Compact Polarimetric Response of Rape (Brassica napus L.) at C-Band: Analysis and Growth Parameters Inversion
文献类型： 外文期刊
作者： Zhang, Wangfei 1 ; Li, Zengyuan 1 ; Chen, Erxue 1 ; Zhang, Yahong 2 ; Yang, Hao 3 ; Zhao, Lei 1 ; Ji, Yongjie 2 ;
作者机构： 1.Chinese Acad Forestry, Inst Forest Resource Informat Tech, Beijing 100091, Peoples R China
2.Southwest Forestry Univ, Coll Forestry, Kunming 650224, Peoples R China
3.Beijing Acad Agr & Forestry Sci, Beijing Res Ctr Informat Technol Agr, Beijing 100097, Peoples R China
关键词： compact polarimetric (CP) SAR;rape;Radarsat-2;day after sowing (DAS);random forest;Stokes parameters;polarimetric decomposition;backscatter coefficients
期刊名称：REMOTE SENSING （ 影响因子：4.848； 五年影响因子：5.353 ）
ISSN： 2072-4292
年卷期： 2017 年 9 卷 6 期
页码：
收录情况： SCI
摘要： Growth parameters like biomass, leaf area index ( LAI) and stem height play an import role for crop monitoring and yield prediction. Compact polarimetric (CP) SAR has shown great potential and similar performance to fully-polarimetric (FP) SAR in crop mapping and phenology retrieval, but its potential in growth parameters inversion has not been fully explored. In this paper, a time series of images of CP SAR was simulated from five FP SAR data gathered during the entire growth season of rape. CP response of 27 parameters, relying on Stokes parameters and their child parameters, decomposition parameters and backscattering coefficients, were extracted and investigated as a function of days after sowing (DAS) during the whole rape growth cycle to interpret their sensitivity to each growth parameter. Then, random forest (RF) was chosen as an automatic approach for the growth parameters inversion method, and its results were compared with traditional single-parameter regression models. Most of the CP parameters showed high sensitivity with growth parameters and great potential for growth parameters inversion. Among all of the regression models, the quadratic regression model showed the best performance for all of the growth parameters inversion, the best result for biomass inversion was the third component of the Stokes parameters (g3) with R-2 of 0.765 and RMSE of 73.20 g/m(2). For LAI and stem height was one of the Stokes child parameters, the circular polarization ratio (U-c), with R-2 of 0.857 and 0.923 and RMSE of 0.66 and 18.71 cm, respectively. RF showed the highest accuracy and smallest RMSE for all of three growth parameters inversion; R-2 for biomass, LAI and stem height were 0.93, 0.96 and 0.95, respectively; RMSE were 46.24 g/m(2), 0.25 and 13.5 cm, respectively. However, there are also some CP parameters, which showed low sensitivity to growth parameters, that had high importance for RF inversion. The results confirmed the potential of CP data and the RF method in growth parameters inversion, but they also confirmed that it was difficult to give a physical interpretation for the RF inversion model.
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