DATA_QUALITY_ID_DESC.TXT                                                      
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V02 - 19/07/07 C. NEHME updapted for SPICAV                                   
V01 - 12/07/07 A. Reberac original for SPICAM                                 
                                                                              
This file describes the data quality which is associated with a particular    
DATA_QUALITY_ID value.                                                        
                                                                              
    Data Quality Flag                                                         
    =================                                                         
      Each data file label includes a quality flag string in the              
      DATA_QUALITY_ID keyword. The eight characters of this field are         
      described below.                                                        
                                                                              
      Definition - Data Quality Index                                         
                c0 = Data Quality Flag (0=good,1=flagged for quality          
                     defects, 2=not yet qualified)                            
                                                                              
      c1 to c7 are different quality defects observed in SPICAV data. Each of 
      these characters is set to 1 if the observation is concerned by the     
      associated quality defect (see definition of each character), or to 0 if
      not concerned.                                                          
                                                                              
                c1 = data are partly satured                                  
                c2 = data are affected by stray light (light from the limb,   
                     light from another source than the main target, or       
                     instrument effect (i.e: light from the wild slit)).      
                c3 = NOT USED for SPICAV                                      
                c4 = data are affected by oscillations.                       
                c5 = bad pointing,                                            
                     satellite manoeuvre not expected during the observation, 
                     or shift of the star spectrum along the wavelength axis. 
                c6 = target missed or observation incomplete (e.g. stellar    
                     occultation observation with star partly or not occulted 
                     by the atmosphere of the planet, or only the occulted    
                     part of the observation available (no star spectrum).    
                     This may be due to a good poiting but :                  
                       - a wrong timing window. During the planning process,  
                         timing window are defined relative to the pericenter.
                         If a change in the orbit occurs (after a safe mode   
                         for example,where an orbit correction manoeuvre is   
                         performed in order to bring the spacecraft to the    
                         nominal free-drift orbit) the relative time of the   
                         pericenter can be shifted by some minutes, and       
                         therefore the target is no more centred in the       
                         timing window.                                       
                       - or a timing window cut during the observation        
                         planning process (conflicts with other instrument,   
                         problem of data volume, violation of illumination    
                         constraints...)                                      
                c7 = missing packets