For remote sensing applications, there is a need for knowledge concerning the reflectance properties of natural and man-made materials as a function of measurement geometry and wavelength. This information is used to determine the so-called bidirectional reflectance distribution function (BRDF). This study is intended to generate an absolute bidirectional reflectance factor for BRDF studies. This is accomplished by development of a goniospectroradiometer which can simulate any source-sensor-target geometry. The spectral range is from visible to near- infrared (2500 nm) with a spectral resolution of 10 nm. The study involves both theoretical and experimental work for calibration of BRDF by: (1) the directional hemispherical reflectance and (2) a NIST calibrated standard reflectance tile. A PTFE sample is calibrated using both methods, and a comparison test was conducted to verify the accuracy. This PTFE sample can be used as a reference standard material to transfer reflectance factor scale to all source-target-sensor geometries in the visible and infrared regions (400 nm to 2500 nm) of the spectrum.
Library of Congress Subject Headings
Reflectance--Analysis; Reflectance--Standards; Earth--Surface--Remote sensing--Analysis
Department, Program, or Center
Chester F. Carlson Center for Imaging Science (COS)
Feng, Xiaofan, "Comparison of methods for generation of absolute reflectance factor measurements for BRDF studies" (1990). Thesis. Rochester Institute of Technology. Accessed from
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