Estimating canopy leaf area index in the late stages of wheat growth using continuous wavelet transform

Yan Huang; Qingjiu Tian; Lei Wang; Jun Geng; Chunguang Lyu

doi:10.1117/1.JRS.8.083517

17 November 2014 Estimating canopy leaf area index in the late stages of wheat growth using continuous wavelet transform

Yan Huang, Qingjiu Tian, Lei Wang, Jun Geng, Chunguang Lyu

Author Affiliations +

Journal of Applied Remote Sensing, Vol. 8, Issue 1, 083517 (November 2014). https://doi.org/10.1117/1.JRS.8.083517

Abstract

The existing hyperspectral vegetation indices used for estimating the canopy leaf area index (LAI) of winter wheat (Triticum aestivum L.) performed well, but the use of such indices at late growth stages can lead to inaccurate results. To improve the performance of LAI models for wheat in late growth stages, the continuous wavelet transform (CWT) method was applied in this study and used to decompose the canopy reflectance and its first derivative into wavelet coefficients. The correlation scalograms of wavelet coefficients and the LAI were then constructed and used to extract the top 1% correlated region as the wavelet feature. The canopy LAI estimation model for late growth wheat was established at last and compared with models based on 12 different types of hyperspectral vegetation indices. The results showed that, compared with the estimation models using the hyperspectral vegetation indices (for which the R² values were all less than 0.15 and the root-mean-square errors (RMSEs) were greater than 1), the CWT-based canopy LAI estimation model for late growth wheat had obvious improvements in accuracy (maximum R² of 0.53 and minimum of RMSE of 0.78). Hence, this new method shows promise for use in agricultural and ecological applications.

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Yan Huang, Qingjiu Tian, Lei Wang, Jun Geng, and Chunguang Lyu "Estimating canopy leaf area index in the late stages of wheat growth using continuous wavelet transform," Journal of Applied Remote Sensing 8(1), 083517 (17 November 2014). https://doi.org/10.1117/1.JRS.8.083517

Published: 17 November 2014

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