header:
  dimensions:
    num_records: 0
  global_attributes:
    acknowledgement: GRACE-FO is a joint mission of the US National Aeronautics and Space Administration and the German Research Center for Geosciences.  Use the digital object identifier provided in the id attribute when citing this data.  See https://podaac.jpl.nasa.gov/CitingPODAAC
    conventions: CF-1.6, ACDD-1.3, ISO 8601
    creator_email: gracefo@podaac.jpl.nasa.gov
    creator_institution: NASA/JPL
    creator_name: GRACE Follow-On Science Data System
    creator_type: group
    creator_url: http://gracefo.jpl.nasa.gov
    date_created: 2026-03-31T16:24:07Z
    date_issued: 2026-04-06T13:49:16Z
    history:
      []
    id: 10.5067/GFJPL-L1A04
    institution: NASA/JPL
    instrument: LRI
    instrument_vocabulary: NASA Global Change Master Directory instrument keywords
    keywords: GRACE-FO, LRI
    keywords_vocabulary: NASA Global Change Master Directory (GCMD) Science Keywords
    license: https://science.nasa.gov/earth-science/earth-science-data/data-information-policy
    naming_authority: org.doi.dx
    platform: GRACE D
    platform_vocabulary: NASA Global Change Master Directory platform keywords
    processing_level: 1A
    product_version: 04
    program: NASA Earth Systematic Missions Program
    project: NASA Gravity Recovery And Climate Experiment Follow-On (GRACE-FO)
    publisher_email: podaac@jpl.nasa.gov
    publisher_institution: NASA/JPL
    publisher_name: Physical Oceanography Distributed Active Archive Center
    publisher_type: group
    publisher_url: http://podaac.jpl.nasa.gov
    references: https://podaac.jpl.nasa.gov/gravity/gracefo-documentation
    source: LRI phase data from GRACE D
    summary: 10-Hz LRI phase measurements
    time_coverage_start: 2000-01-01T12:00:00.00
    time_coverage_stop: 2000-01-01T12:00:00.00
    title: GRACE-FO Level-1A LRI Phase Data
  non-standard_attributes:
    epoch_time: 2000-01-01T12:00:00.00
    software_build_time: 2023-06-21T17:10:46 UTC
    software_version: V04.10.2020-11-09-77-gc5e91-dirty
    start_time_epoch_secs: 0
    stop_time_epoch_secs: 0
  variables:
    - rcv_time:
        comment: 1st column
        coverage_content_type: referenceInformation
        long_name: Seconds past 12:00:00 noon of January 1, 2000 in LRI Time
        units: seconds
    - rcvtime_frac:
        comment: 2nd column
        coverage_content_type: referenceInformation
        long_name: Fractional portion of time tag
        units: nanoseconds
        valid_range: 0, 999999999
    - GRACEFO_id:
        comment: 3rd column
        coverage_content_type: referenceInformation
        long_name: GRACE-FO satellite identifier
        units: char
        valid_range: C,D
        value_meanings:
          - C = GRACE-FO 1 (GRACE C)
          - D = GRACE-FO 2 (GRACE D)
    - prod_flag:
        comment: 4th column
        coverage_content_type: referenceInformation
        flag_masks: 1b, 2b, 4b, 8b, 16b, 32b, 64b, 128b, 256b, 512b, 1024b, 2048b
        flag_meanings:
          - bit 0 = piston_phase
          - bit 1 = phase0_int
          - bit 2 = phase0_frac
          - bit 3 = phase1_int
          - bit 4 = phase1_frac
          - bit 5 = phase2_int
          - bit 6 = phase2_frac
          - bit 7 = phase3_int
          - bit 8 = phase3_frac
          - bit 9 fftSnr
          - bit 10 = noise8_9
          - bit 11 = noise11_12
          - bits 12-15 = Not Defined
        long_name: Product flag, if bit set to 1, value is present in record, bit 0 is rightmost
    - qualflg:
        comment: next column, if prod_flag bit set
        coverage_content_type: qualityInformation
        flag_masks: 1b, 2b
        flag_meanings:
          - bit 0 = Start of new continuous interval after un-fillable phase break
          - bit 1 = Start of new continuous interval after fillable phase gap
          - bits 2-7 = Not defined
        long_name: Quality flag, bit 0 is rightmost
    - piston_phase:
        comment: next column, if prod_flag bit set
        coverage_content_type: referenceInformation
        long_name: Average of 4 photodiode quadrants' phase values
    - phase0_int:
        comment: next column, if prod_flag bit set
        coverage_content_type: physicalMeasurement
        long_name: Upper 32 bits from quadrant0 of photodiode (counts)
    - phase0_frac:
        comment: next column, if prod_flag bit set
        coverage_content_type: physicalMeasurement
        long_name: Lower 32 bits from quadrant0 of photodiode (counts)
    - phase1_int:
        comment: next column, if prod_flag bit set
        coverage_content_type: physicalMeasurement
        long_name: Upper 32 bits from quadrant1 of photodiode (counts)
    - phase1_frac:
        comment: next column, if prod_flag bit set
        coverage_content_type: physicalMeasurement
        long_name: Lower 32 bits from quadrant1 of photodiode (counts)
    - phase2_int:
        comment: next column, if prod_flag bit set
        coverage_content_type: physicalMeasurement
        long_name: Upper 32 bits from quadrant2 of photodiode (counts)
    - phase2_frac:
        comment: next column, if prod_flag bit set
        coverage_content_type: physicalMeasurement
        long_name: Lower 32 bits from quadrant2 of photodiode (counts)
    - phase3_int:
        comment: next column, if prod_flag bit set
        coverage_content_type: physicalMeasurement
        long_name: Upper 32 bits from quadrant3 of photodiode (counts)
    - phase3_frac:
        comment: next column, if prod_flag bit set
        coverage_content_type: physicalMeasurement
        long_name: Lower 32 bits from quadrant3 of photodiode (counts)
    - fftSnr:
        comment: next column, if prod_flag bit set
        coverage_content_type: modelResult
        long_name: Scaled signal amplitude from the FFT core; the signal level without any reference to the noise level
    - noise8_9:
        comment: next column, if prod_flag bit set
        coverage_content_type: physicalMeasurement
        long_name: Noise from transponder heterodyne peak being in the 8-9 MHz band
    - noise11_12:
        comment: next column, if prod_flag bit set
        coverage_content_type: physicalMeasurement
        long_name: Noise from transponder heterodyne peak being in the 11-12 MHz band
# End of YAML header
