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a comparison of radiative transfer models for predicting the microwave emission from soilsNoncoherent and coherent numerical models for predicting emission from soils are compared. Coherent models use the boundary conditions on the electric fields across the layer boundaries to calculate the radiation intensity, and noncoherent models consider radiation intensities directly. Interference may cause different results in the two approaches when coupling between soil layers in coherent models causes greater soil moisture sampling depths. Calculations performed at frequencies of 1.4 and 19.4 GHz show little difference between the models at 19.4 GHz, although differences are apparent at the lower frequency. A definition for an effective emissivity is also given for when a nonuniform temperature profile is present, and measurements made from a tower show good agreement with calculations from the coherent model.
Document ID
19820027159
Document Type
Reprint (Version printed in journal)
Authors
Schmugge, T. J.
(NASA Goddard Space Flight Center Hydrological Sciences Branch, Greenbelt, MD, United States)
Choudhury, B. J.
(NASA Goddard Space Flight Center Hydrological Sciences Branch, Greenbelt; Computer Sciences Corp., Silver Spring, MD, United States)
Date Acquired
August 10, 2013
Publication Date
October 1, 1981
Publication Information
Publication: Radio Science
Volume: 16
Subject Category
EARTH RESOURCES AND REMOTE SENSING
Distribution Limits
Public
Copyright
Other