General information about SPICE I-kernels
=========================================

   In the SPICE system, I-kernels contains instrument parameters such
   as field-of-view size, shape, and orientation, timing information,
   detector and filter attributes, etc.

   The data contained in I-kernel files can be accessed and manipulated
   by subroutines which are part of the SPICE library, the major
   component of the SPICE Toolkit. The SPICE subroutines can be
   integrated into user application programs. For information on the
   SPICE Toolkit and/or how to obtain it, please consult SPICE_INST.CAT
   and SOFT.CAT.

   Refer to the KERNEL.REQ document provided with the Toolkit to get
   more information on how to access I-kernel data.


Mars Express IK Files                                                         
=====================                                                         
                                                                              
   This file describes the contents of the DATA/IK directory of the Mars
   Express SPICE data set.
                                                                              
   All these IK files are produced manually with the information supplied by
   Mars Express teams describing the science instruments.

   All IK files (*.TI) contained in this directory are UNIX text files
   with lines terminated by <LF> only.


Mars Express I-Kernels Contained in this Data Set
==================================================
                                                                              
   The following I-kernels are provided in this data set (vv refers to the    
   version of the kernel):                                                    
                                                                              
       MEX_ASPERA_Vvv.TI   SPICE Kernel (IK) that contains ASPERA
                           geometry parameters.
                                                                              
       MEX_HRSC_Vvv.TI     SPICE Kernel (IK) that contains the
                           High Resolution Stereo Camera (HRSC)
                           and Super Resolution Channel (SRC)
                           camera optics, detector, and FOV
                           parameters.

       MEX_MARSIS_Vvv.TI   SPICE Kernel (IK) that contains MARSIS
                           geometry, optics, detector and FOV
                           parameters.

       MEX_MELACOM_Vvv.TI  SPICE Kernel (IK) that contains MELACOM
                           instrument FOV parameters.

       MEX_OMEGA_Vvv.TI    SPICE Kernel (IK) that contains the
                           OMEGA Visible and Near InfraRed (VNIR)
                           and Short Wavelength InfraRed (SWIR)
                           Sort wavelength (SWIR-S) and Long
                           wavelength (SWIR-L) channel optics,
                           detector, and field-of-view parameters.
                                                                              
       MEX_PFS_Vvv.TI      SPICE Kernel (IK) that contains PFS
                           geometry, optics, detector, and FOV
                           parameters.

       MEX_SPICAM_Vvv.TI   SPICE Kernel (IK) that contains SPICAM
                           geometry parameters for the instrument
                           UV and IR channels.

       MEX_STR_Vvv.TI      SPICE Kernel (IK) that contains the Star
                           Trackers geometry, optics, detector and
                           FOV parameters.
                                                                              
       MEX_VMC_Vvv.TI      SPICE Kernel (IK) that contains VMC
                           geometry, optics, detector and FOV
                           parameters.
                                                                              

   In the case that several versions of the same instrument kernel are
   provided, the most recent one supersedes the other versions.
                                                                              

Kernel File Details
===================

   The most detailed description of the data in an IK file is provided
   in metadata included inside the description area of the file. This
   information can be viewed using any text editor program.

   At least a basic knowledge of the SPICE system is needed in order to
   use these kernels. The SPICE Toolkit provides versions in Fortran
   (SPICELIB), C (CSPICE), IDL (Icy), Matlab (Mice), and Java
   (JNISpice) and the user can choose any one that suits him/her.

   The SPICE routine FURNSH can be used to load a kernel file into a
   SPICE-based application to make kernel data usable with SPICE
   APIs.

   If two (or more) text kernels assign value(s) using the '=' operator
   to identical keywords, the data value(s) associated with the last
   loaded occurrence of the keyword are used -all earlier values have
   been replaced with the last loaded value(s).