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《Forest Engineering》 2012-05
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ICESAT-GLAS data processing based on wavelet transform

Qiu Sai,Xing Yanqiu*,Li Licun,Wang Meng(Forest Operations and Environment Research Center,Northeast Forestry University,Harbin 150040)  
The advantage of wavelet transform on signal processing is increasingly obvious.Since the wavelet basis isn't unique,the results derived from the same data by different wavelet basis may be various.In order to know which wavelet basis is appropriate for ICESAT-GlAS data,this paper chooses Daubechies wavelet basis and Symlets wavelet basis according to the comparison and analysis on the characteristics of eight common wavelet basis parameters in MATLAB,and achieves the denoised wave by the decomposition,setting threshold function,and re-constructing to the data about the shape of echo wave from ICESAT-Glas.The conclusions are the SNR of the data processing using Sym7 of Symlets wavelet basis is higher than that using db1 of Daubechies wavelet basis,while the RMS error is lower than that using db1.Thus,Sym7 wavelet is the right one to process the data of ICESAT-GlAS.
【Fund】: 国家自然科学基金资助项目(4087119);; 中国科学院数字地球重点实验室开放基金课题(2011LDE012);; 东北林业大学工程技术学院大学生创新项目资助项目
【CateGory Index】: TN911.7
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