Rock fraction effects on the interpretation of microwave emission from soilsThe effects of rock fraction on the relationship between microwave emission and surface soil moisture were investigated through a combination of laboratory dielectric measurements and field observation of emissivity. Field measurements were conducted which included soils with and without rocks. Microwave brightness temperature was measured at L and C band using a truck-mounted radiometer. Dielectric measurements were made at L band. Field observations of emissivity showed that the presence of rocks decreases the range of the measurements. At 21 cm this decrease was relatively small; however, at 6 cm almost all sensitivity to soil moisture was eliminated by the presence of 35 percent rocks. Comparisons between observed and predicted data showed that the effects of rock fraction are not significant in estimating the sample soil moisture for the tested conditions.
Document ID
19920052468
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jackson, Thomas J. (USDA, Hydrology Laboratory, Beltsville MD, United States)
Kostov, Kosta (Bulgarian Academy of Sciences Institute of Electronics, Sofia, Bulgaria)
Saatchi, Sasan S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Earth Resources And Remote Sensing
Meeting Information
Meeting: IGARSS ''91: Annual International Geoscience and Remote Sensing Symposium