12 October 1988 Accounting For Diffuse Irradiance On Reference Reflectance Panels
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Abstract
Measurements of surface reflectance factors in the field are usually made under conditions of total (direct and diffuse) irradiance. However, the reference panel reflectance factor R(r/e) used to convert the target measurement to reflectance is frequently determined using only direct irradiance. A method for determining the diffuse-irradiance reflectance factor, 11,1.4(0°,/e), of a calibrated field-reference panel from a knowledge of the direct-irrA.ance reflectance factor, Rd.,(0°,/0), is described. The magnitude of the error involved if only the direct irradiance reflectance factor is known, usually from laboratory calibration, was found to vary from -2% to +5%, depending on zenith angle, atmospheric conditions, and the particular reflectance panel used.
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Ray D Jackson, Ray D Jackson, Philip N Slater, Philip N Slater, M.Susan Moran, M.Susan Moran, } "Accounting For Diffuse Irradiance On Reference Reflectance Panels", Proc. SPIE 0924, Recent Advances in Sensors, Radiometry, and Data Processing for Remote Sensing, (12 October 1988); doi: 10.1117/12.945692; https://doi.org/10.1117/12.945692
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