红外与毫米波学报2011，Vol.30Issue(4)：316-321,6.
不同尺度的微分窗口下土壤有机质的一阶导数光谱响应特征分析
Analysis on derivative spectrum feature for SOM under different scales of differential window
摘要
Abstract
The hyper-spectral reflectance of soil was measured by a ASD FieldSpec within 400 ~ 1000 nm,then treated with logarithmic transformation. First derivative of soil spectra with different scales of differential window were acquired and de-noised by the threshold denoising method based on wavelet transform. From the first derivative of soil spectra, feature parameters used as indicators for soil organic matter content were extracted. Results show that:(1) When the number of the scale of differential window was set as W=1~ 5, it is difficult to identify the spectrum contour and response feature in first derivative of soil spectra because of much noise. (2) When W = 6 ~ 15, noise in first derivative of soil spectra is partly removed, and spectrum contour is identified roughly. However spectral response feature resulted from different organic content levels can not be identified clearly. ( 3 ) When W = 16 ~ 30, noise in first derivative of soil spectrua is removed effectively. The coefficient of correlation between organic matter content and feature parameter MDs19 is 0. 803. MDs19 can be used as one of the best indicators for soil organic matter content.关键词
可见/近红外光谱/土壤有机质/一阶导数光谱/小波去噪/特征增强/特征提取Key words
VIS/NIR spectrum/ soil organic matter (SOM)/ first derivative of spectrum/ wavelet denoising/ feature enhancement/ feature extraction分类
农业科技引用本文复制引用
刘炜,常庆瑞,郭曼,邢东兴,员永生..不同尺度的微分窗口下土壤有机质的一阶导数光谱响应特征分析[J].红外与毫米波学报,2011,30(4):316-321,6.基金项目
国家“973”计划项目(2007CB407203) （2007CB407203）
国家自然科学基金项目(30872073) （30872073）
“十一五”国家科技支撑计划重大项目(2006BAD09B0603) （2006BAD09B0603）
