PDS_VERSION_ID        = PDS3                                          
RECORD_TYPE           = STREAM                                        
                                                                      
OBJECT                = TEXT                                          
  INTERCHANGE_FORMAT    = ASCII                                       
  PUBLICATION_DATE      = 1994-05-13                                  
  NOTE                  = "Description of documentation contained in  
                           the CATALOG directory."                    
END_OBJECT            = TEXT                                          
                                                                      
END                                                                   
                                                                      
The CATALOG directory contains the PDS catalog objects for the        
mission, spacecraft, instruments, and the GVDR data set.  It also     
contains map projection data objects and this file (CATINFO.TXT).     
                                                                      
GVDR_DS.CAT                                                           
===========                                                           
This file contains a DATA_SET object that describes the GVDR data set 
present on this volume.                                               
                                                                      
MISSION.CAT                                                           
===========                                                           
This file contains a MISSION object that describes the Magellan       
mission to Venus.                                                     
                                                                      
PERSONEL.CAT                                                          
============                                                          
This file contains a PERSONNEL object that contains information about 
the institutions and people responsible for generating this volume.   
                                                                      
RDRSINST.CAT                                                          
============                                                          
This file contains an INSTRUMENT object that describes the Magellan   
radar system.  The Magellan radar system acquired the raw data used to
create the GVDR data set.                                             
                                                                      
REFS.CAT                                                              
========                                                              
This file contains a complete set of references mentioned elsewhere in
this directory, each contained in its own REFERENCE object.           
                                                                      
SC_HOST.CAT                                                           
===========                                                           
This file contains an INSTRUMENT_HOST object that describes the       
Magellan spacecraft.                                                  
                                                                      
DSMP.LBL                                                              
========                                                              
This file contains a DATA_SET_MAP_PROJECTION object, one of two       
distinct objects that define the map projection used in creating the  
GVDR images.  (The other associated object that completes the         
definition is the IMAGE_MAP_PROJECTION, which appears in the          
IMPxxxxx.LBL files in this directory.)  The DATA_SET_MAP_PROJECTION   
object describes the three map projections used on this volume:       
Mercator, sinusoidal and stereographic.  This object includes both    
general discussion of the projections and the mathematical relations  
that define them.  The specific parameters used in these mathematical 
relations are given in the IMAGE_MAP_PROJECTION objects.              
                                                                      
IMPNORTH.LBL                                                          
============                                                          
This file contains an IMAGE_MAP_PROJECTION object that gives the map  
projection parameters used in the North Polar Stereographic images in 
the GVDR/NORTH directory.                                             
                                                                      
IMPSOUTH.LBL                                                          
============                                                          
This file contains an IMAGE_MAP_PROJECTION object that gives the map  
projection parameters used in the South Polar Stereographic images in 
the GVDR/SOUTH directory.                                             
                                                                      
IMPSINU.LBL                                                           
============                                                          
This file contains an IMAGE_MAP_PROJECTION object that gives the map  
projection parameters used in the Sinusoidal Equal-Area images in the 
GVDR/SINU directory.                                                  
                                                                      
IMPMERC.LBL                                                           
============                                                          
This file contains an IMAGE_MAP_PROJECTION object that gives the map  
projection parameters used in the Mercator images in the GVDR/MERC    
directory.