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《Journal of Basic Science and Engineering》 2012-04
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Resolution-assignable DEM Generalization Based on Rational-dilation Wavelet Transform

WANG Haijiang1,YANG Qinke2,WANG Chunmei1,GUO Weiling1 (1.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling 712100,China;2.College of Urban and Environmental Sciences,Northwest University,Xi'an 710069,China)  
A DEM generalization method to obtain lower-resolution DEM based on higher-resolution DEM was proposed by applying sampling theory and rational-dilation wavelet transform(RWT),as scale impact researches require the DEM dataset possessing continuously changeable resolutions and uniformly spatial location base.The relation between DEM resolution and sampling theory was analyzed and a new way to obtain resolution-assignable DEM by reducing the efficient max frequency in frequency-domain was presented.The freely and finely time-frequency decomposition via RWT was studied,and the energy-based threshold processing to the decomposed parts was proposed.A generalization method to generate resolution-assignable DEM was then obtained.The assigned resolution's validity,the spatial location consistency and the generalized effectiveness were proved,and the generalized result's advantage over the interpolated DEM from topographic map and the DEM from conventional methods were analyzed,via experiments.The result shows the method's effectiveness.
【Fund】: 国家自然科学基金资助项目(40971173)
【CateGory Index】: P217
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