ISIS Application Documentation
vikcal | Standard View | TOC | Home |
Radiometric correction of VIKING Planetary images
Description
Categories
Groups
History
Description
VIKCAL performs radiometric corrections to planetary images acquired by the Viking orbiter cameras. VIKCAL performs a radiometric correction in two steps. First, VIKCAL corrects for the varying response of the vidicon across the field of view of the camera. Multiplicative and additive correction coefficients, as a function of line and sample position, are applied to an image array to produce the results of an 'ideal' camera. VIKCAL converts the image data to radiance factor values. The radiance factor is defined as the ratio of the observed radiance and the radiance of a white screen, normal to the incident rays of the Sun.
If run on a non-spiceinited cube, this program requires access to local mission-specific SPICE kernels, in order to find the distance between the sun and the target body. When run on a spiceinited cube, this can be determined using the camera model. Using a spiceinited cube as input has the advantage of not requiring that local mission-specific kernels be available. (See spiceinit web=true.)
Categories
Related Objects and Documents
Applications
Parameter Groups
Files
| Name | Description |
|---|---|
| FROM | Input cube file name |
| TO | Output cube |
Files: FROM
Description
The cube to be calibrated.
| Type | cube |
|---|---|
| File Mode | input |
| Filter | *.cub |
Files: TO
Description
The resultant cube containing the calibrated data.
| Type | cube |
|---|---|
| File Mode | output |
| Pixel Type | real |
| Filter | *.cub |
History
| Elizabeth Ribelin | 2005-05-18 | Original version - Converted from Isis2 |
| Elizabeth Miller | 2005-11-15 | Fixed problems caused by the split of the viking data area |
| Steven Lambright | 2007-08-21 | Fixed poutput pvl to not have spaces in the keyword names |
| Steven Lambright | 2008-05-13 | Removed references to CubeInfo |
| Christopher Austin | 2010-06-16 | Fixed pvl comments |
| Stuart Sides | 2021-02-22 | Added ability to calibrate using the camera instead of direcly using SPICE kernels |