Journal
ENVIRONMENTAL MONITORING AND ASSESSMENT
Volume 188, Issue 2, Pages -Publisher
SPRINGER
DOI: 10.1007/s10661-016-5107-8
Keywords
Hyperspectral; Coal mining; Wavelets; Correlation analysis; Partial least squares regression; Soil organic matter
Categories
Funding
- National Administration of Surveying, Mapping, and Geo-information of China [201412016]
- Jiangsu Science and Technology Supporting Plan of China [BE2012637]
- Fundamental Research Funds for the Central Universities [KYLX_1395]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Hyperspectral estimation of soil organic matter (SOM) in coal mining regions is an important tool for enhancing fertilization in soil restoration programs. The correlation-partial least squares regression (PLSR) method effectively solves the information loss problem of correlation-multiple linear stepwise regression, but results of the correlation analysis must be optimized to improve precision. This study considers the relationship between spectral reflectance and SOMbased on spectral reflectance curves of soil samples collected from coal mining regions. Based on the major absorption troughs in the 400-1006 nm spectral range, PLSR analysis was performed using 289 independent bands of the second derivative (SDR) with three levels and measured SOM values. A wavelet-correlation-PLSR (W-C-PLSR) model was then constructed. By amplifying useful information that was previously obscured by noise, the W-C-PLSR model was optimal for estimating SOM content, with smaller prediction errors in both calibration (R-2=0.970, root mean square error (RMSEC)=3.10, and mean relative error (MREC) = 8.75) and validation (RMSEV = 5.85 and MREV = 14.32) analyses, as compared with other models. Results indicate that W-C-PLSR has great potential to estimate SOM in coal mining regions.
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