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  • EARTH RESOURCES AND REMOTE SENSING  (1)
  • SPACECRAFT INSTRUMENTATION  (1)
  • 1980-1984  (2)
  • 1
    Publikationsdatum: 2011-08-18
    Beschreibung: This study represents an attempt to quantitatively assess the capability of a spaceborne radar altimeter to infer ocean surface wind speeds from a measurement of the backscattered power at vertical incidence. The study uses data acquired during 184 near overflights of NOAA data buoys with the GEOS-3 satellite radar altimeter and encompasses a wind-speed range from less than 1 to 18 m/s. An algorithm is derived from the data comparison for converting measurements of the normalized scattering cross section of the ocean surface at 13.9 GHz into estimates of the surface wind speed at the standard anemometer height of 10 m. The algorithm is straightforward and potentially useful for on-board processing of raw altimeter data for the purpose of providing real-time estimates of surface wind speed. For winds in the range of 1 to 18 m/s, the mean difference between the altimeter-inferred winds and the buoy measurements is negligible while the standard deviation of the difference is 1.74 m/s.
    Schlagwort(e): SPACECRAFT INSTRUMENTATION
    Materialart: IEEE Journal of Oceanic Engineering; OE-6; Apr. 198
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2019-07-13
    Beschreibung: Digitally enhanced LANDSAT MSS data were used to discriminate among basalt flows of historical to Tertiary age, at a test site in Northwestern Saudi Arabia. Spectral signatures compared favorably with a field-defined classification that permits discrimination among five groups of basalt flows on the basis of geomorphic criteria. Characteristics that contributed to age definition include: surface texture, weathering, color, drainage evolution, and khabrah development. The inherent gradation in the evolution of geomorphic parameters, however, makes visual extrapolation between areas subjective. Therefore, incorporation of spectrally-derived volcanic units into the mapping process should produce more quantitatively consistent age groupings.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E84-10189 , NASA-TM-86141 , NAS 1.15:86141 , Am. Soc. of Photogrammetry; Sep 09, 1984 - Sep 14, 1984; San Antonio, TX; United States
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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