Level0_VIMS

Level0 VIMS ¶

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• Level0 VIMS
  • 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 ).

• VIMS

For Level 0 processing of VIMS 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 VIMS EDR data will have one file to download for ISIS ingestion, the image data file (v img_number .qub).

The IR and VIS data are archived together within the same 'cube' file.

Ingestion ¶

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In order to cartographically process VIMS 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 vims2isis .

Notes:

• The vims2isis application creates two separate output files separating the VIS and IR data.
• PDS releases a detached .lbl with the .qub, ingest the .qub only

Example (includes the specified output cube attribute for band sequential):

  vims2isis from=v1514302573_1.qub  ir=v1514302573_1_ir.cub  vis=v1514302573_1_vis.cub

Sample image (v1514302573_1) is a VIMS observation of Titan [Sequence_Id=S17; Observation_Id=VIMS_019TI_HDAC001]

Input PDS cube: Samples=64 x Lines=64 x Bands=352 (IR=256 bands; VIS=96 bands)

SPICE ( S pacecraft & P lanetary ephemeredes, I nstrument C -matrix and E vent kernels) ¶

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The application spiceinit will add the appropriate SPICE information to the ISIS image cube. Spiceinit must be applied to both the VIS and IR cubes.

Example:

spiceinit from=vxxxxx_ir.cub
spiceinit from=vxxxxx_vis.cub

A successful spiceinit allows further processing:

Raw Camera Geometry ¶

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

• Camera Geometry Overview and Applications

• Level1 - Radiometric Calibration

• Level2 - Map Projection