USGS

Isis 2 Documentation


m9level1 Documentation

M9LEVEL1 - Mariner 9 Level 1 Processing
PROGRAMMER:  MARS1::KEH (Ken Herkenhoff, Caltech)
This procedure finds and removes reseaux, corrects missing lines (if
necessary), filters out bit errors, subtracts residual image, linearizes,
and corrects for filter/vidicon shading, exposure time and solar distance
in Mariner 9 television imaging data.  The following programs are
executed in sequence to remove instrumental signature from raw Mariner 9
images and produce a 16-bit radiometrically corrected image:  FINDRX,
M9MLRP, BEF, REMRX, M9RES, SPICELAB, LINEARIZE, and M9RADIOM.  If the
default for PREVIOUS is not changed, residual image subtraction
correction will not occur (M9RES will be skipped).  Intermediate results
of each step are saved on disk in case of errors until successful
creation of the corrected image (FROM + C.PIC).  The image that has
been filtered and had reseaux removed (FROM + X.PIC) is saved in any
case for future residual image subtraction, and may be deleted after the
succeeding image has been processed.  Details of each processing step
are described in each program's help file.

ParmDescriptionDefault
FROM
Mariner 9 raw image file
(do not include extension,
 .cub is assumed)
NONE
PREVIOUS
Previous image (same camera)
(default extension is .cub)
"NONE"
PICNO
6 digit picture number
--
ADD25
Add 25 lines to beginning
of image?
"YES"
TOLERNCE
For noise filter (8-bit DN)
14

ADDITIONAL NOTES:

ParmDescription
FROM
A raw Mariner 9 image filename. This input file must contain
8-bit data. Do NOT include the extension with the filename.
The program will assume .cub as the filename extension.
PREVIOUS
If an image exists that has a DAS count of exactly 70 less
than that of the input image FROM, it should be processed
to remove reseaux and noise.  The filtered image may have
been produced by a previous run of M9LEVEL1, in which case
it will have a filename of the form:  FROM + X.cub and
PREVIOUS should be set to that name.  In any case this file
must be 8-bit and the image must be the immediately previous
image taken with the same camera.  If there is no such image,
leave the default value "NONE".
PICNO
The picture number of the image, in the following format:
rrrcxx, where rrr is the orbit number (examples: 123 or
012); c is the camera (A or B), and xx is the frame number
(examples: 01 or 33). Only provide this number if the
picture number on the labels is incorrect.
ADD25
Determines if 25 lines of NULLs will be added to the top of
the FROM and PREVIOUS images before processing.  The Mariner
9 images distributed by PDS are missing the first 25 lines of
data.  The 25 lines need to be added in order for the reseau
and calibration files to correspond to the correct location in
the image file.
TOLERNCE
This is the tolerance in 8-bit DN for the bit-error filtering
program BEF (see description in BEF).

Last updated: Jan 31 2005
File: pdfs2.html

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