Dr. Jianjun Shi Profile

Dr. Jianjun Shi

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Proceedings Article | 15 November 2022 Paper

Constructing the application model of bidirectional reflection on the surface based on MODIS data

Lu Han, Yi Cai, Qinshan Xu, Chidong Xu, Wenqiang Lu, Jianjun Shi

Proceedings Volume 12448, 1244806 (2022) https://doi.org/10.1117/12.2627425

KEYWORDS: Vegetation, Bidirectional reflectance transmission function, Data modeling, Reflectivity, Reflection, MODIS

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Based on the MODIS surface reflectance data, the surface reflectance feature database of different surface types in Hefei and Shenyang was constructed in different seasons. First, the normalized difference vegetation index (NDVI) and blue/red light band reflectivity are used to classify the land surface into three categories: vegetation, bare soil, and ice/snow. Feature parameter fitting is performed on different surfaces, and the bidirectional reflectance distribution function (BRDF) feature parameter database is constructed. According to the definition of black sky/white sky albedo, the corresponding band albedo is calculated, and the narrow band and wide band albedo parameter database is also constructed. Analysing the distribution characteristics of BRDF and the change in black-sky/white-sky albedo (BSA/WSA), the results show that the BRDF on the vegetation surface has an obvious hot spot effect. The BSA/WSA of the vegetation is higher than that of the visible band in the near-infrared band, and bare soil, except Hefei in summer, has the same trends. The albedo of the ice and snow surface is significantly higher than that of the other two types of surfaces.

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