Validation of LAI retrieval results of winter wheat in Yancheng, Luohe area of Henan Province

doi:10.6046/gtzyyg.2020.01.22

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Abstract

In order to compare the validation performances of different validation methods on the GF-1/WFV winter wheat LAI retrieval results, the authors chose Yancheng, Luohe City of Henan Province as the study area. Three methods, i.e., single point ground measurement validation, multi-point upscaling validation, and high-resolution result validation, were tested to verify the performance of winter wheat LAI inversion based on GF-1/WFV image. The results show that the RMSE obtained by the above three verification methods are 0.57,0.80 and 0.46,respectively. The correlation coefficients are 0.885, 0.508 and 0.867,respectively. The multi-point upscaling method has higher requirements for the number of sampling points and the position of sampling points. Therefore, the accuracy is low and the effect is poor in the case of fewer sampling points in this study. The other two methods have relatively high precision and applicability, and the validation method with the introduction of high-resolution image achieves higher precision, and hence this method is more suitable for the validation of LAI inversion of GF-1/WFV images.

Keywords LAI GF-1/WFV winter wheat validation

TP79

Corresponding Authors: Qiming QIN E-mail: qmqinpku@163.com

Issue Date: 14 March 2020

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	Hui YUAN
	Qiming QIN
	Yuanheng SUN

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Hui YUAN,Qiming QIN,Yuanheng SUN. Validation of LAI retrieval results of winter wheat in Yancheng, Luohe area of Henan Province[J]. Remote Sensing for Land & Resources, 2020, 32(1): 162-168.

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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020.01.22 OR https://www.gtzyyg.com/EN/Y2020/V32/I1/162

Fig.1 Distribution of the study area and samples in Yancheng, Luohe City

Tab.1 Comparison of GF-1/WFV and WorldView-2 images information

Fig.2 GF-1/WFV spectral response function curve

Fig.3 LAI estimation results based on GF-1/WFV in study area

Fig.4 WorldView-2 LAI retrieval result before and after upscaling

Fig.5 Validation of LAI estimation results in study area

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