Fast and Accurate Simulation of Canopy Reflectance under Wavelength-Dependent Optical Properties Using a Semi-Empirical 3D Radiative Transfer Model  

作　　者：Jianbo Qi Jingyi Jiang Kun Zhou Donghui Xie Huaguo Huang 

机构地区：[1]State Forestry and Grassland Administration Key Laboratory of Forest Resources and Environmental Management,Beijing Forestry University,Beijing 100083,China [2]The Key Laboratory for Silviculture and Conservation of Ministry of Education,Beijing Forestry University,Beijing 100083,China [3]Ecological Observation and Research Station of Heilongjiang Sanjiang Plain Wetlands,National Forestry and Grassland Administration,Beijing Forestry University,Beijing 100083,China [4]The State Key Laboratory of Remote Sensing Science,Institute of Remote Sensing Science and Engineering,Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China

出　　处：《Journal of Remote Sensing》2023年第1期48-59,共12页国际遥感学报（英文）

基　　金：supported by the National Natural Science Foundation of China programs(Grant No.42001279 and Grant No.42101329);Open Fund of State Key Laboratory of Remote Sensing Science(Grant No.OFSLRSS202014 and Grant No.OFSLRSS202115).

摘　　要：Generating canopy-reflectance datasets using radiative transfer models under various leaf and optical property combinations is important for remote sensing retrieval of vegetation parameters.Onedimensional radiative transfer models have been frequently used.However,three-dimensional(3D)models usually require detailed 3D information that is difficult to obtain and long model execution time,limiting their use in remote sensing applications.This study aims to address these limitations for practical use of 3D models,proposing a semi-empirical speed-up method for canopy-reflectance simulation based on a LargE-Scale remote sensing data and image Simulation model(LESS),called Semi-LESS.The speed-up method is coupled with 3D LESS to describe the dependency of canopy reflectance on the wavelength,leaf,soil,and branch optical properties for a scene with fixed 3D structures and observation/illumination configurations,allowing fast generating accurate reflectance images under various wavelength-dependent optical parameters.The precomputed dataset stores simulated multispectral coefficient images under few predefined soil,branch,and leaf optical properties for each RAdiation transfer Model Intercomparison-V scene,which can then be used alone to compute reflectance images on the fly without the participation of LESS.Semi-LESS has been validated with full 3D radiative-transfer-simulated images,showing very high accuracy(root mean square error<0.0003).The generation of images using Semi-LESS is much more efficient than full LESS simulations with an acceleration of more than 320 times.This study is a step further to promote 3D radiative transfer models in practical remote sensing applications such as vegetation parameter inversions.

关 键 词：reflectance SIMULATION branch 

分 类 号：O43[机械工程—光学工程]