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
Use OPUS, our versatile search
engine to find and retrieve specific Voyager ISS data products
using a wide range of criteria.
Search results are provided with thumbnail images for each
observation, and include options to download compressed raw images,
thumbnail images, tables of associated metadata, and if available
versions of the images in various stages of processing from
uncompressed raw images through fully calibrated and geometrically
corrected images. User selected data files can be bundled as zip files
for easy downloading.
The table below provides direct access to the calibrated
volumes and to available tar.gz subsets of the calibrated
volumes.
Clicking on the VOLUME_ID will take you to the root
directory of the volume.
To download an entire volume, right click on that
volume's "Compressed Volume" link in the second column.
Generally we do not prepare a compressed version
until the volume is ready for peer review. However, we will
respond as quickly as possible to user requests for such files
of preliminary volumes.
Since the compressed volumes can be quite large, as we generate
them, we also usually generate multiple tar.gz files containing subsets
of the volume based on processing level. These can be downloaded
from our archives directory.
The compressed volumes are provided in .tar.gz format. For
information on opening files of this type, click
here.
Browse links go to directories of 200 X 200 pixel GIF
images.
Browse images for VG_0001 & VG_0002 are on VG_0003.
Browse images for VG_0004 are on VG_0005.
Browse images for VG_0006 & VG_0007 are on VG_0008.
Browse images for VG_0009, VG_0010 & VG_0011 are on VG_0012.
Clicking on INDEX.TAB will take you to the index file for that
volume. The index file is a twenty one column, ASCII table listing
each image on the volume along with some information extracted from
that image's label file. Descriptions of the columns can be found in
the INDEX.LBL file in the INDEX subdirectory on each volume.
Volume ID
Compressed Volume
Browse Link
Index Link
FDS Range
Preliminary Jupiter Data - Raw and Cleaned Images, Documentation Incomplete
* Volumes VGISS_0004 & 0005 (Saturn) and 0006 through 0008 (Jupiter) contain selected images
from the respective encounters. Almost all of these images are included in later volumes of the
data set.