PDS_VERSION_ID      = PDS3                                                    
RECORD_TYPE         = STREAM                                                  
                                                                              
OBJECT      = TEXT                                                            
  NOTE              = " NIS Level 2 Documentation Directory "                 
  PUBLICATION_DATE  =   2001-09-13                                            
END_OBJECT =  TEXT                                                            
                                                                              
END                                                                           
                                                                              
************File DOCINFO.TXT:                                                 
                                                                              
Contains a text description of the contents of the DOCUMENT subdirectory.     
                                                                              
The document subdirectory tree looks like this:                               
                                                                              
                                                                              
File/Directory         Description                                            
====================== ===========                                            
                                                                              
DOCUMENT/                                                                     
  ACRONYMS.TXT          Acronyms used in the NEAR PDS Archive                 
  ACKNOWLG.TXT          Permission for APL Tech Digest articles               
  DOCINFO.TXT           Table of contents for DOCUMENT/ (this file)           
  MISSION.LBL,.PDF,.TXT Mission overview, APL Tech Digest ca. 1998            
  NIS.LBL,.PDF,.ASC     NIS instrument overview, APL Tech Digest ca. 1998     
  NISCAL.LBL,.DOC,.ASC  Calibration procedure documentation                   
  NISCALSW/             Niscal (NIS calibration software) directory           
     AANISCALSW.LBL     Table of contents for NISCALSW/*.PRO                  
     *.PRO              Original Niscal NIS calibration idl procedures + <CR> 
     MANUAL.TXT         Niscal installation and user's manual                 
  NISCALTB/             Niscal calibration data tables' directory             
     AANISCALTB.LBL     Table of contents for NISCALTB/                       
     *.DAT              Original Niscal calibration data i.e. tables + <CR>   
                                                                              
The NISCAL.DOC, NISCAL.ASC and NISCALnn.TIF files contain the NIS instrument  
calibration procedure documentation.  See NISCAL.LBL.                         
                                                                              
The NISCALSW/ subdirectory contains the IDL source code for the Niscal        
program suite, used for calibrating NIS data.  The source code files are      
standard text files with a .PRO extension, which is the standard extension    
for IDL source code.  Some of these files will have line lengths greater      
than 80 characters.  The file MANUAL.TXT explains how to install and          
run Niscal; it is suitable for a user familiar with IDL.                      
                                                                              
This Niscal program can be used as is by users that have IDL, or as           
a template for developing future calibration programs.                        
                                                                              
The NISCALTB/ subdirectory contains the Niscal procedure's data files.        
The data files are duplicated, in PDS format, in the CALIB/ directory, where  
the detached PDS labels have descriptions explaining the contents of each     
file.  Here, the data files are standard text files with a .DAT extension,    
which is the standard extension for IDL input data.  Many of these            
files will have line lengths greater than 80 characters.                      
                                                                              
The Niscal source code, comments in the code, the data files with their       
PDS labels in the CALIB/ directory, and the NIS calibration paper listed      
above are intended as documentation of the current best understanding         
of the NIS instrument's radiometric performance.                              
                                                                              
For more information see also MISSION.CAT, INSTHOST.CAT and NISINST.CAT       
in the CATALOG/ directory.