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《Science of Surveying and Mapping》 2005-01
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Application research of wavelet analysis in GIS

XIAO Zhi-gang~①,WANG Liang~②,TIAN Li-fang~①(①China University of Mining & Technology,Beijing,100083,China;②Chinese Academy of Surveying and Mapping,Beijing 100039,China)  
One problem in WebGIS is the process of mass data.If the problem of its transmission through Internet is solved,then cruise on large-scale vector-image overlay and large-scale terrain 3D view flying can be realized.During the simplification research of terrain,image and DEM data based on wavelet analysis,the method to select available wavelet transformation and the optimal wavelet according to application needs is put forward.First,classify the extensive terrain and images and do wavelet transform,then the visualization from them within eyeshot,at last simplify and mapping the terrain and images according to wavelet coefficients.During data processing,wavelet arithmetic is advanced.The experiment results proves that wavelet analysis method is very effective for terrain simplification algorithm.
【Fund】: 国家“十五”重大科技专项(2002BA105A-01)
【CateGory Index】: P208
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