Xi-jun WU, Jie ZHANG, Chun-yan XIAO, Xue-liang ZHAO, Kang LI, Li-li PANG, Yan-xin SHI, Shao-hua LI. Study on Inversion Model of Soil Heavy Metal Content Based on NMF-PLS Water Content[J]. Spectroscopy and Spectral Analysis, 2021, 41(1): 271
- Spectroscopy and Spectral Analysis
- Vol. 41, Issue 1, 271 (2021)
Fig. 1. NJW cluster analysis result
(a): Original sample point;(b): Sample point after clustering
(a): Original sample point;(b): Sample point after clustering
Fig. 2. Spectral determination spectra of 800 mg·kg-1 heavy metal Pb under different water contents
Fig. 3. Spectral preprocessing result
(a): S-G smooth denoising;(b): Linear background minus background
(a): S-G smooth denoising;(b): Linear background minus background
Fig. 4. Effect of r on peak signal to noise ratio
Fig. 5. Spectrum before and after NMF algorithm processing
(a): Spectrum before NMF processing; (b): The spectrum of NMF processed by the number of end elementsr =5; (c): The spectrum of NMF after the number of end elements r =10
(a): Spectrum before NMF processing; (b): The spectrum of NMF processed by the number of end elements
Fig. 6. Comparison of measured and predicted values of PLSR model, EPO-PLSR model and NMF-PLSR model
(a): PLSR model; (b): EPO-PLSR model;(c): NMF-PLSR model
(a): PLSR model; (b): EPO-PLSR model;(c): NMF-PLSR model
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