Naming conventions and Directory Structure

Raw image files are named Cnnnnnnn.IMQ, where ‘nnnnnnn’ is the FDS count (without a decimal point) and “IMQ” indicates that the file is a compressed image. Generally, for the Jupiter encounter, images beginning with 1 are from Voyager 1 and those beginning with 2 are from Voyager 2. Similarly, for the Saturn encounter, images beginning with 3 are from Voyager 1 and those beginning with 4 are from Voyager 2. The Voyager 2 FDS clock was reset prior to the Uranus and the Neptune encounters. Consequently the FDS counts, and therefore filenames, for these encounters are numerically smaller than those for the Saturn encounter.

The images are stored in subdirectories named for the nominal target of the observation. Many images contain more than one target and some images missed their intended target, so the directory structure provides nothing more than general guidance about the contents of the images.

For details on the volume structure and file naming conventions, please review a Voyager ISS AAREADME.TXT file (especially section 4). This file (with minor header variations) appears in the root directory of every volume.

This link, Calibration notes provides references for Voyager image calibration.

The following links are to hypertext versions of representative VOLINFO.TXT, DATASET.CAT and REF.CAT files. These files are included on every volume.

This link provides access to the narrow angle and wide angle camera descriptions.

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. User selected data files can be bundled as zip files for easy downloading.
  • The table below gives direct online access to the individual 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.

The compressed volumes are provided in .tar.gz format. For information on opening files of this type, click here.

  • Clicking on the corresponding “Browse” link will take you to the browse directory for the specified volume. Most volumes contain their own browse images. The exceptions are:
    • 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 IMGINDEX.TAB will take you to the index file for that volume. The index file is a twenty two 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 Bundled Volumes Browse Images Index File FDS Range
Jupiter Encounter
VG_0006 VG_0006.tar.gz Browse Images IMGINDEX.TAB 13854.55
to
17574.27
VG_0007 VG_0007.tar.gz Browse Images IMGINDEX.TAB 18110.30
to
20626.28
VG_0008 VG_0008.tar.gz Browse Images IMGINDEX.TAB 20626.29
to
20863.06
VG_0013 VG_0013.tar.gz Browse Images IMGINDEX.TAB 14604.13
to
15423.20
VG_0014 VG_0014.tar.gz Browse Images IMGINDEX.TAB 15423.22
to
15571.04
VG_0015 VG_0015.tar.gz Browse Images IMGINDEX.TAB 15571.06
to
16017.59
VG_0016 VG_0016.tar.gz Browse Images IMGINDEX.TAB 16024.02
to
16212.34
VG_0017 VG_0017.tar.gz Browse Images IMGINDEX.TAB 16212.36
to
16340.10
VG_0018 VG_0018.tar.gz Browse Images IMGINDEX.TAB 16340.11
to
16418.37
VG_0019 VG_0019.tar.gz Browse Images IMGINDEX.TAB 16418.38
to
17373.09
VG_0020 VG_0020.tar.gz Browse Images IMGINDEX.TAB 17373.10
to
19409.44
VG_0021 VG_0021.tar.gz Browse Images IMGINDEX.TAB 19409.47
to
19986.43
VG_0022 VG_0022.tar.gz Browse Images IMGINDEX.TAB 19986.45
to
20325.59
VG_0023 VG_0023.tar.gz Browse Images IMGINDEX.TAB 20326.01
to
20488.08
VG_0024 VG_0024.tar.gz Browse Images IMGINDEX.TAB 20488.11
to
20617.37
VG_0025 VG_0025.tar.gz Browse Images IMGINDEX.TAB 20617.39
to
20863.06
Saturn Encounter
VG_0004 VG_0004.tar.gz Browse Images IMGINDEX.TAB 33575.27
to
43901.56
VG_0005 VG_0005.tar.gz Browse Images IMGINDEX.TAB 43901.59
to
44304.45
VG_0026 VG_0026.tar.gz Browse Images IMGINDEX.TAB 32499.21
to
33562.53
VG_0027 VG_0027.tar.gz Browse Images IMGINDEX.TAB 33562.55
to
34476.28
VG_0028 VG_0028.tar.gz Browse Images IMGINDEX.TAB 34476.32
to
34781.49
VG_0029 VG_0029.tar.gz Browse Images IMGINDEX.TAB 34781.52
to
35028.01
VG_0030 VG_0030.tar.gz Browse Images IMGINDEX.TAB 35028.06
to
35363.02
VG_0031 VG_0031.tar.gz Browse Images IMGINDEX.TAB 35363.06
to
35629.19
VG_0032 VG_0032.tar.gz Browse Images IMGINDEX.TAB 35629.23
to
35893.16
VG_0033 VG_0033.tar.gz Browse Images IMGINDEX.TAB 35893.19
to
42278.08
VG_0034 VG_0034.tar.gz Browse Images IMGINDEX.TAB 42278.14
to
43290.40
VG_0035 VG_0035.tar.gz Browse Images IMGINDEX.TAB 43290.46
to
43579.44
VG_0036 VG_0036.tar.gz Browse Images IMGINDEX.TAB 43579.47
to
43863.41
VG_0037 VG_0037.tar.gz Browse Images IMGINDEX.TAB 43863.44
to
44157.24
VG_0038 VG_0038.tar.gz Browse Images IMGINDEX.TAB 44157.28
to
44304.52
Uranus Encounter
VG_0001 VG_0001.tar.gz Browse Images IMGINDEX.TAB 24476.54
to
26439.58
VG_0002 VG_0002.tar.gz Browse Images IMGINDEX.TAB 26440.04
to
26949.43
VG_0003 VG_0003.tar.gz Browse Images IMGINDEX.TAB 26951.07
to
27628.47
Neptune Encounter
VG_0009 VG_0009.tar.gz Browse Images IMGINDEX.TAB 8966.31
to
10763.59
VG_0010 VG_0010.tar.gz Browse Images IMGINDEX.TAB 10764.06
to
11337.33
VG_0011 VG_0011.tar.gz Browse Images IMGINDEX.TAB 11337.39
to
12230.19
VG_0012 VG_0012.tar.gz Browse Images IMGINDEX.TAB 12230.22
to
12457.33

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