Title :
Soil moisture estimation using time-series radar measurements of bare and vegetated fields in Washita ´92
Author :
O´Neill, P.E. ; Hsu, A.Y. ; Shi, J.-C.
Author_Institution :
Lab. for Hydrospheric Processes, NASA Goddard Space Flight Center, Greenbelt, MD, USA
Abstract :
During June, 1992 NASA, USDA, and Princeton University conducted a hydrology field experiment in the Little Washita River watershed near Chickasha, Oklahoma with a goal of characterizing the spatial and temporal variability of soil moisture using microwave sensors. As part of this experiment, several time series of radar images obtained by NASA/JPL´s airborne AIRSAR system over agricultural and pasture test sites were analyzed for their utility to soil moisture estimation. Two existing microwave backscatter models using copolarization ratios which were originally developed for base soils were examined in terms of their performance in the Washita ´92 bare fields and their potential role in a radar-based approach to determining soil moisture through vegetation canopies
Keywords :
backscatter; electromagnetic wave polarisation; electromagnetic wave scattering; geophysical signal processing; hydrological techniques; moisture measurement; radar imaging; remote sensing by radar; soil; AD 1992 06; Chickasha; Little Washita River; Oklahoma; United States; Washita ´92; bare fields; canopies; copolarization ratio; microwave backscatter models; pasture test sites; soil moisture estimation; spatial variability; temporal variability; time-series radar measurements; vegetated fields; Airborne radar; Hydrology; Microwave sensors; NASA; Radar imaging; Radar measurements; Rivers; Soil moisture; System testing; US Department of Agriculture;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1995. IGARSS '95. 'Quantitative Remote Sensing for Science and Applications', International
Conference_Location :
Firenze
Print_ISBN :
0-7803-2567-2
DOI :
10.1109/IGARSS.1995.520319
