PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2009-10-01 NOTE = "This file describes the files in the extras/mk directory of this volume." END_OBJECT = TEXT END Meta-kernels for the 2001 Mars Odyssey mission ============================================== This directory contains the meta-kernel files (a.k.a "furnsh" files) that provide lists of the archived kernels included in this data set suitable for loading into a SPICE-based application via the high level SPICE data loader routine FURNSH. Using these meta-kernels makes it easy to load with one call a comprehensive SPICE data collection for a given period. Like the text kernels archived in this data set, these meta-kernels are UNIX text files that have lines terminated with a line feed character, LF (ASCII 10). The names of the meta-kernels provided in this directory follow this pattern: m01_YYYY_vVV.tm when ``YYYY'' is the year covered by the kernels listed in the file and ``VV'' is the file version. Multiple versions of a meta-kernel for the same year may exist if new kernels were added to the archive in the later releases and the meta-kernel for that year had to be updated to incorporate them. The reasons for adding new kernels include (but are not limited to) adding new kinds of kernels, adding new versions of existing kernels containing more complete or more accurate data, and adding new versions of existing kernels superseding the existing kernels that had errors. If more than one file for the same year is present, then the file with the latest version supersedes all earlier versions. The latest meta-kernels can be loaded together in any order to provide coverage for more than one year. (Note that on some environments loading too many kernels at once may slow down data access.) Although the meta-kernels were created in such way that on a UNIX workstation they can be loaded into a SPICE-based application directly from the root directory of the data set -- because the PATH_VALUES keyword is set to './data' and '/' is used as the path delimiter -- it is recommended that users make local copies of these files and update the PATH_VALUES keyword in each of them to point to the actual location of the data set's 'data' directory on their system. Additional changes including replacing '/' and '\' in all path specifications and converting UNIX line terminator to terminator native to the user's system maybe require to use these meta-kernels on non-UNIX workstation. The following guidelines were followed to pick and set priority -- determined by the order in which the kernel files are listed, with the latest one taking precedence -- for the kernel files included in these meta-kernels: - the latest archived versions of LSK, PCK, SCLK, IKs, FK, CKs and SPKs were included - both the reconstructed and nominal (nadir and ROTO) orientation spacecraft CKs were included with the reconstructed CKs taking precedence (listed last) and the nominal orientation CKs having lower priority (with nadir CKs having the lowest priority) and used when the reconstructed CKs do not provide coverage. - both the M01 NAV and MGS95J IPNG spacecraft trajectory SPKs were included with the IPNG SPKs taking precedence (listed last) and M01 NAV SPK having lower priority and used when the IPNG SPKs do not provide coverage - no EK files were included due to the low likelihood that EKs would be needed for a SPICE-based application using the M01 SPICE data Contact Information =================== Regarding 2001 Mars Odyssey project specific information provided in this data set and for general information about SPICE system, contact: Boris Semenov (818)-354-8136 Boris.Semenov@jpl.nasa.gov address: Navigation and Ancillary Information Facility (NAIF) Jet Propulsion Laboratory MS 301-125L 4800 Oak Grove Drive Pasadena CA 91109 USA