PDS_VERSION_ID        = PDS3                                                  
RECORD_TYPE           = FIXED_LENGTH                                          
RECORD_BYTES          = 80                                                    
OBJECT                = TEXT                                                  
  INTERCHANGE_FORMAT    = ASCII                                               
  PUBLICATION_DATE      = 1999-11-23                                          
  NOTE                  = "N/A"                                               
END_OBJECT            = TEXT                                                  
                                                                              
END                                                                           
                                                                              
                            Mars Global Surveyor                              
                        Accelerometer Raw Data Archive                        
                       (MGS-M-ACCEL-0-ACCEL_DATA-V1.0)                        
                                                                              
                              AAREADME.TXT                                    
                            23 November 1999                                  
                               L.F. Huber                                     
                       New Mexico State University                            
                                                                              
                                                                              
==============================================================================
INTRODUCTION                                                                  
==============================================================================
                                                                              
     This compact disc contains archival accelerometer results from the Mars  
Global Surveyor (MGS) mission.  This disc includes raw data from Aerobraking  
Phases 1 and 2. Volume MGSA_0002 will include reduced data. The               
archive was prepared under standards of the Planetary Data System (PDS).      
                                                                              
                                                                              
==============================================================================
VOLUME SET INFORMATION                                                        
==============================================================================
                                                                              
     The diagram below shows the organization of this volume, starting from   
the root of the compact disc.                                                 
                                                                              
           root                                                               
            |                                                                 
            |- AAREADME.TXT          The file you are reading.                
            |                                                                 
            |- ERRATA.TXT            A listing of known errors/problems on    
            |                        this volume. (Not present if empty.)     
            |                                                                 
            |- VOLDESC.CAT           A description of the contents of this    
            |                        CD_ROM volume in a format readable by    
            |                        both humans and computers.               
            |                                                                 
            |                                                                 
            |- [CALIB]               A directory containing calibration       
            |     |                  information.                             
            |     |                                                           
            |     |- CALINFO.TXT     Description of files in this directory.  
            |     |                                                           
            |     |- AERODYN.TAB     File of aerodynamic properties of MGS.   
            |     |                                                           
            |     |- AERODYN.FMT     Column descriptions of AERODYN.TAB.      
            |     |                                                           
            |     |- SC_DATA.TAB     File of physical properties of MGS.      
            |                                                                 
            |- [CATALOG]             A directory containing information       
            |     |                  about the data set                       
            |     |                                                           
            |     |- CATINFO.TXT     Description of files in this directory.  
            |     |                                                           
            |     |- INSTHOST.CAT    Description of the MGS spacecraft.       
            |     |                                                           
            |     |- INST.CAT        Description of the MGS Accelerometer.    
            |     |                                                           
            |     |- DATASET.CAT     Descriptions of the raw data set.        
            |     |                                                           
            |     |- MISSION.CAT     Description of the MGS mission.          
            |     |                                                           
            |     |- PERSON.CAT      A listing of the people involved in the  
            |     |                  production of this data set and          
            |     |                  this CD-ROM.                             
            |     |                                                           
            |     |- REF.CAT         A list of pertinent references.          
            |                                                                 
            |- [DOCUMENT]            A directory containing related documents.
            |     |                                                           
            |     |- DOCINFO.TXT     Description of files in this directory.  
            |     |                                                           
            |     |- SIS_ACC.TXT     SIS document for the data set.           
            |     |                                                           
            |     |- PERIALTS.PS     Plot of periapsis altitude vs. orbit #.  
            |     |                                                           
            |     |- JSR.ASC         ASCII version of JSR paper.              
            |     |                                                           
            |     |- JSR*.TIF        TIFF format figures from JSR paper.      
            |                                                                 
            |- [INDEX]               A directory containing an index of data  
            |     |                  files on this volume                     
            |     |                                                           
            |     |- INDXINFO.TXT    Description of files in this directory.  
            |     |                                                           
            |     |- INDEX.TAB       An index of data files on this volume.   
            |     |                                                           
            |     |- INDEX.LBL       The PDS label describing INDEX.TAB.      
            |                                                                 
            |- [LABEL]               A directory containing files with        
            |     |                  repeated label information.              
            |     |                                                           
            |     |- LABINFO.TXT     Description of files in this directory.  
            |     |                                                           
            |     |- *.FMT           Format files describing table structures.
            |                                                                 
            |- [DATA]                A directory containing the raw data files
            |   |                    and PDS labels describing the contents   
            |   |                    of those files.                          
            |   |                                                             
            |   - [P##XX]            Divided into subdirectories by orbit     
            |      |                 number.                                  
            |      - [P####]                                                  
            |         |                                                       
            |         - COUNTS.TAB      Accelerometer counts.                 
            |         |                                                       
            |         - ORBELEM.TAB     Orbital elements at periapsis.        
            |         |                                                       
            |         - RATEQUAT.TAB    Angular rates and quaternions.        
            |         |                                                       
            |         - THRUSTER.TAB    Thruster on times.                    
            |                                                                 
                                                                              
