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  • 1975-1979  (8)
  • 1978  (8)
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Keywords
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  • 1975-1979  (8)
Year
  • 1
    Electronic Resource
    Electronic Resource
    SOIL MOISTURE SENSING WITH AIRCRAFT OBSERVATIONS OF THE DIURNAL RANGE OF SURFACE TEMPERATURE (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 14 (1978), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Aircraft Observations of the surface temperature were made by measurements of the thermal emission in the 8-14 μm band over agricultural fields around Phoenix, Arizona. The diuranal range of these surface temperature measurnments were well correlated with the ground measurment of soil moisture in the 0-2 cm layer. The surface temperature indicating no moisture stress. These results indicate that for clear atmospheric conditions remoteley sensed sufrace temperatures can be a reliable indicator of soil moisture conditions and crop status.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1978.tb02135.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    SOIL MOISTURE SENSING WITH AIRCRAFT OBSERVATIONS OF THE DIURNAL RANGE OF SURFACE TEMPERATURE (1978)
    Wiley
    Details
    Publication Date: 1978-02-01
    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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    Remote sensing of surface soil moisture (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The unique thermal and dielectric properties of water afford two possibilities for remotely sensing the moisture content in the surface layer of the soil. Observations of the diurnal range of surface temperature, the microwave brightness temperature (emissivity) and radar backscatter of the soil have shown correlations of up to 0.9 with the moisture in the surface layer (about 5 cm thick). The microwave techniques appear to maintain their sensitivity to moisture variations in the presence of a crop canopy. Observations of microwave brightness temperature from satellite platforms have qualitatively confirmed this sensitivity for a wide range of conditions.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Effect of surface roughness on the microwave emission from soils (1978)
    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. The modification involves introduction of a single parameter to characterize the roughness. It is shown that this parameter depends on both the surface height variance and the horizontal scale of the roughness. Model calculations are in good quantitative agreement with the observed dependence of the brightness temperature on the moisture content in the surface layer. Data from truck mounted and airborne radiometers are presented for comparison. The results indicate that the roughness effects are greatest for wet soils where the difference between smooth and rough surfaces can be as great as 50K.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-79606
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Dielectric constants of soils at microwave frequencies-2 (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The dielectric constants of several soil samples were measured at frequencies of 5 and 19 GHz using the infinite transmission line method. The results of these measurements are presented and discussed with respect to soil types and texture structures. A comparison is made with other measurements at 1.4 GHz. At all three frequencies, the dependence of dielectric constant on soil moisture can be approximated by two straight lines. At low moisture, the slope is less than at high moisture level. The intersection of the two lines is believed to be a function of soil texture.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TP-1238 , G-7802-13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Soil Moisture Workshop (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Soil Moisture Workshop was held at the United States Department of Agriculture National Agricultural Library in Beltsville, Maryland on January 17-19, 1978. The objectives of the Workshop were to evaluate the state of the art of remote sensing of soil moisture; examine the needs of potential users; and make recommendations concerning the future of soil moisture research and development. To accomplish these objectives, small working groups were organized in advance of the Workshop to prepare position papers. These papers served as the basis for this report.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CP-2073 , Jan 17, 1978 - Jan 19, 1978; Beltsville, MD; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Passive microwave studies of snowpack properties (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Microwave brightness temperatures were measured for the snowpacks at Walden and Steamboat Springs, Colorado during 1976 and 1977 aircraft experiments. Variations in measured brightness temperatures are attributed to snow grain and crystal sizes, liquid water content, and snowpack temperature. Results demonstrate that shorter wavelength radiation is scattered more strongly than longer wavelength radiation.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TM-78089 , Western Snow Conf.; Apr 18, 1978 - Apr 20, 1978; Otter Rock, OR; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Studies of snowpack properties by passive microwave radiometry (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Research involving the microwave characteristics of snow was undertaken in order to expand the information content currently available from remote sensing, namely the measurement of snowcovered area. Microwave radiation emitted from beneath the snow surface can be sensed and thus permits information on internal snowpack properties to be inferred. The intensity of radiation received is a function of the average temperature and emissivity of the snow layers and is commonly referred to as the brightness temperature (T sub b). The T sub b varies with snow grain and crystal sizes, liquid water content and snowpack temperature. The T sub b of the 0.8 cm wavelength channel was found to decrease moreso with increasing snow depth than the 1.4 cm channel. More scattering of the shorter wavelength radiation occurs thus resulting in a lower T sub b for shorter wavelengths in a dry snowpack. The longer 21.0 cm wavelength was used to assess the condition of the underlying ground. Ultimately it may be possible to estimate snow volume over large areas using calibrated brightness temperatures and consequently improve snowmelt runoff predictions.
    Keywords: GEOPHYSICS
    Type: NASA-TM-79671
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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