The Data Raw Collection Description


PDS_VERSION_ID       = PDS3                                                   
RECORD_TYPE          = FIXED_LENGTH                                           
RECORD_BYTES         = 80                                                     
INSTRUMENT_HOST_NAME = "NEAR EARTH ASTEROID RENDEZVOUS"                       
OBJECT               = TEXT                                                   
  PUBLICATION_DATE   = 2012-02-24                                             
  NOTE               = "AAREADME.TXT File for data set:                       
                        NEAR-A-XRS-2-EDR-EROS/ORBIT-V1.0"                     
END_OBJECT           = TEXT                                                   
                                                                              
END                                                                           
                                                                              
In Feb. 2012 this data set was reorganized from the physical volume format    
into a more contemporary single logical volume, so that X-ray and Gamma-ray   
data are now in separate volumes.  Index files have been edited to reflect    
the new volume IDs. The description below is from the AAREADME.TXT file of    
one of the original volumes.  The new structure contains all the listed       
directories under a single root.                                              
                                                                              
-A.C.Raugh 2012-02-24                                                         
_______________________________________________________________               
                                                                              
NEAR Mission X-RAY/GAMMA-RAY SPECTROGRAPH Data Set                            
========================================================================                          
       
   Introduction                                                                  
  ============                                                                  
                                                                              
   This document provides an overview of this volume of this Near Earth       
   Asteroid Rendezvous (NEAR) Uncalibrated Data Set, including a summary      
   of the volume contents.                                                    
                                                                                                                     
                                                                              
   NEAR data sets contain data from only one instrument and one mission phase.
   Mission phases for data sets are defined in the table below. Each data     
   set contains the data from a range of days and all supporting directories. 
   The data sets may span multiple volumes. The GEOMETRY data containing the SPICE   
   ephemerides, attitude and other files are delivered in a separate data set 
   covering the same phase.                                                   
                                                                                  
                                                                         



                                                                       
    Data Set Overview                                                         
    =================                                                         
      This data set contains X-Ray Spectrometer (XRS) observations            
      made during the third cruise phase of the NEAR mission. The             
      individual observations are combined into a single file per day         
      for each sensor.                                                        
                                                                              
                                                                              
    Parameters                                                                
    ==========                                                                
      The data are presented as FITS binary tables (using the BINTAB          
      extension) with detached PDS labels. The parameters listed in           
      each table vary with observing sensor. The detailed descriptions        
      of the various parameters included in the table are given in a          
      separate documentation file, one for each sensor:                       
                                                                              
         xrs_definitions.txt                                                  
         xrf_definitons.txt                                                   
                                                                              
                                                                              
    Data                                                                      
    ====                                                                      
      The data are in the form of FITS files with attached FITS headers       
      and detached PDS labels.  The data subdirectory has subdirectories      
      for each instrument sensor.  Files contain all data for one day.   
     
                                                                              
    Ancillary Data                                                            
    ==============                                                            
      Geometry data (pointing and attitude information) are provided          
      for the entire NEAR mission as a separate data set.                     
                                                                              
                                                                                      
                                                                              
                                                                              
    Processing History                                                        
    ==================                                                        
      The processing history includes no background, noise, geometry or       
      other corrections."                                                     


 Mission Phase Parameters (Planned Values; Feb. 2000)                          
 ====================================================                          
                                                                              
 1) Phase Name                                                                 
 2) Segment(Phase Abbrv)                                                       
 3) Start Year, DayOf Year                                                     
 4) End Year, DayOf Year,                                                      
 5) Length(days)                                                               
 -------------------------------------------------------                       
                                                                              
 CRUISE1                CRU1      1996051      1997175    491                  
 MATHILDE               MATH      1997176      1997178      3                  
 CRUISE2                CRU2      1997179      1998022    209                  
 EARTH                  ERTH      1998023      1998026      4                  
 CRUISE3                CRU3      1998027      1998356    330                  
 EROS/FLY/BY            ERFB      1998357      1998357      1                  
 CRUISE4                CRU4      1998358      2000010    383                  
 EROS/ORBIT             EROS      2000011      2001043    399                  
 EROS/SURFACE           ERSF      2001044      2001059     16                  
                                                                              
 -------------------------------------------------------      

                                 
                                                                              
    Data Quality Flag                                                         
    =================                                                         
      Each observation includes a quality flag in the column named 'DQI'.     
      This flag was extracted from the FITS keyword NEAR-008 of the           
      original data label. The fields of this keyword are defined             
      below.  Data quality defects flag is raised when there is missing       
      data other fields informational and not quality related. The eight      
      characters of this field are described below.                           
                                                                              
      Definition - Data Quality Index                                         
                c0 = Data Quality Flag (0=good,1=flagged for quality          
                     defects)                                                 
                c1 = Instrument number for FC, CTP and AIU (1 or 2)           
                c2 - c6 = Processing Flags not quality related                
                c7 = CCDS Source (0=VC0, 1=VC1, 2=VC2, 3=VC3)                 
                                                                              
    Review                                                                    
    ======                                                                    
      This data set underwent external peer review within PDS in June,        
      2000."                                                                  
                                                                              
  END_OBJECT                       = DATA_SET_INFORMATION                     
                                                                              
  OBJECT                           = DATA_SET_TARGET                          
    TARGET_NAME                    = "SOLAR SYSTEM"                           
  END_OBJECT                       = DATA_SET_TARGET                          
                                                                              
  OBJECT                           = DATA_SET_HOST                            
    INSTRUMENT_HOST_ID             = "NEAR"                                   
    INSTRUMENT_ID                  = "XRS"                                    
  END_OBJECT                       = DATA_SET_HOST                            
                                                                              
  OBJECT                           = DATA_SET_REFERENCE_INFORMATION           
    REFERENCE_KEY_ID               = "CHENGETAL1998"                          
  END_OBJECT                       = DATA_SET_REFERENCE_INFORMATION           
                                                                              
END_OBJECT                         = DATA_SET                                 
END