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  • GEOPHYSICS  (3)
  • 1
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    Some confusion factors in radar image interpretation (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Geologic interpretation of radar imagery for land use applications is discussed with reference to its dependence on classification of the radar return into categories related to some training area within the image. It is shown that such interpretation relies on the assumption that surface characteristics of areas with similar returns are truly similar. It is further shown that this may not always be true over water surfaces due to the influence of system parameters on the radar return. In imagery over land, both system parameters and scene parameters may lead to ambiguous returns which can ultimately lead to misinterpretation.
    Keywords: GEOPHYSICS
    Type: JPL Radar Geol: An Assessment Rept. of the Radar Geol. Workshop; p 223-232
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Measurements from aircraft to characterize watersheds (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Remote sensor measurements of the Southern Plains watershed, an 1130 sq mile segment of the Washita River basin in the Texas Panhandle, are discussed. Soil moisture measurements are emphasized, along with rainfall storage capacity of the soil. Indicators of pond water quality, geologic sources of sediment or salt, and rapid methods of mapping seepage are being searched for through remote sensing.
    Keywords: GEOPHYSICS
    Type: NASA. Manned Spacecraft Center 4th Ann. Earth Resources Program Review, Vol. 5; 14 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Measuring watershed runoff capability with ERTS data (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Parameters of most equations used to predict runoff from an ungaged area are based on characteristics of the watershed and subject to the biases of a hydrologist. Digital multispectral scanner, MSS, data from ERTS was reduced with the aid of computer programs and a Dicomed display. Multivariate analyses of the MSS data indicate that discrimination between watersheds with different runoff capabilities is possible using ERTS data. Differences between two visible bands of MSS data can be used to more accurately evaluate the parameters than present subjective methods, thus reducing construction cost due to overdesign of flood detention structures.
    Keywords: GEOPHYSICS
    Type: PAPER-W7 , NASA. Goddard Space Flight Center 3d ERTS-1 Symp., Vol. 1, Sect. B; p 1089-1098
    Format: text
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    NASA TECHNICAL REPORTS
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