PDS_VERSION_ID               = PDS3                                           
RECORD_TYPE                  = FIXED_LENGTH                                   
RECORD_BYTES                 = 2880                                           
FILE_RECORDS                 = 181                                            
^IMAGE                       = ("JGD75C60.IMG",1)                             
INSTRUMENT_HOST_NAME         = "MARS GLOBAL SURVEYOR"                         
TARGET_NAME                  = "MARS"                                         
INSTRUMENT_NAME              = "RADIO SCIENCE SUBSYSTEM"                      
DATA_SET_ID                  = "MGS-M-RSS-5-SDP-V1.0"                         
ORIGINAL_PRODUCT_ID          = "MGS75C.ANOMALY"                               
PRODUCT_ID                   = "JGD75C60.IMG"                                 
PRODUCT_RELEASE_DATE         = 1999-12-01                                     
DESCRIPTION                  = "                                              
                                                                              
 This file contains a digital map of the geoidal gravity anomaly derived      
 from the MGS75C model of the Mars gravity field.  Each point gives the       
 Mars gravity anomaly in milligals, which is the difference of the model      
 gravity on the geoid from the normal gravity on a reference ellipsoid        
 with semi-major-axis = 3397.0 km, GM = 42828.35796 km**3/s**2,               
 flattening = 5.079304192e-3, and rotation rate = 7.088218081e-5 rad/s.       
 The JGD75C60 gravity anomaly is computed from a truncated MGS75C             
 solution (from degree 2 up to degree 60).  'GD' in the file name             
 indicates it is Gravity anomaly Data, '75C' denotes the MGS75C model         
 solution used, and '60' indicates the maximum degree of the field            
 used to create the map.                                                      
                                                                              
 The map was produced by the Mars Global Surveyor Gravity Science Team        
 at JPL under the direction of William L. Sjogren.                            
                                                                              
 NB: START_ORBIT_NUMBER in keywords below is counted from Mars Orbit          
 Insertion in September 1997.  The MGS Project reset its orbit count          
 at the beginning of Mapping in early March 1999; STOP_ORBIT_NUMBER           
 includes the effect of that reset."                                          
                                                                              
START_ORBIT_NUMBER           = 202                                            
STOP_ORBIT_NUMBER            = 2993                                           
START_TIME                   = 1998-03-28T00:00:00                            
STOP_TIME                    = 1999-11-08T14:00:00                            
SOFTWARE_NAME                = "GRVMAP;V1.0"                                  
PRODUCT_CREATION_TIME        = 1999-12-01T00:00:00                            
PRODUCER_ID                  = "MGS GRAVSCI TEAM"                             
                                                                              
OBJECT               = IMAGE                                                  
  LINES                      = 181                                            
  LINE_SAMPLES               = 360                                            
  SAMPLE_TYPE                = "IEEE REAL"                                    
  SAMPLE_BITS                = 64                                             
  UNIT                       = "MILLIGAL"                                     
  OFFSET                     = 0.0E+00                                        
  SCALING_FACTOR             = 1.0E+00                                        
  DESCRIPTION                = "The Digital Map contains                      
   values of the geoidal gravity anomaly.  The values can be obtained         
   by multiplying the sample in the map by SCALING_FACTOR and then            
   adding OFFSET.  One milligal equals 0.01 mm/s/s."                          
END_OBJECT           = IMAGE                                                  
                                                                              
OBJECT               = IMAGE_MAP_PROJECTION                                   
  ^DATA_SET_MAP_PROJECTION     = "DSMAP2.CAT"                                 
  COORDINATE_SYSTEM_TYPE       = "BODY-FIXED ROTATING"                        
  COORDINATE_SYSTEM_NAME       = PLANETOCENTRIC                               
  MAP_PROJECTION_TYPE          = "SIMPLE CYLINDRICAL"                         
  A_AXIS_RADIUS                = 3397.0 <KM>                                  
  B_AXIS_RADIUS                = 3397.0 <KM>                                  
  C_AXIS_RADIUS                = 3397.0 <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              = 181                                          
  SAMPLE_FIRST_PIXEL           = 1                                            
  SAMPLE_LAST_PIXEL            = 360                                          
  MAP_PROJECTION_ROTATION      = 0.0 <DEGREES>                                
  MAP_RESOLUTION               = 1.0E+00                                      
  MAP_SCALE                    = "N/A"                                        
  MAXIMUM_LATITUDE             = 90.0 <DEGREES>                               
  MINIMUM_LATITUDE             = -90.0 <DEGREES>                              
  EASTERNMOST_LONGITUDE        = 179.0 <DEGREES>                              
  WESTERNMOST_LONGITUDE        = -180.0 <DEGREES>                             
  LINE_PROJECTION_OFFSET       = 0.0                                          
  SAMPLE_PROJECTION_OFFSET     = 0.0                                          
END_OBJECT           = IMAGE_MAP_PROJECTION                                   
                                                                              
END