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27 October 2015 Modeling the adjacency effects in Earth observation data with different viewing geometry over mountainous area
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Abstract
For an earth observation system, an increase in the off-nadir viewing angle leads to an increase in line of sight scattered radiance. Meanwhile, steep terrain over mountainous area induces changes in irradiance at ground level and then affects the top of atmosphere (TOA) signal. In this paper, a methodology is presented to simulate and analyze the adjacency effects. In the second section of the paper, the radiative transfer equations are built separately for the nadir viewing geometry and the off-nadir viewing geometry over mountainous area. In order to model the adjacency effects, the radiance items related to the adjacency effects are estimated. During the procedure, the molecular/aerosol scattering phase functions, different viewing geometry, ground heterogeneity and topography are taken into account. The performance of this methodology is validated through simulating a set of space-borne data over mountainous areas for nadir viewing angles and off-nadir viewing angles. The results indicate that the contributions of adjacency effect at TOA are significantly different for the varying viewing geometry conditions. The proposed method proved to be useful in understanding the mechanisms of adjacency effects and it will be applied to atmospheric correction of remotely sensed data.
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Cheng Jiang, Hongyan He, and Yunfei Bao "Modeling the adjacency effects in Earth observation data with different viewing geometry over mountainous area", Proc. SPIE 9640, Remote Sensing of Clouds and the Atmosphere XX, 96400N (27 October 2015); https://doi.org/10.1117/12.2194424
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