PDS_VERSION_ID                = PDS3                                          
/* label standards identifiers PDS Version 3.8 */                             
                                                                              
/* File Characteristics */                                                    
RECORD_TYPE                   = FIXED_LENGTH                                  
RECORD_BYTES                  = 68                                            
FILE_RECORDS                  = 110                                           
MD5_CHECKSUM                  = "0792fc932f98bbbc608ba02705b22b7f"            
                                                                              
/* Pointers to Data Objects */                                                
^TABLE                        = "GRD_HYDROGEN_MAP.TAB"                        
PRODUCER_FULL_NAME            = "PRETTYMAN"                                   
PRODUCER_INSTITUTION_NAME     = "PLANETARY SCIENCE INSTITUTE"                 
                                                                              
/* Identification Data Elements */                                            
MISSION_NAME                  = "DAWN MISSION TO VESTA AND CERES"             
MISSION_ID                    = "DAWN"                                        
MISSION_PHASE_NAME            = "CERES SCIENCE LAMO (CSL)"                    
TARGET_NAME                   = "1 CERES"                                     
TARGET_TYPE                   = "ASTEROID"                                    
INSTRUMENT_HOST_NAME          = "DAWN"                                        
INSTRUMENT_HOST_ID            = "DAWN"                                        
INSTRUMENT_ID                 = "GRAND"                                       
INSTRUMENT_NAME               = "GAMMA-RAY AND NEUTRON DETECTOR"              
DATA_SET_ID                   = "DAWN-A-GRAND-5-CERES-HYDROGEN-MAP_V1.0"      
DATA_SET_NAME = "DAWN GRAND MAP CERES HYDROGEN MAP V1.0"                      
PRODUCT_ID                    = "GRD_HYDROGEN_MAP"                            
PRODUCT_TYPE                  = "DATA"                                        
PRODUCT_VERSION_ID            = "1.0"                                         
START_TIME                    = 2015-12-16T01:01:10                           
STOP_TIME                     = 2016-05-11T00:57:37                           
SPACECRAFT_CLOCK_START_COUNT  = "0503499737.000"                              
SPACECRAFT_CLOCK_STOP_COUNT   = "0516200397.000"                              
PRODUCT_CREATION_TIME         = 2017-09-24T14:13:42                           
                                                                              
/* Data Object Definitions */                                                 
OBJECT                        = TABLE                                         
 ROWS                         = 110                                           
 ROW_BYTES                    = 68                                            
 COLUMNS                      = 7                                             
 INTERCHANGE_FORMAT           = ASCII                                         
 DESCRIPTION                  ="                                              
    A global map of the concentration of hydrogen within the regolith of      
    asteroid 1 Ceres on twenty-degree quasi-equal-area pixels is provided.    
    Hydrogen concentrations were determined from thermal+epithermal neutron   
    counting data acquired by the NASA Dawn mission's Gamma Ray and Neutron   
    Detector (GRaND) while in low altitude mapping orbit, about 385 km from   
    Ceres' surface (about 0.8 body radii altitude).  The concentrations are   
    representative of Ceres's bulk  regolith to depths up to a few decimeters 
    with a spatial resolution of about 600-km full-width-at-half-maximum of   
    arc length on the surface. The methods used to determine hydrogen         
    concentration are described by PRETTYMANETAL2017.                         
  "                                                                           
                                                                              
 OBJECT                       = COLUMN                                        
  NAME                        = "PIXEL_INDEX"                                 
  DATA_TYPE                   = ASCII_INTEGER                                 
  START_BYTE                  = 1                                             
  BYTES                       = 10                                            
  FORMAT                      = "I10"                                         
  DESCRIPTION                 = "                                             
    Pixel index. The map covers -90 to 90 degrees latitude and -180 to 180    
    degrees east longitude. Pixels are indexed from west to east and from     
    south to north, starting with 0.                                          
   "                                                                          
 END_OBJECT                   = COLUMN                                        
                                                                              
 OBJECT                       = COLUMN                                        
  NAME                        = "MIN_LAT"                                     
  DATA_TYPE                   = ASCII_REAL                                    
  UNIT                        = "deg"                                         
  START_BYTE                  = 11                                            
  BYTES                       = 7                                             
  FORMAT                      = "F7.1"                                        
  DESCRIPTION                 = "                                             
    Pixel latitude southernmost boundary.                                     
   "                                                                          
 END_OBJECT                   = COLUMN                                        
                                                                              
 OBJECT                       = COLUMN                                        
  NAME                        = "MAX_LAT"                                     
  DATA_TYPE                   = ASCII_REAL                                    
  UNIT                        = "deg"                                         
  START_BYTE                  = 18                                            
  BYTES                       = 7                                             
  FORMAT                      = "F7.1"                                        
  DESCRIPTION                 = "                                             
    Pixel latitude northernmost boundary.                                     
   "                                                                          
 END_OBJECT                   = COLUMN                                        
                                                                              
 OBJECT                       = COLUMN                                        
  NAME                        = "MIN_LON"                                     
  DATA_TYPE                   = ASCII_REAL                                    
  UNIT                        = "deg"                                         
  START_BYTE                  = 25                                            
  BYTES                       = 7                                             
  FORMAT                      = "F7.1"                                        
  DESCRIPTION                 = "                                             
    Pixel east longitude westernmost boundary.                                
   "                                                                          
 END_OBJECT                   = COLUMN                                        
                                                                              
 OBJECT                       = COLUMN                                        
  NAME                        = "MAX_LON"                                     
  DATA_TYPE                   = ASCII_REAL                                    
  UNIT                        = "deg"                                         
  START_BYTE                  = 32                                            
  BYTES                       = 7                                             
  FORMAT                      = "F7.1"                                        
  DESCRIPTION                 = "                                             
    Pixel east longitude easternmost boundary.                                
   "                                                                          
 END_OBJECT                   = COLUMN                                        
                                                                              
 OBJECT                       = COLUMN                                        
  NAME                        = "H_CONC"                                      
  DATA_TYPE                   = ASCII_REAL                                    
  UNIT                        = "wt.% WEH"                                    
  START_BYTE                  = 39                                            
  BYTES                       = 14                                            
  FORMAT                      = "E14.4"                                       
  DESCRIPTION                 = "                                             
    Hydrogen concentration with units of weight percent water equivalent      
    hydrogen (wt.% WEH).                                                      
   "                                                                          
 END_OBJECT                   = COLUMN                                        
                                                                              
 OBJECT                       = COLUMN                                        
  NAME                        = "SIG_H_CONC"                                  
  DATA_TYPE                   = ASCII_REAL                                    
  UNIT                        = "wt.% WEH"                                    
  START_BYTE                  = 53                                            
  BYTES                       = 14                                            
  FORMAT                      = "E14.4"                                       
  DESCRIPTION                 = "                                             
    1-sigma uncertainty in hydrogen concentration.                            
   "                                                                          
 END_OBJECT                   = COLUMN                                        
                                                                              
END_OBJECT                    = TABLE                                         
END