Viking Lander 2 Release Notes

This file contains release notes concerning the PDS4 migration of the Viking
Lander 2 seismic dataset. The PDS4 dataset includes the seismic data files,
their old PDS3 labels, the new PDS4 labels, documentation, and two products in
the miscellaneous collection.

1. Corrections to PDS3 labels

  A few of the PDS3 labels (*.lbl) in the original dataset had minor errors. In
a few cases the name of fields were wrong, e.g., the field name referred the
wrong seismometer axis. Simmilarly, there were a few cases where the field
descriptions listed the wrong seismometer axis. Another error was for the data
types of data fields where integer values were listed as real values and vice
versa.
 
2. PDS3 catalog files

  The PDS3 catalog files describing the seismic dataset and seismometer
instrument were edited and converted to ASCII text documents. These are included
in document collection. Descriptions of the Viking Lander spacecraft and the
Viking mission are also included and were taken from the Lander image bundle.
 
3. PDS3 "extras" directory

  PDS3 had a concept called "extras" where a dataset could put material in a
directory named extras that was not considered part of the dataset. Extras were
supposed to be items that were not essential to a PDS3 dataset, but could be of
use to data users. Typically material in "extras" was not labeled and could be
in formats not supported by PDS. PDS4 does not have an "extras" concept.
Everything in PDS4 is a product and products require valid PDS4 labels. The PDS3
seismic dataset contains an extras directory with files that are useful to keep
with the PDS4 dataset. PDS4 labels have been created for these and they are
included in either the document or miscellaneous collection.
 
3.A. An example script for plotting seismic data (example_plotting_r_script.txt)
is included in document collection. PDS does not archive software, but will
include source code as documentation to help users access data. As such, this
sample data plotting script was moved from the PDS3 "extras" directory to the
document collection and a PDS4 label is provided.
 
3.B. The PDS3 "extras" also included a list of sampler arm activities for Viking
Lander 2. Movement of the sampler arm could have generated responses in the
seismic data. The list of sampling activities and an explanation of file
contents was moved to the miscellaneous collection and PDS4 labels were created.

4. PDS3 index file

  PDS3 required an index file listing the data files in a dataset. PDS4 does not
require such a file because the collection product has an inventory of members
of each collection. The PDS3 index file in the seismic dataset has little
information that would be helpful for the PDS4 dataset. Thus, it was left out of
the PDS4 dataset version.