DAWN Shape Data for Ceres 
=========================

This file was last updated on 13-MAR-2015 by Nat Bachman (JPL/NAIF).

This directory contains Ceres shape data in text format.
Each text file corresponds to a DSK file provided by Nickolaos 
Mastrodemos (JPL). The source DSK files are

   ceres_opnav5_128.bds
   ceres_opnav5_256.bds
   ceres_opnav5_512.bds

The text files are

   ceres_opnav5_128.txt.gz
   ceres_opnav5_256.txt.gz
   ceres_opnav5_512.txt.gz

These are gzipped versions of text files with Unix 
line terminators.

The format of the text files is described below.



Plate Data File Type 1 (Plate-Vertex Table)
--------------------------------------------------------
 
   The data input file consists of two sections, the first for vertex data,
   the second describing the plate-vertex mapping.
 
 
      N
      1 X(1) Y(1) Z(1)
      2 X(2) Y(2) Z(2)
 
            ...
 
      N X(N) Y(N) Z(N)
      M
      1 V1(1) V2(1) V3(1)
      2 V1(2) V2(2) V3(2)
 
            ...
 
      M V1(M) V2(M) V3(M)
 
   where
 
         N                              is the number of vertices listed in
                                        the file.
 
         1 through N                    are the indices of the plate model
                                        vertices, provided as the first
                                        space-separated item on the file
                                        lines 2 through (N+1).
 
         X(i) Y(i) Z(i)                 are the body-fixed Cartesian
                                        coordinates of the plate model
                                        vertices, provided for each vertex
                                        as the 2nd, 3rd, and 4th
                                        space-separated items on lines 2
                                        through (N+1).
 
         M                              is the number of plate-vertex
                                        mappings in the file.
 
         1 through M                    are the indices of the plate model
                                        plates, provided as the first
                                        space-separated item on the file
                                        lines (N+3) through (N+M+2).
 
         V1(i) V2(i) V3(i)              are the indices of the plate model
                                        vertices for the corners of a given
                                        plate, provided for each plate as
                                        the 2nd, 3rd, and 4th
                                        space-separated items on lines
                                        (N+3) through (N+M+2).
 
 
Sample Plate-Vertex Table Input File
 
 
         12
         1 0. 0. 1.17557
         2 0.32492 1. 0.525731
         3 1.05146 0. 0.525731
         4 -0.850651 0.618034 0.525731
         5 -0.850651 -0.618034 0.525731
         6 0.32492 -1. 0.525731
         7 0.850651 0.618034 -0.525731
         8 -0.32492 1. -0.525731
         9 -1.05146 0. -0.525731
         10 -0.32492 -1. -0.525731
         11 0.850651 -0.618034 -0.525731
         12 0. 0. -1.17557
         20
         1 1 3 2
         2 1 2 4
         3 1 4 5
         4 1 5 6
         5 1 6 3
         6 3 7 2
         7 2 8 4
         8 4 9 5
         9 5 10 6
         10 6 11 3
         11 7 8 2
         12 8 9 4
         13 9 10 5
         14 10 11 6
         15 11 7 3
         16 7 12 8
         17 8 12 9
         18 9 12 10
         19 10 12 11
         20 11 12 7