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Mars radar observations, a preliminary report.

G S Downs, R M Goldstein, R R Green

    Science (New York, N.Y.)
    |December 24, 1971
    PubMed
    Summary
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    Radar mapping of Mars reveals a rugged terrain belt with over 13 km elevation changes. Detailed crater measurements show excellent correlation with high-resolution images, enhancing our understanding of Martian topography.

    Area of Science:

    • Planetary Science
    • Geology
    • Remote Sensing

    Background:

    • Understanding the surface topography of Mars is crucial for geological and astrobiological studies.
    • Previous remote sensing missions have provided lower-resolution topographic data.

    Purpose of the Study:

    • To characterize the detailed topography of a specific rugged region on Mars using radar.
    • To measure elevation differences and analyze crater morphology in the studied area.

    Main Methods:

    • Utilized radar observations to map surface elevations in a narrow belt centered at 16 degrees South latitude on Mars.
    • Measured relative altitudes for nearby points with a precision of up to 40 meters.
    • Analyzed radar data to resolve larger craters, measuring their depth and raised rim heights.

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    Main Results:

    • Identified extremely rugged terrain with elevation differences exceeding 13 kilometers (peak to valley).
    • Achieved high precision (40 meters) for relative altitude measurements of closely spaced points.
    • Demonstrated excellent correlation between radar data and high-resolution photographic imagery for resolved craters.

    Conclusions:

    • Radar remote sensing is effective for detailed topographic mapping of Martian surface features.
    • The studied region exhibits significant geological activity and dramatic elevation changes.
    • Crater dimensions derived from radar data are consistent with visual observations, validating the technique.