Minimize Dataset Details
Earth Topics (Applications)
Instrument type
  • SCA
  • Mission
    Date of Launch:
    17 February 2002
    Mission Status:
    Mission ended on 27 October 2017
    Orbit Height:
    382 km
    Orbit type:
    GRACE-A and GRACE-B Level-1B Data Product (GA-OG-1B-SCAATT, GB-OG-1B-SCAATT)
    (808) recent views
    Last update: 14 November 2011

    Preprocessed and calibrated star camera quaternion data edited and decimated from instrument high-rate (1 s) to low-rate (5 s) samples for science use (1 file per day, level-1 format).

    GRACE Level-1A Data Products are the result of a non-destructive processing applied to the Level-0 data at NASA/JPL. The sensor calibration factors are applied in order to convert the binary encoded measurements to engineering units. Where necessary, time tag integer second ambiguity is resolved and data are time tagged to the respective satellite receiver clock time. Editing and quality control flags are added, and the data is reformatted for further processing. The Level-1A data are reversible to Level-0, except for the bad data packets. This level also includes the ancillary data products needed for processing to the next data level.

    The Level-1B Data Products are the result of a possibly destructive, or irreversible, processing applied to both the Level-1A and Level-0 data at NASA/JPL. The data are correctly time-tagged, and data sample rate is reduced from the higher rates of the previous levels. Collectively, the processing from Level-0 to Level-1B is called the Level-1 Processing. This level also includes the ancillary data products generated during this processing, and the additional data needed for further processing.

    Processing level
    Level 1b
    How to access this data

    Data are available through GRACE FTP server.

    Terms & Conditions applicable
    Utilisation of this data is subject to the Terms and Conditions for ESA's Third Party Missions scheme


    GRACE L1B Handbook V1.3