PDS_VERSION_ID      = PDS3                                                    
RECORD_TYPE         = "STREAM"                                                
                                                                              
OBJECT              = TEXT                                                    
   PUBLICATION_DATE = 2010-09-10                                              
   NOTE             = "Description of the contents of the CALIB/ directory"   
END_OBJECT          = TEXT                                                    
                                                                              
END                                                                           
                                                                              
CALIB Directory Contents                                                      
                                                                              
This file describes the contents of the calibration directory.  The EPOXI     
calibration pipeline uses the files in this directory to calibrate raw data   
from the EPOXI mission; many of the files are duplicates of those for Deep    
Impact.  The files are derived from analysis of pre-launch thermal-vacuum     
data as well as from in-flight calibrations performed during the Deep Impact  
and EPOXI missions.  For more information about these files, the analyses,    
and the calibration pipeline, see the Deep Impact instrument calibration      
paper included on the Deep Impact and EPOXI documentation data set,           
DI-C-HRII/HRIV/MRI/ITS-6-DOC-SET-V3.0.                                        
                                                                              
The calibration data are provided as FITS image files or ASCII tables.        
The following file naming convention is used:                                 
                                                                              
  CCCCC/IIIIII_YYMMDD_V_M_FFF.{FIT,TAB}                                       
  |     |      |      | | |                                                   
  |     |      |      | | Optional filter number (1 through 9), temperature,  
  |     |      |      | | or place holder value such as '999'                 
  |     |      |      | |                                                     
  |     |      |      | Instrument image mode (1 through 9) or a place        
  |     |      |      | holder value of '0' to indicate all modes             
  |     |      |      |                                                       
  |     |      |      File version number (1, 2, etc.) for the given          
  |     |      |      effective date                                          
  |     |      |                                                              
  |     |      Date from which file is effective.  It is not the file         
  |     |      creation date.  A value of '020601' indicates the file was     
  |     |      created from pre-launch thermal-vacuum data.  The value        
  |     |      '000101' is used as a place holder.  It provides no useful     
  |     |      information but is required to keep the pipeline running.      
  |     |                                                                     
  |     Instrument designation (e.g. MRIVIS for MRI)                          
  |                                                                           
  Directory for the type of calibration file (e.g. FLAT for flat fields)      
                                                                              
Here is an example of a complete file name, FLAT/MRIVIS_020601_2_1_9.FIT:     
                                                                              
    - FLAT     Flat field                                                     
    - MRIVIS   MRI Instrument                                                 
    - 020601   Effective date of 2002-06-01; this flat can be applied         
               to data acquired on 2002-06-01 UTC or later                    
    - 2        Version 2 of the file for the specified effective date         
    - 1        Instrument image mode 1                                        
    - 9        Filter 9                                                       
    - .FIT     FITS file                                                      
                                                                              
Calibration files are grouped into subdirectories by type:                    
                                                                              
  ABSCALVS                                                                    
  --------                                                                    
  This subdirectory contains ASCII text tables of the absolute calibration    
  constants for all instrument (image) modes.  The first column in a table    
  specifies the constant for converting raw data numbers to units of          
  radiance, W/(m**2 sr um).  The second column specifies the constant for     
  converting from units of radiance to units of reflectance (i.e., I-over-F   
  or the observed radiance over the input solar radiance, unitless).          
                                                                              
  ADCLUT                                                                      
  ------                                                                      
  This subdirectory contains a look up table for the correction of uneven     
  bit weighting caused by the analog-to-digital conversion.  The single       
  table applies to all instrument modes.  As of this archive, the             
  corrections had not been derived.  Therefore, the input pixel values are    
  the same as the output values to prevent the automated calibration          
  pipeline from changing the data.                                            
                                                                              
  BADPIX                                                                      
  ------                                                                      
  This subdirectory contains maps that identify bad pixels for all            
  instrument modes.  Bad pixels are set to a value of 1. Good pixels are      
  set to 0.  Pixels in the serial and parallel overclock columns and rows     
  are flagged as good (0).  For each image mode, there is one row of warm     
  pixels near the top and bottom edge.  These rows are flagged as bad (1).    
                                                                              
  BIAS                                                                        
  ----                                                                        
  This subdirectory contains bias correction maps for all instrument          
  modes.                                                                      
                                                                              
  DECOMPRS                                                                    
  --------                                                                    
  This subdirectory contains the four 8-bit lookup tables used to             
  decompress raw data numbers.                                                
                                                                              
  DRKMODEL                                                                    
  --------                                                                    
  This subdirectory contains master dark frames for all instrument            
  modes.                                                                      
                                                                              
  FILTERS                                                                     
  -------                                                                     
  This subdirectory contains one transmission profile table for each          
  MRI filter.                                                                 
                                                                              
  FLAT                                                                        
  ----                                                                        
  This subdirectory contains flat fields for every combination of             
  instrument mode and filter.                                                 
                                                                              
  PSF                                                                         
  ---                                                                         
  This subdirectory contains a dummy point-spread function file for each      
  filter.  It is a centered delta function to prevent the pipeline from       
  changing the data.                                                          
                                                                              
  XTALK                                                                       
  -----                                                                       
  This subdirectory contains FITS files that specify the amount of gain       
  from electronic cross talk that occurs between all possible                 
  combinations of the four quadrants of the CCD.  There is one file           
  for each instrument mode.                                                   
                                                                              
Icon  Name                                      Last modified      Size  Description
[DIR] Parent Directory - [DIR] abscalvs/ 19-Feb-2009 23:07 - [DIR] adclut/ 21-Feb-2009 20:45 - [DIR] badpix/ 03-Sep-2009 13:09 - [DIR] bias/ 22-Feb-2009 23:56 - [DIR] decomprs/ 22-Feb-2009 23:58 - [DIR] drkmodel/ 24-Feb-2009 23:36 - [DIR] filters/ 01-Mar-2009 21:57 - [DIR] flat/ 29-Jun-2009 12:25 - [DIR] psf/ 08-Aug-2010 01:26 - [DIR] xtalk/ 02-Sep-2009 15:19 - [TXT] calinfo.txt 09-Sep-2010 14:37 9.6K
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