Data Set Overview
      =================
      This dataset contains a variety of shape models for comet
      67P/Churyumov-Gerasimenko, the target of the Rosetta mission,
      together with the definitions of the coordinate systems for the
      comet.  There are, at this point, two sources of shape models -
      the 3-D Modeling group of the OSIRIS science team and the Flight
      Dynamics team.  Even within the OSIRIS team there are two
      approaches to the shape model, stereophotoclinomtry and
      stereophotogrametry, which are best on different parts of the
      comet.  There are also models created at different times, from the
      earliest models created on approach to the final model that will
      not be created until the end of the mission.  Finally, the
      highest-resolution models are too large for convenient
      manipulation and too detailed for many applications, so the
      dataset includes reduced resolution versions of the high-
      resolution models.  Details are given in the document directory.
      The version number of the dataset will be incremented as
      additional shape models are added to it since not all shape models
      will be available at the initial review of the data.

Confidence Level Overview
      =========================
      The shape models and coordinate systems comprising this data set
      are still in development as of this writing. The final products
      will be reviewed as part of the archiving process.  This
      description is here to act as a placeholder for referencing until
      the data are received, reviewed, and accepted for archiving.

      2015-01-08, A.C.Raugh, NASA PDS Small Bodies Node.