Spectroscopy and Spectral Analysis, Volume. 42, Issue 4, 1144(2022)
Threshold Calibration of Key Parameters of Withered Grass Based on PROSAIL Model in Qinghai-Tibet Plateau
Figures & Tables(8)
Fig. 1. Measured withered grass spectrum (MW) on November 27, 2020 in Haibei
Fig. 2. The average spectrum for all samples on August 30 and December 30 respectively in Haibei
Fig. 3. The measured spectrum of withered grass from 400 to 1 300 nm after data preprocessing
Fig. 4. Maximum and minimum of simulated spectral serials of withered grass obtained by two-step identification
Fig. 5. Percentage area stacking of sensitivity index for 10 main characteristic parameters
Table 1. Initial value of PROSAIL model
View tableView in ArticleTable 1. Initial value of PROSAIL model
参数 描述 单位 初始值 参数运行范围 LAI 叶面积指数 cm2·cm-2 0.96 0.2~2.5 LAD 平均叶倾角 degree 45 0~90 Cab 叶绿素 μg·cm-2 1.63 0~35 Cbr 棕色素 μg·cm-2 1.53 0~2 Car 类胡萝卜素 μg·cm-2 22 0~30 Cant 花青素 μg·cm-2 2.03 0~15 N 叶片结构参数 - 1.12 0.7~2.0 Cw 等效水厚度 cm 0.000 7 0.000 1~0.005 0 Cm 干物质 g·cm-2 0.02 0.002~0.050 Hspot 热点参数 - 0.57 0.01~1.0 OZA 观测天顶角 degree 0 - SZA 太阳天顶角 degree 61 - RAA 相对方位角 degree 180 -
Table 2. Threshold and coupling relation index of withered grass characteristic parameters simulated optimized by sensitivity analysis
View tableView in ArticleTable 2. Threshold and coupling relation index of withered grass characteristic parameters simulated optimized by sensitivity analysis
参数 LAI LAD Cab Cbr Car Cant N Cw Cm Hspot 范围 0.2~1.5 11~90 0.03~25 1.3 22 2.03 1.12 0.000 1~0.005 0.002~0.05 0.57 耦合值 166.8 150.8 30.0 30.1 10.6 45.3 42.4 135.8 14.5 15.6
Table 3. Reference table for 10 main parameters threshed of withered grass
View tableView in ArticleTable 3. Reference table for 10 main parameters threshed of withered grass
参数 LAI LAD Cab Cbr Car Cant N Cw Cm Hspot 范围 0.2~0.89 11~90 0~1.29 1.3 22 2.03 1.12 0.000 1~0.005 0.008~0.05 0.57
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Hao LIANG, Wei-xin XU, Xu-hui DUAN, Juan ZHANG, Na DAI, Qiang-zhi XIAO, Qi-yu WANG. Threshold Calibration of Key Parameters of Withered Grass Based on PROSAIL Model in Qinghai-Tibet Plateau[J]. Spectroscopy and Spectral Analysis, 2022, 42(4): 1144
Paper Information
Category: Research Articles
Received: Apr. 27, 2021
Accepted: --
Published Online: Jul. 25, 2023
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