Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (5): 861-872.DOI: 10.3969/j.issn.1004-1524.2021.05.12

• Environmental Science • Previous Articles     Next Articles

Application research of GF-1/WFV data in estimation of maize leaf area index

ZHANG Yuxun1,2(), WANG Lei1,2,*(), QU Xiangning1,2, CAO Yuan1,2, WU Mengyao1,2, YU Ruixin1,2, SUN Yuan3   

  1. 1. Breeding Base for State Key Laboratory of Land Degradation and Ecosystem Restoration in Northwest China, Ningxia University, Yinchuan 750021, China
    2. Key Laboratory for Restoration and Reconstruction of Degenerated Ecosystem in Northwest China under Ministry of Education, Ningxia University, Yinchuan 750021, China
    3. Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2020-09-25 Online:2021-05-25 Published:2021-05-25
  • Contact: WANG Lei

Abstract:

The leaf area index (LAI), which plays a key role in response of the structural parameters of vegetation canopy, is closely related to the physiological process of the canopy. It is also one of the important parameters in the field of vegetation remote sensing. In the typical maize distribution area in Nong’an County of Changchun, combined with the measured data, the leaf area index and canopy spectrum were simultaneously observed on the ground. With the help of the normalized vegetation index (NDVI), ratio vegetation index (RVI), atmospheric regulation vegetation index (ARVI), soil adjustment vegetation index (SAVI), modified soil adjustment vegetation index (MSAVI).The ground measured spectrum data and GF-1/WFV spectrum data in estimating maize canopy leaf area index were compared and analyzed. After that, the optimal model was screened by parameters, such as coefficient of determination (R2), root-mean-square error (RMSE), relative error (RE) and residual prediction deviation (RPD). The results showed that the correlation between the different vegetation indexes and LAI of the ground-measured spectral data was higher than that of the GF-1/WFV spaceborne spectral data. In the comparison of the correlation between the different vegetation indexes and LAI, it was found that MSAVI had the highest correlation with LAI among the vegetation indexes of the ground spectrum and the satellite spectrum structure. In the estimation model based on ground spectral data and satellite spectral data, the function types corresponding to the highest R 2 between MSAVI and LAI were different. For the measured spectrum, R 2 was corresponded to the exponential function model, and for the satellite spectrum, it was corresponded to the quadratic function model.

Key words: GF-1, vegetation index, maize, leaf area index, estimation model

CLC Number: