MER CK files.
===========================================================================
 
     This ``aareadme.txt'' file describes contents of the kernels/ck
     directory of the MER SPICE data server. It was last modified on June
     28, 2014. Contact Chuck Acton (818-354-3869, Chuck.Acton@jpl.nasa.gov)
     or Boris Semenov (818-354-8136, Boris.Semenov@jpl.nasa.gov) if you
     have any questions regarding this data.
 
 
Brief summary
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     This directory contains the SPICE CK-Kernel files for the MER cruise
     vehicles, rovers, and rover structures. All binary files are in IEEE
     binary format and suitable for ftp binary transfer to use on UNIX
     workstations and MACs. The following files are present in this
     directory. (Only file names are shown; the file name extensions of the
     binary CK files are always ``.bc'', for transfer format CK files are
     always ``.xc'')
 
 
Rover Orientation CK Files
 
     Most current rover orientation CK files:
 
           mer1_surf_rover.bc
           mer1_surf_rover_prim_v1.bc
           mer1_surf_rover_ext*_v1.bc
 
           mer2_surf_rover_all_v1.bc
 
 
PMA Orientation CK Files
 
     Most current PMA orientation CK files:
 
           mer1_surf_pma.bc
           mer1_surf_pma_prim_v1.bc
           mer1_surf_pma_ext*_v1.bc
 
           mer2_surf_pma_all_v1.bc
 
 
IDD Orientation CK Files
 
     Most current IDD orientation CK files:
 
           mer1_surf_idd.bc
           mer1_surf_idd_prim_v1.bc
           mer1_surf_idd_ext*_v1.bc
           mer1_surf_iddg.bc
           mer1_surf_iddg_prim_v1.bc
           mer1_surf_iddg_ext*_v1.bc
 
           mer2_surf_idd_all_v1.bc
           mer2_surf_iddg_all_v1.bc
 
     Note that *_idd_* CKs contain orientation based on telemetered IDD
     joint angles used with the simple rigid forward kinematics model. They
     provide orientation that reflects all IDD motion but does not take
     deflection due to gravity into account. On the other hand, *_iddg_*
     CKs provide gravity compensated orientation for the IDD turret but
     only for times of MI images.
 
 
HGA Orientation CK Files
 
     Most current HGA orientation CK files:
 
           mer1_surf_hga.bc
           mer1_surf_hga_prim_v1.bc
           mer1_surf_hga_ext*_v1.bc
 
           mer2_surf_hga_all_v1.bc
 
 
Cruise CK Files
 
     Most current cruise CK files:
 
           mer1_cruise.bc
           mer2_cruise.bc
 
 
EDL CK Files
 
     No EDL CKs were produced by the MER project.
 
 
Detailed Information Regarding Individual CK Files.
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     Detailed information for each CK file is provided in the comments area
     of the file and can be viewed using SPICE utilities COMMNT and SPACIT.