README
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This bundle was migrated by the PDS Ring-Moon Systems Node from PDS3 to PDS4.
Data files were not affected, and all metadata available in the PDS3 volumes has
been captured in the PDS4 bundle. Users can find the original EUV/FUV PDS3 
labels in the Cassini UVIS volset at 
https://pds-rings.seti.org/viewmaster/volumes/COUVIS_0xxx. 

As part of the migration process, a number of errors in the PDS3 metadata were 
identified and corrected. For products affected by these changes, additional
comments have been added to the PDS4 labels. A complete description of the 
corrections is available in migration_modifications_uvis_euvfuv_cruise.txt in 
the document collection, which users are encouraged to review.

The document collection also includes a comprehensive UVIS User's Guide. This 
was originally written for PDS3 and has been updated for PDS4 (specifically, 
the EUV/FUV parts). The PDS3 Software Interface Specification (SIS) provides 
a detailed description of the PDS3 UVIS data products. 

There is a one-to-one correspondence between raw data and calibration files,
except in these two cases: euv2002_157_02_11 and euv2002_157_17_13, for which
there are no calibration files. For those, notes have been entered into the raw
data PDS4 labels.

The products in the browse collection contain significant amounts of information.
Refer to uvis-preview-interpretation.txt in the document collection for guidance 
on interpreting these image products.

In the original PDS3 delivery, each volume had a CALIB/ directory, which contained 
the calibration files that are now included in the PDS4 calibration collection. 
Another subfolder SOFTWARE/CALIB/ contained the software and associated input files 
that were used to generate the calibration data. PDS will not support or maintain 
software in the archive, and so those files are not directly included in this PDS4 
bundle - instead they are available via the linked Source_Product_External reference 
for the calibration software in bundle.lblx.

Similarly, the geometry values included in the data object labels were computed
using the software contained in the GEOMETRY_ENGINE.PRO file located under the
PDS3 SOFTWARE/GEOM directory (and using the NAIF SPICE software library). These 
are available via the linked Source_Product_External reference for the geometry
software in bundle.lblx. 

Likewise, the IDL routines to load UVIS PDS3 data and label files into an IDL
session were provided under the PDS3 SOFTWARE/READERS directory. These routines 
are available via the linked Source_Product_External reference for the readers 
software in bundle.lblx.

Note there is a Python package named `pyuvis` that provides tools to work with 
Cassini UVIS data (https://github.com/Cassini-UVIS/pyuvis).

Additional improved and enhanced metadata will eventually be archived by the 
Ring-Moon Systems Node in a separate bundle. In the meantime, enhanced metadata 
can be obtained at
https://pds-rings.seti.org/viewmaster/metadata/COUVIS_0xxx/COUVIS_0999.


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For questions concerning this data set, please contact:

Mia Mace / Matthew Tiscareno
Ring-Moon Systems Node, NASA PDS
SETI Institute
339 Bernardo Ave.
Mountain View, CA 94043
Email: mmace@seti.org
Email: mtiscareno@seti.org