PDS_VERSION_ID      = PDS3                                                    
RECORD_TYPE         = FIXED_LENGTH                                            
RECORD_BYTES        = 80                                                      
OBJECT              = TEXT                                                    
  PUBLICATION_DATE    = 1999-12-29                                            
  NOTE                = "Description of contents of DOCUMENT directory "      
END_OBJECT          = TEXT                                                    
END                                                                           
                                                                              
                                                                              
                                                                              
      The DOCUMENT directory contains documentation on the archival data      
set and files within the data set.                                            
                                                                              
     Each file is in ASCII, most with 80 characters per line.  Each line is   
delimited with a carriage-return (ASCII 13) line-feed (ASCII 10) pair.        
                                                                              
     The files are:                                                           
                                                                              
                                                                              
DOCINFO.TXT                                                                   
                                                                              
     A brief description of the files within the DOCUMENT directory           
(this file).                                                                  
                                                                              
MGSRSSIS.TXT                                                                  
                                                                              
     The Software Interface Specification (SIS) for the Mars Global           
Surveyor (MGS) Raw Data Archive (RDA).  It describes both the format and      
content of the archival data set.                                             
                                                                              
OPTG_SIS.TXT                                                                  
                                                                              
     A brief description of Orbit Propagation and Timing Geometry Files       
(data type OPT), written by the MGS Navigation Team.  It describes both       
the format and content of OPT files created during the MGS Orbit              
Insertion Phase.  There were no OPT files created for Cruise, but this        
document was accidently included at one point and has remained.               
                                                                              
TK_FTP.TXT                                                                    
                                                                              
     Instructions for obtaining NAIF Toolkit software via the Internet.       
Points to documentation on Toolkit organization and use.                      
                                                                              
TK_DESCR.TXT                                                                  
                                                                              
     Description of directory structure and contents of NAIF Toolkit          
delivery for Sun computers.  Description of package for other platforms       
is similar and can be obtained using instructions in TK_FTP.TXT.              
                                                                              
TK_INSTL.TXT                                                                  
                                                                              
     Instructions for installing the NAIF Toolkit on a Sun computer.          
Information for other platforms will be similar and can be obtained using     
instructions in TK_FTP.TXT.                                                   
                                                                              
TRK_2_18.TXT                                                                  
                                                                              
     SIS for the Orbit Data File (ODF), the edited version of closed-loop     
radio tracking data.  This document has not been updated since the ODF        
format changed on 15 April 1997.  Since each ODF is accompanied by a          
full PDS label, TRK_2_18.TXT will not be included with volumes containing     
ODFs produced solely after that date.                                         
                                                                              
TRK_2_21.TXT                                                                  
                                                                              
     SIS for the Earth Orientation Parameter (EOP) file, which contains       
data on rotation of the Earth.                                                
                                                                              
TRK_2_23.TXT                                                                  
                                                                              
     SIS for Media Calibration Files -- Ionosphere Calibration files (ION)    
and Troposphere Calibration files (TRO).                                      
                                                                              
TRK_2_24.TXT                                                                  
                                                                              
     SIS for DSN Weather Files (WEA).  Released version of this document      
is not current; it will not be included with archival volumes until an        
update has been completed.                                                    
                                                                              
TRK_2_25.TXT                                                                  
                                                                              
     SIS for the Archival Tracking Data File (TDF or ATDF), the complete      
file of closed-loop radio tracking data.  This document has not been          
updated since the ATDF format changed on 15 April 1997.  Since each ATDF      
is accompanied by a full PDS label, TRK_2_25.TXT will not be included         
with volumes containing TDFs produced solely after that date.                 
                                                                              
DATAINDX.TAB                                                                  
                                                                              
     A table summarizing special MGS radio science activities between         
Launch (November 1996) and mid-November 1997.  This table indicates when      
tests were conducted, which data were collected, and (very tersely)           
whether there were anomalies.                                                 
                                                                              
DATAINDX.LBL                                                                  
                                                                              
     PDS label for DATAINDX.TAB.