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- W2019932566 abstract "Microwave radiometry has been used for the remote sensing of soil moisture in a series of aircraft flights over an agricultural test area in the vicinity of Phoenix, Arizona, The radiometers covered the wavelength range 0.8–21 cm. Ground truth in the form of gravimetric measurements of the soil moisture in the top 15 cm were obtained for 200 fields at this site. The results indicate that it is possible to monitor soil moisture variations with airborne radiometers. The emission is a function of the radiometer wavelength and the distribution of the moisture in the soil. At a wavelength of 1.55 cm there is little or no variation in the emission for soil moisture values below 10 or 15% moisture content by weight. Above this value there is a linear decrease in the emission with a slope of approximately 3°K for each percentage point increase in soil moisture. On the other hand, the emission was observed to be a linear function of soil moisture over the range 0–35% at a wavelength of 21 cm. Results of calculations using a layered model are presented that indicate the importance of the surface moisture in determining the emission from the soil." @default.
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- W2019932566 date "1974-01-10" @default.
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- W2019932566 title "Remote sensing of soil moisture with microwave radiometers" @default.
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