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[SPACER] [SPACER]

Overview

The PDS Rings Node is producing four new multivolume Voyager ISS data sets - one for each of the outer planets.

Please notifiy us if you find any errors or have recommendations to improve these data sets.

The volume IDs are VGISS_xxxx as opposed to the originally distributed volumes with IDs VG_xxxx. Although the contents of the volumes have been reorganized, there is a one-to-one correspondence between the calibrated volumes and in their counterpart volumes in the originally distributed, raw only, data set (e.g., VGISS_0004 covers exactly the same FDS range as VG_0004).

    These new data sets contain data from four processing levels:

    • Raw Image: uncompressed version of the original file
    • Cleaned Image: spikes and reseau marks removed
    • Calibrated Image: dark current subtraction and calibration model applied
    • Geomed Image: geometrically corrected image

    The processing levels are progressive (i.e., geometrically corrected images have also been cleaned and calibrated). For information on processing levels, please see a Voyager calibrated ISS TUTORIAL.TXT file found in the DOCUMENT directory of each volume.

    The data directories in the original volumes were sorted by target. In response to recommendations from the peer review panel for the Saturn data set, the data directories in the calibrated volumes will be sorted by image number. This extensive reorganization is implemented during the updating between preliminary and peer review versions. In the case of the Saturn data set the reorganization was implemented post peer review.

    Each data set is placed on line as quickly as possible - before the full set of processing steps is complete. The current development statis of a given volume can be determined from the volume name:

    • VGISS_xxxx_prelim - a "preliminary" data set. Contains all of the images in at least the raw and cleaned formats; may also contain calibrated and geometrically corrected images. The individual image metadata will be available in the VICAR header for each image, but PDS label files and some additional documentation will not be present.

    • VGISS_xxxx_peer_review - a data set ready for, or in, peer review. Will contain raw, cleaned, calibrated and geometrically corrected images. Each image retains its VICAR header and is accompanied by a PDS label file.

    • VGISS_xxxx_lien_resolution - a data set which has passed peer review with liens that are currently being resolved.

    • VGISS_xxxx - the final, fully archived version of a data set.

For data sets which have reached peer review or higher status, we provide compressed, tar.gz files to enable easy downloading of entire volumes. For information on opening files of this type, click here. The preliminary version volumes for the Uranus data are also available as tar.gz files. Compressed archives of the other preliminary version volumes are not available; however such files will be produced by request.

The individual volumes, even compressed for download, are very large. Consequently in addition to providing a tar.gz file for an entire volume, we provide multiple tar.gz files containing subsets of each volume based on processing level.

Each subset tar.gz file contains all documentation files from the full volume and all the data files at one of the four processing levels: raw, cleaned, calibrated, or geometrically corrected. The first two types are typically ~ 500MB, the last two are ~1-2 Gbytes.

Users are strongly encouraged to review the TUTORIAL.TXT and the PROCESSING.TXT files. The tutorial is a comprehensive guide to the data in these data sets, and the processing document gives a detailed description of the processing steps behind the data files in these data sets. Both documents are included in the DOCUMENT directory of each volume.

Current Status of each Data Set

Jupiter

  • Preliminary version, not PDS Certified as suitable for research.
  • Contains uncompressed raw and cleaned images and limited documentation (e.g., no PDS labels for the image files).
  • The data directories are sorted by target (original structure) not by image number.
  • Compressed tar.gz files are not available on line.

Saturn

  • Lien-resolution version, PDS Certified as suitable for research.
  • Contains all processing levels and documentation.
  • Data directories are sorted by image number, not target.
  • Compressed tar.gz files are available on line.

Uranus

  • Preliminary version, not PDS Certified as suitable for research.
  • Contains all four processing levels, but no image label files.
  • The data directories are sorted by target not by image number.
  • We have concerns about the validity of some of the calibrated images in this data set. The calibration was done with an early version of the pipeline. The data set will be re-calibrated, and the data directories will be reorganized by image number prior to release for peer review.
  • Compressed tar.gz files are available on line.

Neptune

  • Preliminary version, not PDS Certified as suitable for research.
  • Contains uncompressed raw and cleaned images and limited documentation (e.g., no PDS labels for the image files).
  • The data directories are sorted by target (original structure) not by image number.
  • Compressed tar.gz files are not available on line.

Naming conventions

For details on the volume structure and file naming conventions, please review a Voyager calibrated ISS AAREADME.TXT file (especially section 4). This file (with minor header variations) appears in the root directory of every volume. NOTE: AAREADME files in preliminary volumes may be incomplete.

Getting the Data You want