Accession Number : AD0706517

Title :   EFFECTS OF ROUGHNESS ON EMISSIVITY OF NATURAL SURFACES IN THE MICROWAVE REGION,

Corporate Author : KANSAS UNIV LAWRENCE CENTER FOR RESEARCH IN ENGINEERING SCIENCE

Personal Author(s) : Ulaby,F. T. ; Fung,A. K.

Report Date : 1970

Pagination or Media Count : 5

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. (Author)

Descriptors :   (*TERRAIN, THERMAL RADIATION), (*SURFACES, EMISSIVITY), MICROWAVES, SURFACE ROUGHNESS, RADIOMETERS, MATHEMATICAL MODELS, OCEANS, ATMOSPHERES

Subject Categories : Test Facilities, Equipment and Methods
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE