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17 January 2002 Optical sensor package for multiangle measurements of surface reflectance
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The Remote Sensing Group of the Optical Sciences Center at the University of Arizona has performed the vicarious calibration of satellite sensors since the 1980's. Ground- based measurements of atmospheric and surface properties, including the surface bidirectional reflectance distribution function (BRDF), are conducted during a satellite or airborne sensor overpass and the at-sensor radiance is calculated using these properties as input to a radiative transfer code. Recently, the Remote Sensing Group has investigated an imaging radiometer based on an astronomical- grade 1024 x 1024-pixel silicon CCD array that was developed and calibrated fro ground-based measurements of BRDF. The results of that study have been used to examine the feasibility of a lightweight instrument package for measurement of surface BRDF based on a combination of nonimaging radiometers and inexpensive digital cameras. The current work presents a preliminary design of such a system including specifications for ground-based operations of the system to characterize the BRDF of test sites used by the Remote Sensing Group. Also included is a preliminary evaluation of a Nikon 990 digital camera coupled with a 1.7- mm focal length fisheye lens to determine the level of accuracy that can be obtained in surface BRDF.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jeffrey S. Czapla-Myers, Kurtis J. Thome, and Stuart F. Biggar "Optical sensor package for multiangle measurements of surface reflectance", Proc. SPIE 4480, Imaging Spectrometry VII, (17 January 2002);


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