m9radiom Documentation

M9RADIOM - Mariner 9 Radiometric Correction
PROGRAMMER:  MARS1::KEH (Ken Herkenhoff, Caltech)
M9RADIOM corrects Mariner 9 images for solar distance, exposure time, and
shading.  SPICELAB must be run first to provide SEDR data in the header
of the input image.  The input image should be in raw distorted space.
Both input and output images are 16-bit data files.  It is assumed that
the input file has been linearized (see LINEARIZE).  The filter number
in the formatted labels is used to find the correct shading file, and the
exposure time from the labels is used to find the actual preflight
exposure time.  The solar vector in the labels is used to calculate the
distance to the sun (R) in astronomical units.  Each data value in the
image is then corrected as follows:
   OUTPUT = INPUT * FF * R*R * SHADING / EXPOSURE
where FF is a multiplicative factor that depends upon the filter used and
scales the output to units of I/F * 10000.  I/F is the ratio of the
observed intensity to the solar flux, and is related to albedo through
the photometric function.  For more details, see Herkenhoff et al., 1988
in Icarus (in press).

Input image file name
(default extension is .cub)

NONE

Output image file name
(default extension is .cub)

NONE

ADDITIONAL NOTES:

Parm	Description
FROM	The input Mariner 9 image file must be linearized (16-bit), and not geometrically transformed. If the file extension is omitted, then ".cub" will be assumed.
TO	The 16-bit output file is radiometrically corrected, with each pixel value equal to I/F * 10000. If the file extension is omitted, then ".cub" will be assumed.