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USGS

ISIS Application Documentation


vikcal

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Radiometric correction of VIKING Planetary images

Overview Parameters

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.)


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History

Elizabeth Ribelin2005-05-18 Original version - Converted from Isis2
Elizabeth Miller2005-11-15 Fixed problems caused by the split of the viking data area
Steven Lambright2007-08-21 Fixed poutput pvl to not have spaces in the keyword names
Steven Lambright2008-05-13 Removed references to CubeInfo
Christopher Austin2010-06-16 Fixed pvl comments
Stuart Sides2021-02-22 Added ability to calibrate using the camera instead of direcly using SPICE kernels

Parameter Groups

Files

Name Description
FROM Input cube file name
TO Output cube
X

Files: FROM


Description

The cube to be calibrated.

Type cube
File Mode input
Filter *.cub
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X

Files: TO


Description

The resultant cube containing the calibrated data.

Type cube
File Mode output
Pixel Type real
Filter *.cub
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