Accession Number : AD0872878
Title : The Apparent Temperature and Emissivity of Natural Surfaces at Microwave Frequencies.
Descriptive Note : Technical rept.,
Corporate Author : KANSAS UNIV CENTER FOR RESEARCH INC LAWRENCE
Personal Author(s) : Ulaby, Fawwaz T. ; Fung, Adrian K. ; Wu, Shih-Tseng
Report Date : MAR 1970
Pagination or Media Count : 36
Abstract : The effect of surface roughness on the emissivity of natural surfaces has attained considerable importance in the fields of passive microwave remote sensing of environment and planetary surface emissions. Between the plane surface model and the Lambert surface model, which describe the two extreme cases of a perfectly flat surface and a very rough surface respectively, two statistical surface models have recently been considered: the geometric optics type surface and the physical optics type surface. The paper examines the behavior of the microwave emissivity of some natural surfaces as a function of nadir angle and polarization. This examination includes a comparison between measured and calculated values of the apparent temperature of the ocean surface at 19.4 and 37 GHz.
Descriptors : (*SURFACE TEMPERATURE, MEASUREMENT), (*THERMAL RADIATION, MICROWAVE FREQUENCY), POLARIZATION, OCEAN SURVEILLANCE, SURFACE ROUGHNESS, RADIOMETERS, ATMOSPHERES, EXTRATERRESTRIAL TOPOGRAPHY, EMISSIVITY.
Subject Categories : Test Facilities, Equipment and Methods
Distribution Statement : APPROVED FOR PUBLIC RELEASE