PDS_VERSION_ID            = PDS3
RECORD_TYPE               = FIXED_LENGTH
FILE_RECORDS              = 720
RECORD_BYTES              = 2880
^IMAGE                    = "IEG025A.IMG"

DATA_SET_ID               = "MGS-M-MOLA-5-IEGDR-L3-V2.0"
PRODUCT_ID                = "MOLA-IEG025A.IMG"
SPACECRAFT_NAME           = "MARS GLOBAL SURVEYOR"
INSTRUMENT_ID             = MOLA
INSTRUMENT_NAME           = MARS_ORBITER_LASER_ALTIMETER
TARGET_NAME               = MARS
START_TIME                = 1997-09-15T19:10:00.000
STOP_TIME                 = 2000-06-01T16:51:07.180
START_ORBIT_NUMBER        = 3
STOP_ORBIT_NUMBER         = 15516
PRODUCT_CREATION_TIME     = 2000-07-14T12:00:00.000
PRODUCER_ID               = MGS_MOLA_TEAM
PRODUCER_FULL_NAME        = "DAVID E. SMITH"
PRODUCER_INSTITUTION_NAME = "GODDARD SPACE FLIGHT CENTER"
DESCRIPTION               = "This data product is the reference datum used
   to generate the MOLA topographic maps. The map is in the form of a binary 
   table with one row for each 0.25-degree latitude, from 0 to 360 degrees
   East longitude and 90 to -90 degrees latitude. The datum consists of an
   equipotential surface described by the potential model GMM1.6,
   the Goddard Mars Gravity Model mgm0964c20 evaluated to degree and order
   50.  For this map a value of 3,396,000 meters was selected for the
   radius of the equipotential surface at the equator. (The average radius
   at the equator is currently estimated at 3,396,196 meters.) The areoid
   values are computed at the midpoint of each bin, based on the gravity 
   model. 
      This areoid map is accompanied by a planetary radius map, a topography
   map, and a map showing the number of observations per bin.
      To generate the topography map associated with this areoid map,
   an areoid value is computed at the location of each planetary radius 
   observation in a bin. The areoid value is subtracted from the 
   planetary radius value to obtain the topography at that point. The
   median of the results becomes the topography value for the bin.
      Median values are used for the topography map to better show
   extreme highs and lows. Mean values are used for the planetary radius
   map because they are better for showing the integrated shape."

OBJECT                    = IMAGE
 NAME                     = AREOID_RADIUS
 DESCRIPTION              = "Areoid radius within the 0.25
    by 0.25 degree area, after subtracting 3,396,000 meters.
    Topography is the planetary radius minus the areoid radius at a given
    longitude and latitude."
 LINES                    = 720
 LINE_SAMPLES             = 1440
 SAMPLE_TYPE              = MSB_INTEGER
 SAMPLE_BITS              = 16
 UNIT                     = METER
 SCALING_FACTOR           = 1
 OFFSET                   = 3396000
 MINIMUM                  = -17817
 MAXIMUM                  = 1477
END_OBJECT                = IMAGE

OBJECT                    = IMAGE_MAP_PROJECTION
 ^DATA_SET_MAP_PROJECTION = "DSMAP.CAT"
 MAP_PROJECTION_TYPE      = "SIMPLE CYLINDRICAL"
 A_AXIS_RADIUS            = 3396.0 <KM>
 B_AXIS_RADIUS            = 3396.0 <KM>
 C_AXIS_RADIUS            = 3396.0 <KM>
 FIRST_STANDARD_PARALLEL  = "N/A"
 SECOND_STANDARD_PARALLEL = "N/A"
 POSITIVE_LONGITUDE_DIRECTION = "EAST"
 CENTER_LATITUDE          = 0.0 <DEGREE>
 CENTER_LONGITUDE         = 180.0 <DEGREE>
 REFERENCE_LATITUDE       = "N/A"
 REFERENCE_LONGITUDE      = "N/A"
 LINE_FIRST_PIXEL         = 1
 LINE_LAST_PIXEL          = 720
 SAMPLE_FIRST_PIXEL       = 1
 SAMPLE_LAST_PIXEL        = 1440
 MAP_PROJECTION_ROTATION  = 0.0
 MAP_RESOLUTION           = 4.0 <PIXEL/DEGREE>
 MAP_SCALE                = 14.818 <KM/PIXEL>
 MAXIMUM_LATITUDE         = 90.0 <DEGREE>
 MINIMUM_LATITUDE         = -90.0 <DEGREE>
 WESTERNMOST_LONGITUDE    = 0.0 <DEGREE>
 EASTERNMOST_LONGITUDE    = 360.0 <DEGREE>
 LINE_PROJECTION_OFFSET   = 360.5
 SAMPLE_PROJECTION_OFFSET = 720.5
 COORDINATE_SYSTEM_TYPE   = "BODY-FIXED ROTATING"
 COORDINATE_SYSTEM_NAME   = "PLANETOCENTRIC"
END_OBJECT                = IMAGE_MAP_PROJECTION

END