数字农科院2.0

Retrieval Of Winter Wheat Leaf A.rea Index From Chinese G f-1 Satellite Data Using The Prosail Model

文献类型： 外文期刊

作者： Li, H; Liu, GH; Liu, QS; Chen, ZX; Huang, C

作者机构：

关键词： leaf area index; PROSAIL; look-up table; GF-1; winter wheat

期刊名称： SENSORS

ISSN： 1424-8220

年卷期： 2018 年 18 卷 4 期

页码：

收录情况： JCR（2021版） ; EI（2021版）

摘要： Leaf area index (LAI) is one of the key biophysical parameters in crop structure. The accurate quantitative estimation of crop LAI is essential to verify crop growth and health. The PROSAIL radiative transfer model (RTM) is one of the most established methods for estimating crop LAI. In this study, a look-up table (LUT) based on the PROSAIL RTM was first used to estimate winter wheat LAI from GF-1 data, which accounted for some available prior knowledge relating to the distribution of winter wheat characteristics. Next, the effects of 15 LAI-LUT strategies with reflectance bands and 10 LAI-LUT strategies with vegetation indexes on the accuracy of the winter wheat LAI retrieval with different phenological stages were evaluated against in situ LAI measurements. The results showed that the LUT strategies of LAI-GNDVI were optimal and had the highest accuracy with a root mean squared error (RMSE) value of 0.34, and a coefficient of determination (R-2) of 0.61 during the elongation stages, and the LUT strategies of LAI-Green were optimal with a RMSE of 0.74, and R-2 of 0.20 during the grain-filling stages. The results demonstrated that the PROSAIL RTM had great potential in winter wheat LAI inversion with GF-1 satellite data and the performance could be improved by selecting the appropriate LUT inversion strategies in different growth periods.

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