PDS_VERSION_ID                 = PDS3

RECORD_TYPE                    = FIXED_LENGTH
RECORD_BYTES                   = 360
FILE_RECORDS                   = 180
^IMAGE                         = "JBL070D1.IBG"

SPACECRAFT_NAME                = "LUNAR PROSPECTOR"
TARGET_NAME                    = "MOON"
INSTRUMENT_NAME                = "RADIO SCIENCE SUBSYSTEM"
DATA_SET_ID                    = "LP-L-RSS-5-GRAVITY-V1.0"
PRODUCT_ID                     = "JBL070D1.IBG"
PRODUCT_RELEASE_DATE           = 1998-03-11
DESCRIPTION                    = "This file contains a digital,
1 X 1 degree resolution map of Bouguer gravity anomalies of
the moon.  It is a 360 x 180 grid from 89.5 to -89.5 degrees
latitude, and -180.0 to 179.0 degrees longitude.  The observation is
Bouguer vertical gravity in milligals at the surface referenced to a
sphere of 1738.0 km radius.  The Bouguer anomaly is the observed gravity
as given by the indicated gravity model minus the theoretical gravity
from the topography model. A crustal density of 2.8 and mean density of
3.34 gm/cm^3 are used together with the GLTM-2C 90th degree and order
topography model (Smith et. al., 1997, Topography of the Moon from the
Clementine Lidar, Journal of Geophysical Research, 102, 1591-1611) to
determine the theoretical gravity.  The degree one terms are not included
and there is no correction for maria fill.  The method of computing the
theoretical gravity of a topography model was done by expanding in powers
(Wieczorek and Phillips, 1998, Potential Anomalies on a Sphere:
Applications to the Lunar Crust, Journal of Geophysical Research, 103,
1715-1724).  The anomaly may be from a truncation in degree of a
delivered gravity field.  The naming convention for the degree used
is, e.g., JBL070D where 70 indicates the maximum degree of the gravity
field used to create the map."

OBJECT                     = IMAGE
  LINES                        = 180
  LINE_SAMPLES                 = 360
  SAMPLE_TYPE                  = UNSIGNED_INTEGER 
  SAMPLE_BITS                  = 8
  UNIT                         = "MILLIGAL"
  OFFSET                       = 873.7
  SCALING_FACTOR               = 6.896
  DESCRIPTION                  = "A byte-scaled image showing the
  Bouguer gravity anomalies of the moon.  The following algorithm
  translates Bouguer gravity to an image DN:
         DN = (BOUGUER GRAVITY <MILLIGALS> + 873.7) / 6.896"
END_OBJECT                 = IMAGE

OBJECT               = IMAGE_MAP_PROJECTION
  ^DATA_SET_MAP_PROJECTION     = "DSMAP.CAT"
  COORDINATE_SYSTEM_TYPE       = "BODY-FIXED ROTATING"
  COORDINATE_SYSTEM_NAME       = PLANETOCENTRIC
  MAP_PROJECTION_TYPE          = "SIMPLE CYLINDRICAL"
  A_AXIS_RADIUS                = 1738.0 <KM>
  B_AXIS_RADIUS                = 1738.0 <KM>
  C_AXIS_RADIUS                = 1738.0 <KM>
  FIRST_STANDARD_PARALLEL      = "N/A"
  SECOND_STANDARD_PARALLEL     = "N/A"
  POSITIVE_LONGITUDE_DIRECTION = "EAST"
  CENTER_LATITUDE              = 0.0 <DEGREES>
  CENTER_LONGITUDE             = -0.5 <DEGREES>
  REFERENCE_LATITUDE           = 0.0 <DEGREES>
  REFERENCE_LONGITUDE          = 0.0 <DEGREES>
  LINE_FIRST_PIXEL             = 1
  LINE_LAST_PIXEL              = 180
  SAMPLE_FIRST_PIXEL           = 1
  SAMPLE_LAST_PIXEL            = 360
  MAP_PROJECTION_ROTATION      = 0.0 <DEGREES>
  MAP_RESOLUTION               = 1.0 <DEGREES>
  MAP_SCALE                    = "N/A"
  MAXIMUM_LATITUDE             = 89.5 <DEGREES>
  MINIMUM_LATITUDE             = -89.5 <DEGREES>
  EASTERNMOST_LONGITUDE        = 179.0 <DEGREES>
  WESTERNMOST_LONGITUDE        = -180.0 <DEGREES>
  LINE_PROJECTION_OFFSET       = 89.5
  SAMPLE_PROJECTION_OFFSET     = 0.0
END_OBJECT           = IMAGE_MAP_PROJECTION

END