Common Data Format (CDF) New Time Variable CDF_TIME_TT2000

Details Common Data Format (CDF) New Time Variable CDF_TIME_TT2000 Common Data Format (CDF) New Time Variable CDF_TIME_TT2000

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm21a2001c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM21A-2001

Physics

[1904] Informatics / Community Standards, [2199] Interplanetary Physics / General Or Miscellaneous, [2499] Ionosphere / General Or Miscellaneous, [2799] Magnetospheric Physics / General Or Miscellaneous

Scientific paper

The Common Data Format (CDF.gsfc.nasa.gov, a project within the Space Physics Data Facility, SPDF.gsfc.nasa.gov) team has defined a new CDF data type, CDF_TIME_TT2000, to provide a standardized and well-defined time scheme for science data, so that data can be accurately compared across missions and used in the future (without misunderstanding and without requiring multiple software routines for conversion). CDF_TIME_TT2000 is defined as an 8-byte signed integer with a fixed time base of J2000 (Julian date 2451545.0 Terrestrial Time (TT) or 2000 January 1, 12h TT), in units and resolution of nanoseconds, and scaled in Terrestrial Time on the rotating Earth Geoid. Routines to convert between UTC and CDF_TIME_TT2000 are provided. This improves on the existing time variable types, CDF_EPOCH and CDF_EPOCH16, since they have undefined time systems (although usually assumed to be in UTC) and times during leap seconds are conflated with the next second. Support for CDF_EPOCH variables will continue, including optional new metadata attributes available for better describing the EPOCH times as used in each dataset. The upcoming CDF version 3.4 will also improve performance and security, with internal compression routines changed to packages with appropriate software licenses.

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