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Definition
(1) Data specifically associated with the instrument, either because it was generated by the instrument or included in data packets identified with that instrument. These data consist of instrument science and engineering data, and possibly ancillary data. Instrument engineering data is produced by engineering sensor(s) of an instrument, used either for operating the instrument or for processing the science data generated by the instrument. Instrument science data is produced by the science sensor(s) of an instrument, usually constituting the basis reason for existence of an instrument.
(2) Data created by an instrument including scientific measurements and any engineering orancillary data which may be included in the data packets.
(3) Data produced and transmitted by the science and engineering sensors of an instrument, and, in the spacecraft environment, any additional data packaged with the instrument’s sensor data by virtue of services provided by the spacecraft carrying the instrument.
Source
CEOS-WGISS Document: Auxiliary Data in the CEOS Community: Reference Guidelines Document Part 1: Current Usage (1996) accessible at wgiss.ceos.org/archive/archive.doc/ads200part1.doc
CEOS EO Data Stewardship Glossary
NESDIS Data Management Lexicon and Related Terms
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