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  • 1975-1979  (5)
  • 1960-1964
  • 1977  (5)
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  • 1975-1979  (5)
  • 1960-1964
Year
  • 1
    Electronic Resource
    Electronic Resource
    SATELLITE MICROWAVE OBSERVATIONS OF SOIL MOISTURE VARIATIONS (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 13 (1977), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Results from studies in the Illinois-Indiana and Texas-Oklahoma areas indicate that satellite microwave observations at the 1.55 cm wavelength are responsive to relative moisture variations in the near surface layer of the soil. Because significant vegetation cover absorbs the 1.55 cm microwave emission from the soil, the target area must be predominately bare soil or low density vegetation cover for meaningful measurements to result. The 25 km resolution of the satellite sensor limits application of the microwave techniques to large areas such as watersheds or agricultural districts rather than individual fields. In general, at 1.55 cm. there is an inverse relationship between microwave brightness temperature and changes in soil moisture levels (as indicated by antecedent rainfall) in agricultural regions before the planting of crops or during the early growing season when vegetation cover is sparse. Even early season observations should be of great value in deciding on the time and type of crop planting and for initial irrigation scheduling when the root zone is still in close proximity to the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1977.tb02023.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    SATELLITE MICROWAVE OBSERVATIONS OF SOIL MOISTURE VARIATIONS (1977)
    Wiley
    Details
    Publication Date: 1977-04-01
    Print ISSN: 1093-474X
    Electronic ISSN: 1752-1688
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley
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    PAPER CURRENT
  • 3
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    Effect of surface roughness on the microwave brightness temperature of soils (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effect of surface roughness on the brightness temperature of a moist terrain was studied through the modification of Fresnel reflection coefficient and using the radiative transfer equation. Model calculations are in good qualitative agreement with the observed dependence of the brightness temperature on the moisture content in the surface layer.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-71282 , X-913-76-265
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Microwave radiometry for soil moisture sensing (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Investigations have been conducted with truck-mounted radiometers to study the variation of microwave emissivity from a soil. It was found that the longer wavelength radiometers, (21 cm), are preferable for the remote sensing of soil moisture. Aircraft observations indicated a nonlinear dependence of microwave brightness temperature on soil moisture. The dielectric constants of soils are considered along with the radiative transfer in soils, and soil water characteristics. A description is presented of test flights conducted with a NASA aircraft, taking into account soil moisture measurements and instrumentation. The obtained results show that the surface emissivity of a soil is determined by the dielectric properties of the surface soil layer a few tenths of a wavelength thick while the thermal sampling depths are much greater. The capability of the 21-cm radiometer to sense soil-moisture variations through a moderate vegetation canopy, and the promising Skylab results encourage consideration of a radiometer operating at this wavelength for routine soil moisture observations.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Workshop on Remote sensing of soil moisture and groundwater; Nov 08, 1976 - Nov 10, 1976; Toronto; Canada
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Soil moisture sensing with aircraft observations of the diurnal range of surface temperature (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Aircraft observations of the surface temperature were made by measurements of the thermal emission in the 8-14 micrometers band over agricultural fields around Phoenix, Arizona. The diurnal range of these surface temperature measurements were well correlated with the ground measurement of soil moisture in the 0-2 cm layer. The surface temperature observations for vegetated fields were found to be within 1 or 2 C of the ambient air temperature indicating no moisture stress. These results indicate that for clear atmospheric conditions remotely sensed surface temperatures are a reliable indicator of soil moisture conditions and crop status.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TM-X-71274 , X-913-77-13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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