Saturday, 22 November 2014

Getting Raw Voyager Data

The main location I'm using for data is http://pds-rings.seti.org/archives/. This provides tar.gz files for a few missions.

To start with let's look at the "raw" Voyager 1 & 2 image archives. These are under VG_0xxx, and there's a "file by file" view  at http://pds-rings.seti.org/vol/VG_0xxx/.

Each compressed volume contains the same layout - at the top level the overview document AAREADME.TXT describes the file layout and content, and the  DOCUMENT/VOLINFO.TXT describes the data format.

Breaking down what appears where it's:
  • Uranus on 1-3
  • Subset of Saturn on 4-5
  • Subset of Jupiter on 6-8
  • Neptune 9-12
  • All of Jupiter 13-25
  • All of Saturn on 26-38
The volumes have a separate subdirectory for each astronomy target,  so one for the planet, one each for the major moons, etc.

For a starter I'll pull down C4394416.IMQ from VG_0005 as a reference file for the next bit of work, which will be to extract the basic file structure and header information.