Spectral feature extraction and modeling of soil total nitrogen content based on NIR technology and wavelet packet analysis

Lihua Zheng; Minzan Li; Xiaofei An; Luan Pan; Hong Sun

doi:10.1117/12.866220

16 November 2010 Spectral feature extraction and modeling of soil total nitrogen content based on NIR technology and wavelet packet analysis

Lihua Zheng, Minzan Li, Xiaofei An, Luan Pan, Hong Sun

Author Affiliations +

Proceedings Volume 7857, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications III; 78571M (2010) https://doi.org/10.1117/12.866220
Event: SPIE Asia-Pacific Remote Sensing, 2010, Incheon, Korea, Republic of

Abstract

It is a non-destructive and real-time method to detect the soil nutrient content by using spectroscopy analysis technology. In order to isolate the effective spectral for TN content from the soil spectra effectively, the NIR model predicting TN was developed based on wavelet packet analysis. 100 soil samples were collected for calibration and validation from the field. First, using the high-precision NIR detecting instrument to scan the target and obtaining the continuous spectra of soil samples in the laboratory. Secondly, with three different orthogonal wavelets (bior4.4, db4, sym4) as the generating functions, the original signal of each soil sample was decomposed and reconstructed based on the respective wavelet packet. Then the multiple linear regression (MLR) models for TN were established based on each drawn characteristic spectrum. Finally, three models were compared and analyzed, and the model with the highest forecasting accuracy was obtained based on db4, which determined R² reached 0.904. The research concluded that wavelet packet analysis could eliminate or substantially reduce the factors outside the parameters to the spectrum directly or indirectly, and the obstacles in establishing linear models for soil parameters were removed. It is feasible and potential to the real-time prediction of TN content.

Citation Download Citation

Lihua Zheng, Minzan Li, Xiaofei An, Luan Pan, and Hong Sun "Spectral feature extraction and modeling of soil total nitrogen content based on NIR technology and wavelet packet analysis", Proc. SPIE 7857, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications III, 78571M (16 November 2010); https://doi.org/10.1117/12.866220

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