Dawn Ceres Gravity Science Derived Data Bundle Readme                                          
                                                                                               
Introduction                                                                                   
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This document contains information pertaining to the Dawn Ceres Gravity Science Derived        
Data Bundle. This bundle contains derived gravity data for the Dawn Radio Science    
Gravity Field Determination experiments during the Ceres encounter, including 
spherical harmonics.
                                                                                               
This bundle is organized into several collections, including:                                  
Dawn Ceres ASCII Spherical Harmonic Models Data Collection                        
(urn:nasa:pds:dawn-rss-der-ceres:data-shadr),                                                      
Dawn Ceres Binary Spherical Harmonic Models Data Collection              
(urn:nasa:pds:dawn-rss-der-ceres:data-shbdr),                                                  
Dawn Ceres Gravity Radio Science Digital Maps Data Collection                              
(urn:nasa:pds:dawn-rss-der-ceres:maps),                                                                                   
and document.                                                                                  
                                                                                               
PDS4 documentation is all XML. There is an XML label for every product in the archive.         
                                                                                               
Dawn Ceres ASCII Spherical Harmonic Models Data Collection                          
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This collection includes ASCII spherical harmonic model of Ceres's gravity field generated by 
the Jet Propulsion Laboratory; these results were derived from raw radio tracking data from 
the Dawn raw radio science data set (DAWN-A-RSS-VEGR-V1.0), observations made using the Dawn
spacecraft and Earth-based receiving stations of the NASA Deep Space Network (DSN).
                                                                                               
Dawn Ceres Binary Spherical Harmonic Models Data Collection             
===========================================================     
This collection includes binary spherical harmonic model of Ceres's gravity field generated by 
the Jet Propulsion Laboratory; these results were derived from raw radio tracking data from 
the Dawn raw radio science data set (DAWN-A-RSS-VEGR-V1.0), observations made using the Dawn
spacecraft and Earth-based receiving stations of the NASA Deep Space Network (DSN).
                                                                                               
Dawn Ceres Gravity Radio Science Digital Maps Data Collection                               
=============================================================                      
This collection includes gravity maps generated by the Jet Propulsion Laboratory; these results
were derived from raw radio tracking data from the Dawn raw radio science data set 
(DAWN-A-RSS-VEGR-V1.0), observations made using the Dawn spacecraft and Earth-based receiving 
stations of the NASA Deep Space Network (DSN).
                                                                                               
This collection's PDS4 map products include value-added updates to upperleft_corner_x/y and 
pixel_resolution_x/y, derived from proper cartographic parameters, provided by Trent Hare 
(PDS Imaging Node). See the accompanying figure equirectangular_map_projection_PDS4.pdf, in 
the document collection, for the method and explanation; these values replace those in the 
earlier PDS3 labels.


Archive Lineage (PDS3 to PDS4)
==============================

This is a PDS4 archive of the following PDS data set:                                         
DAWN-A-RSS-5-CEGR-V4.0                    
                                                                                               
This data set was originally archived under PDS3 in the following volume:                  
DWNCGRS_2                                 
                                                                                               
PDS4 takes advantage of the network capabilities that allow archives to be distributed.  As a  
result, some of the documents and metadata previously stored in the PDS3 catalog files are     
referenced by unique PDS logical identifiers that are included in the document collection      
inventory of this bundle or in the Dawn mission bundle LID=urn:nasa:pds:dawn-mission.          
                                                                                               
Errata                                                                                         
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There are no known errata. An errata file (errata.txt) has been included. If more issues are 
discovered, they will be noted in this file.

Every effort has been made to insure that the data are of the best quality available. However,
users are encouraged to verify the correctness of the data prior to submitting any publications
or other work based on these data and report any issues to PDS/Small Bodies Node.
                                                                                               
Contacts                                                                                       
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For questions or problems regarding this bundle, please contact the PDS Small Bodies           
Node Asteroid Subnode:                                                                         
                                                                                               
  Email             sbn@psi.edu                                                                
