摘要
针对由Delaunay三角网所构建的TIN-DEM中地形特征线被压盖的现象,该文摒弃以往先提取地形特征线再约束构建Delaunay三角网的做法,通过分析地形特征线信息在TIN-DEM双向缓冲面上的体现,探究了地形特征线信息与滚动球路径之间的关系,提出采用双向滚动球网络结构信息替代地形特征线结构信息的做法,直接借助滚动球沿TIN-DEM正反面滚动过程中的滚动路径,对Delaunay三角网进行局部改进。实验结果表明:该算法可有效将压盖的地形特征线信息表现在Delaunay三角网中,提高了TIN-DEM的地形特征信息表达程度。
Aiming at the phenomenon of topographic feature lines being blanked in TIN-DEM constructed by Delaunay triangulation network,the paper gave up the method that the Delaunay triangular network was constructed by extracting terrain feature lines and then constraining them in the past,by analyzing the representation of terrain feature line information on the TIN-DEM bidirectional buffer surface,the relationship between terrain feature line information and rolling ball path was explored,and the method of replacing terrain feature line structure information with bidirectional rolling ball network structure information was proposed,the Delaunay triangulation net was improved by using the rolling path of the rolling ball along the front and back of TIN-DEM. Experimental results showed that this algorithm could effectively represent the terrain feature line information of the gland in the Delaunay triangulation network and improved the expression of the terrain feature information of TIN-DEM.
作者
李改肖
张志衡
董箭
LI Gaixiao;ZHANG Zhiheng;DONG Jian(Department of Hydrography and Cartography,Dalian Naval Academy,Dalian,Liaoning 116018,China;Troops 91776,Beijing 100036,China)
出处
《测绘科学》
CSCD
北大核心
2020年第4期156-160,共5页
Science of Surveying and Mapping
基金
国家自然科学基金项目(41601498)。
