PDS_VERSION_ID                = PDS3
RECORD_TYPE                   = STREAM
OBJECT                        = TEXT
  PUBLICATION_DATE            = 2007-10-12
  NOTE                        = "Description of the DATA directory
                                 contents."
END_OBJECT                    = TEXT
END


                   DATA Directory Contents

     The DATA directory contains MOLA AEDR data files with attached
PDS labels. Data are organized into folders of the format AAnnXXX,
where nn is the first two digits of the five-digit orbit number.
Within each folder, the file names have the format AAnnnnnv.B, where
nnnnn is the orbit number and v is a letter representing the product
version.
    MOLA products from the Orbit Insertion Phase of the mission contain
one orbit per file. Mapping Phase products are aggregated by day, so
that one file contains a variable number of orbits. For Mapping Phase
products, the orbit number in the file name and the product ID refers
to the first orbit covered by that product.
     At the beginning of the Mapping Phase the MGS Project chose to
reset the orbit count to 1, starting at the descending equator crossing
of actual orbit 1683. To preserve a unique orbit number for identifying
MOLA products, the MOLA Team adds 10000 to the Project orbit number for
products created during the Mapping Phase.