More information on the organization of the CD can be found in the Software   
Interface Specification (SIS) for the data set in the DOCUMENT directory.     
                                                                              
                                                                              
==============================================================================
DISC FORMAT                                                                   
==============================================================================
                                                                              
     This disc has been formatted so that a variety of computer systems       
(e.g. IBM PC, Macintosh, Sun, VAX) may access the data.  Specifically,        
the disc is formatted according to the ISO 9660 level 1 Interchange           
Standard.  For further information, refer to the ISO 9660 Standard            
Document: RF# ISO 9660-1988, 15 April 1988.                                   
                                                                              
     The disc is organized according to the PDS standard for "one data set,   
one volume."  This file (AAREADME.TXT), a PDS volume object definition        
(VOLDESC.CAT), and the listing of errors and changes (ERRATA.TXT) are         
included at the root level.  The following directories of descriptive         
material are also at the root level:                                          
                                                                              
          CATALOG   contains descriptive files for cataloging the data        
                    on this disc.                                             
                                                                              
          DOCUMENT  contains a plain text Software Interface Specification    
                    (SISs) for the data set and other documentation.          
                                                                              
          INDEX     contains index information (table of contents) on each of 
                    the data files included in this disc.                     
                                                                              
                                                                              
==============================================================================
FILE FORMAT                                                                   
==============================================================================
                                                                              
     All data files on the disc are accompanied by attached PDS labels, which 
describe their contents.  PDS TEXT objects have attached labels.              
                                                                              
     Text files, including data files of ASCII text and all labels (*.LBL     
files) and tables (*.TAB files), are delimited with carriage-return (ASCII 13)
line-feed (ASCII 10) pairs at the end of each line.  Detached labels and text 
files (*.TXT file names) have fixed length records of 80 bytes to facilitate  
their use as either fixed-length record files or as stream files with         
carriage-return line-feed delimiters.                                         
                                                                              
                                                                              
==============================================================================
SOFTWARE                                                                      
==============================================================================
                                                                              
     No software is included with this data set.                              
                                                                              
                                                                              
==============================================================================
PEER REVIEW                                                                   
==============================================================================
                                                                              
    This volume has completed a peer review by the PDS. The peer review       
panel consisted of Robert Tolson and Gerry Keating from the Accelerometer     
team, Lyle Huber, Jim Murphy and Joel Wilf representing PDS, Richard Springer 
from the Mars Surveyor Project, and Julio Magalhaes, Steve Bougher and Jeff   
Hollingsworth as external reviewers.                                          
                                                                              
                                                                              
==============================================================================
CITATION INFORMATION                                                          
==============================================================================
                                                                              
    Users wishing to cite this volume in publications should adopt the        
following as the method of citation:                                          
          G.M. Keating, R.H. Tolson, S.N. Noll, R.F. Beebe and L.F. Huber,    
          Volume MGSA_0001, NASA Planetary Data System, 1999.                 
                                                                              
==============================================================================
DISCLAIMER                                                                    
==============================================================================
                                                                              
     Although considerable care has gone into making this volume set, errors  
are possible.  Reports of errors or difficulties would be appreciated.  Please
contact one of the persons listed below.                                      
                                                                              
                                                                              
==============================================================================
COGNIZANT PERSONNEL                                                           
==============================================================================
                                                                              
Lyle F. Huber                                                                 
New Mexico State University                                                   
Department of Astronomy                                                       
P.O. Box 30001/MSC 4500                                                       
Las Cruces, NM 88003                                                          
Tel: 505-646-1862                                                             
FAX: 505-646-1602                                                             
lhuber@nmsu.edu