PDS_VERSION_ID            = PDS3
RECORD_TYPE               = FIXED_LENGTH
FILE_RECORDS              = 1440
RECORD_BYTES              = 5760
^IMAGE                    = "IEG0125R.IMG"

DATA_SET_ID               = "MGS-M-MOLA-5-IEGDR-L3-V2.0"
PRODUCT_ID                = "MOLA-IEG0125R.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 a planetary radius
   map of Mars at a resolution of 0.125 by 0.125 degrees, based on
   altimetry data acquired by the Mars Global Surveyor MOLA
   instrument and accumulated over the course of the mission so far.
   The MOLA Precision Experiment Data Records (PEDRs) are the source
   for this data set. The map is in the form of a binary table with
   one row for each 0.125-degree latitude, from 0 to 360 degrees East
   longitude and 90 to -90 degrees latitude. The binned
   data include all MOLA nadir observations from the Mapping Phase,
   from the end of aerobraking through June 2000. Additionally, off-nadir
   observations of the north pole are included from 87 N latitude and
   northward, taken during the spring of 1998, and of both poles taken
   during Mapping from 87 N and S to the poles. Parts of orbits
   are excluded where solutions for these orbits are deemed to be poor.
   Also excluded are shots more than 1 degree off-nadir (except as noted
   above), channel 4 returns, and any returns not classified as ground 
   returns, e.g. clouds or noise, according to the SHOT_CLASSIFICATION_CODE.
   A total of approximately 333 million observations are represented.
      In this map, the value in each bin is the mean of the planetary 
   radius measurements that fall within the bin.
      This radius map is accompanied by a topography map, an areoid map,
   and a map showing the number of observations per bin.
      To generate the topography map associated with this radius 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.
      Note that MOLA uses a different orbit numbering scheme from that
   used by the MGS Project. The Project reset its orbit counter to 1 at
   the beginning of the Mapping Phase. Since MOLA had already generated
   products identified by orbit number prior to the Mapping Phase,
   it was decided to use the Project orbit number plus 10000 to identify
   MOLA Mapping Phase products, thereby avoiding duplicate product IDs.
   Subtract 10000 from a MOLA mapping phase orbit number to determine 
   the equivalent MGS Project orbit number. Since the MOLA topographic data
   are cumulative over the whole mission, the orbit number range for these
   products spans both the Orbit Insertion and Mapping Phases. "

OBJECT                    = IMAGE
 NAME                     = MEAN_RADIUS
 DESCRIPTION              = "Mean observed planetary radius within the 0.125
    by 0.125 degree area, after subtracting 3,396,000 meters (the mean radius
    at the equator).  Where no observations lie within the area,
    an interpolated value is supplied."
 LINES                    = 1440
 LINE_SAMPLES             = 2880
 SAMPLE_TYPE              = MSB_INTEGER
 SAMPLE_BITS              = 16
 UNIT                     = METER
 SCALING_FACTOR           = 1
 OFFSET                   = 3396000
 MINIMUM                  = -23071
 MAXIMUM                  = 21269
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          = 1440
 SAMPLE_FIRST_PIXEL       = 1
 SAMPLE_LAST_PIXEL        = 2880
 MAP_PROJECTION_ROTATION  = 0.0
 MAP_RESOLUTION           = 8.0 <PIXEL/DEGREE>
 MAP_SCALE                = 7.409 <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   = 720.5
 SAMPLE_PROJECTION_OFFSET = 1440.5
 COORDINATE_SYSTEM_TYPE   = "BODY-FIXED ROTATING"
 COORDINATE_SYSTEM_NAME   = "PLANETOCENTRIC"
END_OBJECT                = IMAGE_MAP_PROJECTION

END