title: Hyperspectral analysis of soil organic matter in coal mining regions using wavelets, correlations, and partial least squares regression.
abstract: 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 SOM based 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.
authors.affiliation: School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, 221116, China.|Key Laboratory of Land Environment and Disaster Monitoring, National Administration of Surveying, Mapping and Geo-information (NASG), Xuzhou, 221116, China.|Jiangsu Provincial Key Lab of Resources and Environment Information Engineering, Xuzhou, 221116, China.
authors.forename: Lixin
authors.initials: L
authors.lastname: Lin
authors.affiliation: School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, 221116, China. wycgcumt@163.com.|Key Laboratory of Land Environment and Disaster Monitoring, National Administration of Surveying, Mapping and Geo-information (NASG), Xuzhou, 221116, China. wycgcumt@163.com.|Jiangsu Provincial Key Lab of Resources and Environment Information Engineering, Xuzhou, 221116, China. wycgcumt@163.com.
authors.forename: Yunjia
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, 221116, China.|Key Laboratory of Land Environment and Disaster Monitoring, National Administration of Surveying, Mapping and Geo-information (NASG), Xuzhou, 221116, China.|Jiangsu Provincial Key Lab of Resources and Environment Information Engineering, Xuzhou, 221116, China.
authors.forename: Jiyao
authors.initials: J
authors.lastname: Teng
authors.affiliation: College of Automation, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China.
authors.forename: Xuchen
authors.initials: X
authors.lastname: Wang
mesh_terms: D002138:Calibration; D003032:Coal Mining; D004784:Environmental Monitoring / Q000379:methods*; D016018:Least-Squares Analysis; D016014:Linear Models; D008962:Models, Theoretical; D012987:Soil / Q000737:chemistry*
chemical_list: D012987:Soil
keywords: Coal mining; Correlation analysis; Hyperspectral; Partial least squares regression; Soil organic matter; Wavelets