MEX LSK Files ============= This "aareadme.txt" file describes the contents of the kernels/lsk directory. It also provides the file naming conventions used for the MEX LSK kernels, and it provides identification of the most current version of LSK files. The LSK file is modified every time a new Leapsecond is announced by the International Earth Rotation Service (IERS). 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 this kernels. The SPICE toolkit provides versions in Fortran (SPICELIB), C (CSPICE) and IDL (icy), and the user can choose any one that suits him/her. The SPICELIB routine FURNSH, CSPICE function furnsh_c, and icy and mice routine cspice_furnsh load a kernel file into the kernel pool as shown below. CALL FURNSH ( 'kernel_name' ) furnsh_c ( "kernel_name" ); cspice_furnsh, 'kernel_name' cspice_furnsh( 'kernel_name' ) In the case when two or more files contain data overlapping in time for a given object, for binary kernels, the file loaded last takes precedence. 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). All LSK files (*.TLS) contained in this directory are unix text files. These may be used in a non-compatible text environment by using the ASCII mode of FTP to port the file. Contact ESA SPICE Team esa_spice@sciops.esa.int , or Jose Luis Vazquez jlvazquez@sciops.esa.int if you have any questions. References ========== 1. Time Required Reading (NAIF Document). All the NAIF Documents are available at the NAIF web: http://naif.jpl.nasa.gov Mars Express LSK Directory Structure ==================================== aareadme.txt Text file describing the directory structure, the naming conventions for the LSKs, and the current version(s) of each LSK type. former_versions Subdirectory that contains obsolete versions of the LSK files that have been updated in the Current LSK Kernels Set. NAIFvvvv.TLS File storing the occurrences of leapseconds. vvvv is the version number of the file. ------------------- This file was last modified on March 4th, 2009. (J. Vazquez)