Comparison of soil moisture penetration depths for several bare soils at two microwave frequencies and implications for remote sensing
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چکیده
منابع مشابه
Comparison of soil moisture penetration depths for several bare soils at two microwave frequencies and implications for remote sensing
Microwave brightness temperature measurements were made over three different bare soils at frequencies of 5 GHz (X = 6 cm) and 1.67 GHz (X = 18 cm) to compare differences in penetration depth according to texture, soil moisture, and wavelength. The soil plots were wetted, and circularly polarized microwave measurements were made during the dry-down cycle. Soil profile temperature and profile mo...
متن کاملMicrowave Remote Sensing of Soil Moisture
Because of the large contrast between the dielectric constant of liquid water and that of dry soil at microwave wavelength, there is a strong dependence of the thermal emission and radar backscatter from the soil on its moisture content. This dependence provides a means for the remote sensing of the moisture content in a surface layer approximately 5 cm thick. The feasibility of these technique...
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Robust estimation of soil moisture using microwave remote sensing depends on extensive ground sampling for calibration and validation of the data. Soil surface sealing is a frequent phenomenon in dry environments. It modulates soil moisture close to the soil surface and, thus, has the potential to affect the retrieval of soil moisture from microwave remote sensing and the validation of these da...
متن کاملComparison of two retrieval methods with combined passive and active microwave remote sensing observations for soil moisture
The brightness temperature (BT) and backscattering coefficient (BSC) measured simultaneously by passive and active microwave sensors have great potential for the estimation of land surface soil moisture (SM). Several methods with combined passive and active microwave remote sensing observations for SM have been reported. Usually, the use of these methods, requires an accurate roughness conditio...
متن کاملMAPSM: A Spatio-Temporal Algorithm for Merging Soil Moisture from Active and Passive Microwave Remote Sensing
Availability of soil moisture observations at a high spatial and temporal resolution is a prerequisite for various hydrological, agricultural and meteorological applications. In the current study, a novel algorithm for merging soil moisture from active microwave (SAR) and passive microwave is presented. The MAPSM algorithm—Merge Active and Passive microwave Soil Moisture—uses a spatio-temporal ...
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ژورنال
عنوان ژورنال: Water Resources Research
سال: 1998
ISSN: 0043-1397
DOI: 10.1029/98wr01469