Level0_ISS

Level 0 ISS ¶

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• Level 0 ISS
  • Data Acquisition
  • Ingestion
  • SPICE (Spacecraft & Planetary ephemeredes, Instrument C-matrix and Event kernels)
  • Raw Camera Geometry

Data Acquisition ¶

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A major official source for Cassini ISS image data is through the Planetary Data System ( PDS ).

• ISS

For Level 0 processing of ISS image data, ISIS3 expects PDS raw Experiment Data Record ( EDR ) images. EDR data has not been radiometrically calibrated and contains the "mission-specific" label keyword information that is required by ISIS3 for cartographic processing.

The PDS ISS EDR data will have two files to download for ISIS, a detached PDS label file (img_number.LBL) and the image data file (img_number.IMG).

Ingestion ¶

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In order to cartographically process ISS image data within ISIS3, the raw PDS EDR data must be converted to ISIS with the appropriate application that correctly imports the required mission specific keywords. The application is ciss2isis .

Example:

ciss2isis from=xxxx.LBL  to=xxxx.cub

Note:

• Both the .LBL and .IMG must be in the same directory together
• The LBL and IMG extensions must be in upper or lower case consistent with each other (.LBL/.IMG or .lbl/.img).

SPICE (Spacecraft & Planetary ephemeredes, Instrument C-matrix and Event kernels) ¶

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The application spiceinit will add the appropriate SPICE information to the ISIS image cube.

Example:

spiceinit from=xxxx.cub

Successful spiceinit allows for further processing of ISS data:

• Level1 - Radiometric Calibration
• Level2 - Map projection

Raw Camera Geometry ¶

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Once spiceinit has been successfully applied to a raw ISIS image cube and abundance of information can be computed and retrieved for geometry and photometry.

• Camera Geometry Overview and Applications