PDS_VERSION_ID        = PDS3                                                  
RECORD_TYPE           = STREAM                                                
OBJECT                = TEXT                                                  
  PUBLICATION_DATE    = 2016-05-06                                            
  NOTE                = "Description of the DOCUMENT directory contents       
                         for the MDIS uncalibrated data archive volume."      
END_OBJECT            = TEXT                                                  
END                                                                           
                                                                              
=====================================================================         
INTRODUCTION                                                                  
=====================================================================         
                                                                              
The DOCUMENT directory contains documentation that is considered to be        
either necessary or useful for users to understand the archive data set.      
Documents may be included in multiple forms (ASCII, PDF, MS Word, HTML        
with image file pointers, etc.). Included are the following documents.        
                                                                              
The DOCUMENT directory also contains a subdirectory, LDD, that contains       
catalog files defining terms in the MESSENGER Local Data Dictionary.          
                                                                              
=====================================================================         
DOCUMENT DIRECTORY                                                            
=====================================================================         
                                                                              
DOCINFO.TXT: Identifies and describes the function of each file in the        
DOCUMENT directory. (This File)                                               
                                                                              
MDISEDRSIS.TXT:  The MDIS EDR SIS: "MERCURY DUAL IMAGING SYSTEM (MDIS)       
EXPERIMENTAL DATA RECORD (EDR) SOFTWARE INTERFACE SPECIFICATION (SIS)         
VERSION 2T" in ASCII text format. Only the text is provided; for             
illustrations, tables, etc. one of the other formats should be                
consulted.                                                                    
                                                                              
MDISEDRSIS.PDF:  The MDIS EDR SIS: "MERCURY DUAL IMAGING SYSTEM (MDIS)       
EXPERIMENTAL DATA RECORD (EDR) SOFTWARE INTERFACE SPECIFICATION (SIS)         
VERSION 2T" in Adobe Acrobat format.  Note that, in contrast to the          
.TXT version, the illustrations, tables, etc. will display                    
appropriately.                                                                
                                                                              
MDISEDRSIS.DOC: The MDIS EDR SIS: "MERCURY DUAL IMAGING SYSTEM (MDIS)        
EXPERIMENTAL DATA RECORD (EDR) SOFTWARE INTERFACE SPECIFICATION (SIS)         
VERSION 2T" in Microsoft Word format.                                        
                                                                              
MDISEDRSIS.LBL: The detached label for the various MDIS EDR SIS files.        

PDSDD.FUL: The PDS Data Dictionary that includes definitions of all
keywords used in MESSENGER data labels, including MESSENGER-specific
keywords (i.e. the MESSENGER Local Data Dictionary). This is a text
file that is human-readable and also usable as input to PDS label
validation software.

Please note the following:

   PDSDD.IDX: Not included in the archive. The data dictionary index 
   file is platform and configuration dependent, therefore it is not
   included in the archive and must be generated by the user using the
   MAKE_INDEX program. This program can be obtained from the PDS 
   software download page at:
   
                 http://pds/tools/software_download.cfm.

   PDSDD.LBL: Not included in the archive. The PDS data dictionary,
   like a catalog file, only contains PDS objects, and thus does not
   require a label.
                                                                              
=====================================================================         
LDD DIRECTORY                                                                 
=====================================================================         
                                                                              
The LDD (Local Data Dictionary) directory contains 72 catalog files           
(*.CAT) each of which defines one term in the MDIS local data                 
dictionary. Each file is named after the term that it defines -               
<TERM>.CAT - containing the ELEMENT_DEFINITION object for that term. The      
underscores were removed from the file names due to a difficulty with         
the archiving software being used.                                            

===================================================================== 

The instrument paper:

  Hawkins, S. E., III, J. Boldt, E. H. Darlington (all at JHU/APL), R.
  Espiritu (ACT), R. E. Gold, B. Gotwols, M. Grey (both at JHU/APL), C.
  Hash (ACT), J. Hayes, S. Jaskulek, C. Kardian, M. Keller (all at
  JHU/APL), E. Malaret (ACT), S. L. Murchie, P. Murphy, K. Peacock, L.
  Prockter, A. Reiter (all at JHU/APL), M. S. Robinson (Northwestern
  Univ.), E. Schaefer, R. Shelton, R. Sterner, H. Taylor (all at
  JHU/APL), T. Watters (NASM), and B. Williams (JHU/APL), The Mercury
  Dual Imaging System on the MESSENGER spacecraft, Space Science
  Reviews, 131, 247-338, 2007. [HAWKINSETAL2007]

should be consulted in conjunction with using data in this archive.