Comparison of BRDF results from two different scatterometers for instrument validation in support of satellite instrumentation

Jinan Zeng; James J. Butler; Xiaoxiong Xiong

doi:10.1117/12.2636162

30 September 2022 Comparison of BRDF results from two different scatterometers for instrument validation in support of satellite instrumentation

Jinan Zeng, James J. Butler, Xiaoxiong Xiong

Author Affiliations +

Proceedings Volume 12232, Earth Observing Systems XXVII; 1223202 (2022) https://doi.org/10.1117/12.2636162
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

Two scatterometers at NASA GSFC Diffuser Calibration Lab (DCL) are used to realize the Bidirectional Reflectance Distribution Function (BRDF) scale transfer from a small NIST traceable BRDF lab standard sample to large-area solar diffuser panels in support of the calibration of remote sensing instruments. The capability of measuring the BRDF of large area solar diffuser panels has been realized by developing a large-area collimated uniform light source and setting the desired fields-of view (FOVs) of instrument detectors. The BRDF measurements for three types of diffuse samples using two different scatterometer measurement equations are compared and consistent results are obtained. The clocking effect of BRDF measured from those diffuse samples is also investigated, and the uncertainty budget of BRDF measurements for the large-area diffuse panel is discussed.

Conference Presentation

Citation Download Citation

Jinan Zeng, James J. Butler, and Xiaoxiong Xiong "Comparison of BRDF results from two different scatterometers for instrument validation in support of satellite instrumentation", Proc. SPIE 12232, Earth Observing Systems XXVII, 1223202 (30 September 2022); https://doi.org/10.1117/12.2636162

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