ISIS Application Documentation
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Radiometrically calibrates a Mariner10 image
Overview | Parameters |
Parameter GroupsFiles
Calibration Parameters
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An uncalibrated Mariner 10 image.
Type | cube |
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File Mode | input |
Filter | *.cub |
The resultant radiometrically calibrated cube
Type | cube |
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File Mode | output |
Pixel Type | real |
A cube file containing the calibration coefficients. This file should have eight bands, bands 1-4 are the coefficients for inverting the third order equation, bands 5-6 are the minimum and maximum values to process. Bands 5-6 are only used if the MASK parameter is set to "YES". If MASK is set, pixels with values outside of this range are set to NULL in the output. The mask assures that only pixels with dns in the range of the prelaunch fit are calibrated, dns outside this range are interpolations and may contain large errors. In most cases the default should be used and the files derived from the prelaunch calibration flat fields will be used. These files are named - $ISISMAR10DATA/mariner_10_"First 3 letters of FILTER_NAME"_ "INSTRUMENT_ID"_coef.cub. See also 1) Robinson et al., Jour. Geophys. Res., 97, p.18265-18274, 1992. 2) Robinson and Lucey, Science, 275, p. 197-200, 1997. 3) Robinson et al., abstracts of Lunar Planetary Sci. Conf. XXVIII, p. 1187-1188, Lunar and Planetary Inst, Houston, TX, 1997.
Type | cube |
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File Mode | input |
Pixel Type | real |
Internal Default | Internal Default |
This parameter allows the user to use an alternate dark current file. In most cases, the default should be used for this parameter to indicate the derived dark current file is to be used. The name of the derived dark current file is $ISISDATA/mariner10//mariner_10_"InstrumentId"_dc.cub. The InstrumentId wil have a value of "A" or "B".
Type | cube |
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File Mode | input |
Pixel Type | real |
Internal Default | Internal Default |
If TRUE, bands 5-6 of the coefficient cube are the minimum and maximum values to process. Any values outside of this range are set to NULL in the output file. Caution should be used in setting MASK to FALSE - the resulting dns may have less than optimal radiometric integrity.
Type | boolean |
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Default | True |
Apply blemish removal mask.
Type | boolean |
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Default | True |
Approximation for iterative solution.
Type | double |
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Default | 75.0 |
After dark removal and linearity correction an absolute coefficent needs to be applied to put the data in units of radiance. These coefficents (1 for each camera-filter combination) are still being refined. The values are being derived by forcing global mosaics (photometrically corrected) to Earth based measurements. for futher explanation see; 1) Robinson and Lucey, Science, 275, p. 197-200. 2) Robinson et al., abstract of Lunar Planetary Sci. Conf. XXVIII, p. 1187-1188, 1997.
Type | double |
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Internal Default | Internal Default |
Offset to be added to Exposure time. If the default of NULL is used the following values are added to the offset: Camera A EXPOFF = 0.316 msecs Camera B EXPOFF = 3.060 msecs These values are taken directly from the Benesh and Morrill JPL calibration document. They state that there are some unknowns with these values... Read the section on their page 38.
Type | double |
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Internal Default | Camera A = 0.316 msec Camera B = 3.060 msec |