Articles | Volume 17, issue 7
https://doi.org/10.5194/amt-17-1965-2024
https://doi.org/10.5194/amt-17-1965-2024
Research article
 | 
08 Apr 2024
Research article |  | 08 Apr 2024

An improved BRDF hotspot model and its use in VLIDORT for studying the impact of atmospheric scattering on hotspot directional signatures in the atmosphere

Xiaozhen Xiong, Xu Liu, Robert Spurr, Ming Zhao, Qiguang Yang, Wan Wu, and Liqiao Lei

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Cited articles

Bacour, C. and Bréon, F.-M.: Variability of biome reflectance directional signatures as seen by POLDER, Remote Sens. Environ., 98, 80–95, https://doi.org/10.1016/j.rse.2005.06.008, 2005. 
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Bréon, F. M., Maignan, F., Leroy, M., and Grant, I.: Analysis of hotspot directional signatures measured from space, J. Geophys. Res., 107, 4282–4296, 2002. 
Chen, J. M. and Cihlar, J.: A hotspot function in a simple bidirectional reflectance model for satellite applications, J. Geophys. Res., 102, 25907–25913, 1997. 
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Short summary
The term “hotspot” refers to the sharp increase in reflectance occurring when incident (solar) and reflected (viewing) directions coincide in the backscatter direction. The accurate simulation of hotspot directional signatures is important for many remote sensing applications, but current models typically require large values of computations to represent the hotspot accurately. This paper provides a numerically improved hotspot BRDF model that converges much faster and is used in VLIDORT.
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