images taken from PDS. They are all 10-bit data. I would just like to obtain the I/F for each of these images. I basically calculate the I/F from equation: I/F = (gain*DN) + offset. I use the gain and offset provided in the .LBL within PDS for each image. Now the question is - can I use the 10-bit data in the I/F calibration equation? Do I need to convert this 10-bit data to 14-bit data? If I do that, can I basically multiply each DN value by 2^4? If this is not possible, how can I obtain the original 14-bit data? If it is 10-bit data, the dynamic range of I/F for my images in the southern polar dunes (PSP_003386_1080) only spans from 0.09 to 0.2. I have read that frost/ice can approach much higher reflectance values. There must be something that I am missing. If it is 14-bit data, the dynamic range would span 0.09 to 1.5. Any advice that you could provide, would signficantly help. This has been a bit confusing for me. Thank you so very much. -manish mehta |
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