PDS_VERSION_ID                = PDS3
RECORD_TYPE                   = STREAM
OBJECT                        = TEXT
  PUBLICATION_DATE            = 2001-11-15
  NOTE                        = "Description of the DATA directory
                                 contents for the Clementine brightness
                                 temperature archive"
END_OBJECT                    = TEXT
END


The DATA directory contains image files for the Clementine brightness
temperature archive derived from data acquired by the LWIR camera.  In
addition to brightness temperature images, the DATA directory contains
flat field and bad pixel images used in the generation of the
brightness temperature data.  All images have attached PDS labels.
Pixels within the images are 32-bit floating point numbers stored in
least significant byte first order.

The images are stored in subdirectories based on the revolution
number.  Revolution number indicates a data acquisition pass that
started near the South Pole and continued to the North Pole.  There is
one subdirectory for each revolution.  Subdirectory names have the
form REVnnn where nnn is the revolution number.  The brightness
temperature images are further divided into subdirectories based on
the latitude bin scheme described below.  Flat and bad pixel images
for a given revolution number are stored together in a separate
subdirectory named CALIB.  Below is an example of the directory
structure.

     DATA
     |--   REVnnn (where nnn is the revolution number)
           |-- CALIB (for flat field and bad pixel maps)
           |-- A (where A for the latitude bin -90 to -80
           |-- B
           |-- C
           |-- D
           |-- (etc.)

If there are no images within a latitude bin for a given revolution
number, that subdirectory is omitted.

File names for the brightness temperature images use the ISO-9660,
level 2 standard, which allows names longer than 8 characters.  Image
file names have the form BTxxxxynnn.IMG.
         Where: BT = Brightness Temperature
              xxxx = Frame Sequence Number
                 y = Latitude Bin. This character gives a latitude range
                     on the lunar surface where the observation was made.
                     The center latitude defines the character.
                     A = -90 to -80
                     B = -80 to -70
                     C = -70 to -60
                     D = -60 to -50
                     E = -50 to -40
                     F = -40 to -30
                     G = -30 to -20
                     H = -20 to -10
                     I = -10 to   0
                     J =   0 to  10
                     K =  10 to  20
                     L =  20 to  30
                     M =  30 to  40
                     N =  40 to  50
                     O =  50 to  60
                     P =  60 to  70
                     Q =  70 to  80
                     R =  80 to  90
                     S =  unknown targets
                     T =  Earth observations prior to
                          systematic mapping
                     U =  Sky observations prior to
                          systematic mapping
                     V =  Lunar observation prior to
                          systematic mapping
                     W =  Sky observations after
                          systematic mapping
                     Y =  Earth observations after
                          systematic mapping
                     Z =  Lunar observations after
                          systematic mapping

               nnn = Revolution Number

There are up to three flat field and bad pixel images stored in the
CALIB directory for each revolution.  These images are applicable to
the southern latitudes (-90 to -20 degrees), equatorial (-20 to 20
degrees), and northern latitudes (20 to 90 degrees) regions.  File
names for the flat field and bad pixel images have the form of
FFnnnyy.IMG and BPnnnyy.IMG, respectively, where nnn is the revolution
number and yy is the letter code of first and last latitude bin that
applies to the image.