ISIS Application Documentation
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Radiometric correction of Clementine UV/VIS camera images
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PLEASE NOTE: In the ISIS2 Fortran code the method FIXTEMP uses a REAL*4 (6 digits of accuracy) to store the RIMGID (8 digits) which results in the last digits being lost. In the table that references RIMGID the value is a REAL*4 again resulting in the same loss of precision; this makes the lookup table for temperature corrections inaccurate.
Name | Description |
---|---|
FROM | Input file name |
TO | Output file name |
Name | Description |
---|---|
CONV | Convert to I/F reflectance |
TCOR | Use temperature correction |
DARKCURRENT | Dark current data source |
DCCONST | Dark current constant |
DCFILE | Dark current file |
FFFILE | Array of flat-field coefficients |
Specify the input file to be corrected.
Type | cube |
---|---|
File Mode | input |
Filter | *.cub |
Specify the output file. The result will be the radiometrically corrected image. The output values can either be output as absolute radiance or converted to reflectance (I/F) values.
Type | cube |
---|---|
File Mode | output |
Pixel Type | real |
Filter | *.cub |
This option allows the output values to be written as absolute radiance or converted to reflectance values (I/F).
Type | boolean |
---|---|
Default | true |
This option defines whether or not to use temperature correction. If disabled, the focal plane temperature read from the labels is used (if it is not equal to zero, otherwise temperature correction is used anyways). When TCOR is enabled, the temperature read from the labels is disregarded and a table is searched based on the orbit number and mission phasederived from the ProductID stored in the labels.
Type | boolean |
---|---|
Default | true |
This option allows the user to input a constant value for the dark current, or alternatively a cube file with dark current values (default).
Type | string | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Default | DCFILE | |||||||||
Option List: |
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This constant will replace the array of dark current coefficients in the derived 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.
Type | double |
---|
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/clementine1/calibration/uvvis/dark_5_15_96.cub.
Type | cube |
---|---|
File Mode | input |
Internal Default | Automatic |
Filter | *.cub |
This parameter allows the user to use an alternate flat-field file. In most cases, the default should be used for this parameter to indicate the derived flat-field file is to be used. There is a different version of the flat file for compressed and uncompressed images. The name of the derived flat-field file is $ISISDATA/clementine1/calibration/uvvis/lu[filter]_[un]comp_flat_long.cub. An example for a compressed B filter image is $ISISDATA/clementine1/calibration/uvvis/lub_comp_flat_long.cub.
Type | cube |
---|---|
File Mode | input |
Internal Default | Automatic |
Filter | *.cub |
Calibrating a cube to I/F values using temperature correction
Calibrate lua1841h.cub using temperature correction In this example clemuvviscal will calibrate lua1841h.cub using temperature correction. |
Image before correction
Parameter Name:
FROM This is the input image lua1841h.cub before being corrected with clemuvviscal. |
Image after correction
Parameter Name:
TO This is the input image lua1841h.cub after being corrected with clemuvviscal. The values in this cube are all I/F because CONV was set to true by default. |
Tracie Sucharski | 1994-11-18 | Original Version (uvviscal.F) |
Steven Lambright & Steven Koechle | 2007-05-16 | Converted to Isis 3.0 |
Steven Lambright & Steven Koechle | 2007-06-07 | Beautified and forcing output pixel type to real. |
Steven Lambright | 2007-06-14 | Cleaned up XML, added an example and added Radiometry group to labels of output cube. |
Steven Lambright & Steven Koechle | 2007-06-18 | Fixed problem with solar distance calculation |
Steven Lambright | 2008-02-08 | Changed TCOR paramter's default to TRUE |
Christopher Austin | 2008-02-20 | Altered the output cube's BandBin group, changing the Keyword "Name" back to "FilterName". |
Steven Lambright | 2008-05-13 | Removed references to CubeInfo |
Christopher Austin | 2009-06-11 | Fixed a segmentation fault. |