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Remote sensing of ocean currents.

R M Goldstein, H A Zebker, T P Barnett

    Science (New York, N.Y.)
    |December 8, 1989
    PubMed
    Summary
    This summary is machine-generated.

    A new synthetic aperture radar (SAR) method accurately measures ocean surface currents. This remote sensing technique shows potential for global ocean current monitoring.

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    Area of Science:

    • Oceanography
    • Remote Sensing
    • Geophysics

    Background:

    • Accurate measurement of ocean currents is crucial for understanding ocean dynamics and climate.
    • Conventional methods for measuring surface currents can be labor-intensive and provide limited spatial coverage.

    Purpose of the Study:

    • To introduce and validate a novel remote sensing technique for measuring near-surface ocean currents using synthetic aperture radar (SAR).

    Main Methods:

    • Utilized a single SAR transmitter and two receiving antennas to capture interferometric SAR image scenes.
    • Analyzed the phase difference between SAR scenes to generate an interferogram directly proportional to surface current velocity.

    Main Results:

    • Field tests demonstrated the SAR technique's accuracy, with root-mean-square errors of 5-10 cm/s for mean flows of 27-56 cm/s (approximately 20% accuracy).

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    Conclusions:

    • The developed SAR interferometry method offers a promising, accurate, and remote approach for measuring ocean surface currents.
    • With potential for space-based implementation, this technique could enable routine global monitoring of ocean surface currents.