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《Science of Surveying and Mapping》 2013-03
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Establishment and update of fine DEM for strip mine

SUI Xin ①②③,XU Ai-gong ②,SONG Wei-dong ②(①Research Center of GNSS,Wuhan University,Wuhan 430079,China;②School of Geomatics,Liaoning Technical University,Liaoning Fuxin 123000,China;③Key Laboratory for Urban Geomatics of National Administration of Surveying,Mapping and Geoinformation,Beijing 100044,China)  
Because of the complicated terrain feature of strip mine,corresponding constraint condition should be considered in the process of modeling;otherwise the flight of steps will be cut.According to the actual situation of mining area,an algorithm for constrained Delaunay triangulation establishment within one step was proposed in the paper.In this algorithm,constrained Delaunay triangulation was finally generated within boundary,through spatial data extraction,topological relations generation and spatial indexing generation.Since the amount of DEM data of the whole mining area is huge,fast updating of DEM should be considered and the concept of extended boundary was proposed.Using the extended boundary and the construction algorithm of TIN,part model generation and seamless splicing between part model and whole model could be achieved for the whole model update of DEM at last.
【Fund】: 现代城市测绘国家测绘地理信息局重点实验室开放课题资助项目(20111203W);; 辽宁省高等学校重点实验室项目(2009S049);; 辽宁省高等学校优秀人才支持计划资助(LR201018);; 国家测绘局测绘基础研究基金资助项目(10-01-03)
【CateGory Index】: P208;TD17
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