PDS_VERSION_ID                    = PDS3                              
LABEL_REVISION_NOTE               = "R.A. SIMPSON, 1999-03-12"        
RECORD_TYPE                       = FIXED_LENGTH                      
RECORD_BYTES                      = 72                                
                                                                      
OBJECT                            = DATA_SET_MAP_PROJECTION           
 DATA_SET_ID                      = "MGS-M-RSS-5-SDP-V1.0"            
 OBJECT                           = DATA_SET_MAP_PROJECTION_INFO      
  MAP_PROJECTION_TYPE             = "SIMPLE CYLINDRICAL"              
  MAP_PROJECTION_DESC             = "                                 
                                                                      
    In the simple cylindrical projection [SNYDER1987], parallels      
    of latitude and meridians of longitude are straight lines that    
    intersect one another at right angles.                            
                                                                      
    Images in this projection are centered on the equator. Map        
    resolution is constant throughout the image, thus increasing      
    distortion away from the poles.                                   
                                                                      
    The transformation from latitude and longitude (LAT, LON) in      
    degrees to LINE and SAMPLE is given by the following equations.   
                                                                      
    SCALE = MAP_RESOLUTION                                            
                                                                      
    SAMPLE = SAMPLE_PROJECTION_OFFSET+SCALE*(LON-CENTER_LONGITUDE)+1  
                                                                      
    LINE = LINE_PROJECTION_OFFSET-SCALE*(LAT-CENTER_LATITUDE)+1       
                                                                      
    In the above definitions, integral values of LINE and SAMPLE      
    correspond to the center of a pixel, and the top left image       
    pixel has LINE=1 and SAMPLE=1. LAT and LON are the latitude and   
    longitude of a given spot on the surface in degrees.              
                                                                      
    LINE_PROJECTION_OFFSET                                            
      is the image line number minus one on which the map projection  
      origin occurs.  The map projection origin is the intersection   
      of the equator and the projection longitude CENTER_LONGITUDE.   
                                                                      
    SAMPLE_PROJECTION_OFFSET                                          
      is the sample number minus one on which the map projection      
      origin occurs.                                                  
                                                                      
    CENTER_LONGITUDE                                                  
      is the value of the projection longitude in degrees, which is   
      typically the longitude that passes through the center of the   
      projection.                                                     
                                                                      
    MAP_RESOLUTION                                                    
      number of pixels per degree at the projection origin."          
                                                                      
  ROTATIONAL_ELEMENT_DESC         = "See [DAVIESETAL1995]."           
                                                                      
  OBJECT                          = DS_MAP_PROJECTION_REF_INFO        
   REFERENCE_KEY_ID               = "DAVIESETAL1995"                  
  END_OBJECT                      = DS_MAP_PROJECTION_REF_INFO        
  OBJECT                          = DS_MAP_PROJECTION_REF_INFO        
   REFERENCE_KEY_ID               = "SNYDER1987"                      
  END_OBJECT                      = DS_MAP_PROJECTION_REF_INFO        
 END_OBJECT                       = DATA_SET_MAP_PROJECTION_INFO      
END_OBJECT                        = DATA_SET_MAP_PROJECTION           
END