Isis 3 Application Documentation
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Radiometric correction of Cassini VIMS camera images.
This program applies a dark current and a flat field correction to images, then converts the output units to either specific energy or I/F.
The dark current correction for VIS consists of reading a binary ".tab" file from $cassini/calibration/vims and subtracting derived values from this file.
The dark current correction for IR consists of reading the sideplane data (stored in a SideplaneIr table in the cube) and subtracting this from the input cube. If "CompressorId" is available then the sideplane data was already subtracted from the file, but the linear fit capabilities are still available to re-do the dark current with a linear fit instead of the default subtraction. If spectral summing is on then no dark current can be applied. If spectral editing is on then the linear fit on the dark current can not be applied. Sideplane keywords for IR are as follows:
For both VIS and IR this determines the correct file from $cassini/calibration/vims/flatfield and divides the input data by the flat field data.
The offset and swath keywords will be respected by running "crop" on the calibration files appropriately and using the cropped calibration files.
Use this parameter to choose an Isis cube to be calibrated. To ensure that it contains all needed keywords in its label, input cube should have been imported using vims2isis and, if "I/F" is chosen, input cube must have been run through spiceinit application.
Use this parameter to select the output filename of the calibrated Isis cube.
By default Isis will fit a line to the dark current values, on each band, across the lines since there is one dark value per line. The linear fit value will be applied correctly even if a dark current was applied to this cube beforehand. This disables the line fitting for the dark current. This parameter has no effect for VIS cubes.
If this is false then no dark current values will be subtracted.