| 基于等高线的约束CD-TIN的地形特征识别 |
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| 引用本文： | 胡瑞鹏,王刚.基于等高线的约束CD-TIN的地形特征识别[J].湖北大学学报(自然科学版),2013(2):247-251,257. |
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| 作者姓名： | 胡瑞鹏 王刚 |
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| 作者单位： | 武汉工业学院数学与计算机学院;武汉大学资源与环境科学学院;天津测绘研究院 |
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| 基金项目： | 数字城市地理空间框架建设项目(2010-KJA-13)资助 |
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| 摘 要： | 采用改进的凸包算法建立等高线离散数据点的无约束D-TIN，再运用基于影响域对角线交换的局部调整算法，将等高线作为特征约束嵌入到D-TIN中，建立以等高线为特征约束的CD-TIN，来处理无约束D-TIN后可能产生的跨越等高线的非法三角形．建立了支持空间数据挖掘的约束CD-TIN后，通过计算CD-TIN中D三角形的法向量和坡度值，将等高线地形图中的山地和平地区分开，并进一步识别出山地区域中的山峰信息．
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| 关 键 词： | 等高线 地形特征 D-TIN CD-TIN 凸包算法 识别 |
Recognition of the terrain features based on CD-TIN of contour lines |
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| HU Ruipeng,WANG Gang.Recognition of the terrain features based on CD-TIN of contour lines[J].Journal of Hubei University(Natural Science Edition),2013(2):247-251,257. |
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| Authors: | HU Ruipeng WANG Gang |
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| Institution: | 1.School of Mathematics & Computer Science,Wuhan Polytechnic University,Wuhan 430023,China; 2.School of Resource and Environmental Science,Wuhan University,Wuhan 430079,China; 3.Tianjin Institute of Surveying and Mapping,Tianjin 300381,China) |
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| Abstract: | Firstly using improved convex hull algorithm to construct non-constrained Delaunay Triangulation Irregular Net（D-TIN）, then using the local adjusting algorithm based on diagonals Changing of the impacted region to embed contour lines into D-TIN as constrained segments and ultimately construct constrained D-TIN（CD-TIN）. It was easy to compute normal vectors of Delaunay triangles in the CD-TIN, and then got their gradient values. By means of the relationship of gradient values and terrain features, flats and mountain regions could be distinguished from topographic map based on contour lines. Even the terrain features such as mountain peak could be also recognized in the recognized mountain regions primarily by Flat-Triangle whose three vertexes had the same digital elevation. |
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| Keywords: | contour lines terrain feature D-TIN CD-TIN convex hull algorithm recognition |
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