Isis 2 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.
Parm | Description | Default |
---|---|---|
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) |
ADDITIONAL NOTES:
Parm | Description |
---|---|
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). |
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