Title :
Attenuation of soil microwave emission by corn and soybeans at 1.4 and 5 GHz
Author :
Jackson, Thomas J. ; O´Neill, P.E.
Author_Institution :
USDA-ARS Hydrology Lab., Beltsville, MD, USA
fDate :
9/1/1990 12:00:00 AM
Abstract :
Theory and experiments have shown that passive microwave radiometers can be used to measure soil moisture. However, the presence of a vegetative cover alters the measurement that might be obtained under bare conditions. Two significant obstacles to the practical use of this approach are deterministically accounting for the effect of vegetation; and developing algorithms for extracting soil moisture from observations of a vegetation-soil complex. The presence of a vegetation canopy reduces the sensitivity of passive microwave instruments to soil moisture variations. Data collected using truck-mounted microwave radiometers were used to examine the specific effects of corn and soybean canopies
Keywords :
agriculture; electromagnetic wave absorption; hydrological techniques; microwave measurement; moisture measurement; radiometry; remote sensing; soil; 1.4 to 5 GHz; L-band microwave data; SHF; UHF; corn; microwave emission attenuation; microwave instruments sensitivity; microwave optical depth; microwave remote sensing; passive microwave radiometers; radiometry; single scattering albedo; soil microwave emission; soybean canopies; vegetation canopy; vegetation water content; vegetation-soil complex; vegetative cover; Attenuation; Data mining; Instruments; Microwave measurements; Microwave theory and techniques; Moisture measurement; Radiometers; Soil measurements; Soil moisture; Vegetation;
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
