SAR-derived soil moisture measurements for bare fieldsThe results of algorithm development and testing for soil moisture retrieval at high incidence angles are reported. Based on first-order surface backscattering models, a physically based algorithm for retrieval of soil moisture has been developed and evaluated using NASA/JPL aircraft SAR (synthetic aperture radar) data. It shows that the co-polarization ratio is sensitive to soil moisture change but not to surface roughness at high incidence angles. This algorithm performed well at L-band and should be useful for repetitive, large-area soil moisture monitoring, without requiring surface roughness measurements. This study suggests that incidence angles greater than 40 deg are optimal for such monitoring.
Document ID
19920052312
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Shi, Jiancheng (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Soares, Joao V. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hess, Laura (California, University Santa Barbara, United States)
Engman, Edwin T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Van Zyl, Jakob J. (JPL Pasadena, CA, 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