PDS4 Bundle for the Mars Exploration Rover 2 (Spirit) Navcam 
Calibrated Radiance Data

This bundle contains MER2 (Spirit) Navcam Calibrated Radiance data
migrated from the PDS3 volume.

The bundle contains the following collections:

- Calibrated data collection located in the data directory and its subdirectories.
- Document collection located in the document directory.
- Miscellaneous collection located in the index directory.

Each product in this bundle is described by a PDS4 label in a separate file
with the same name as the file described by the label but with the extension
XML. PDS4 labels are XML (eXtended Markup Language) files that conform to the
PDS4 Information Model XML schema at
https://pds.nasa.gov/pds4/schema/released/. The PDS4 labels are best viewed
in an XML-aware text editor, and may be used by software that can manipulate
XML documents.

Note that the PDS4 labels and other products are merged with the PDS3 volume
such that all the PDS3 files and directories are preserved. But not all of
the PDS3 files have PDS4 labels. For example, the files in the catalog and
software directories, along with a few ancillary PDS3 files were not made
into PDS4 products. Thus, users who want access to the PDS3 labels can
continue to use them. Also, most of the MER documentation is archived in a
separate PDS4 document bundle. Therefore, most documents in this bundle are
listed as secondary members in the document collection. See the document
bundle (urn:nasa:pds:mer_documentation) for the most up to date versions of
MER documents.

Version 1.1: PDS4 labels in the data collection were edited to correct for a
sign error in the instrument and solar elevation angle metadata fields. These
values remain unchanged in the PDS3 labels and embedded VICAR2 headers. For
consistency with other MER2 Navcam bundles, the reference frames for these
angles use a positive elevation up sign convention, although the MER2 SITE
frame is formally defined with positive elevation down. Note also that the
solar elevation angles are affected by the MER time issues documented elsewhere
in this bundle, so may differ from values reported in other MER2 Navcam bundles
by a fraction of a degree.

The Spirit Rover is also known as MER2 (spacecraft serial number) and MERA.

This bundle was created and archived by the Geosciences Node of the Planetary
Data System. Questions about this bundle may be directed to
geosci@wunder.wustl.edu.