土石方计算中不规则三角网的生成及应用

不规则三角网(TIN)作为一种表现三维表面的离散数字形式在很多领域都有广泛的应用,最常见的如数字高程模型(DEM)。目前,对由大量离散点组成的地形表面构建TIN最为成熟的方法为基于狄洛尼原则的构网方法。但是该方法并不能很好地顾及"地形特征线"。而在实际应用中,设计地形(如交通工程中的设计道路、疏浚工程中的设计航道、吹填工程中的设计堤坝)正是由大量的地形特征线构成,所以该方法并不能解决这类地形的建模问题。在总结狄洛尼三角网构网方法的基础上,结合疏浚工程和吹填工程探讨了基于多边形剖分的设计地形建模方法并给出了应用实例。

Generation and Applications of Triangulated Irregular Network in Earthwork

Triangulated Irregular Network(TIN) as a discrete numeric form presenting 3D surface is widely applied in such project fields as DEM(Digital Elevation Model).At present,the most popular way to model terrain surface composed of a great many discrete points is the way based Delaunay principle.But,for the reason that this way does not consider terrain feature lines well,it can not be well applied to model such surfaces of design topography as design roads in Traffic Engineering,design channels in dredging project and design dykes in hydraulic fill project which is composed of many terrain feature lines.In this paper,except concluding Delaunay TIN,the way based on polygon decomposition which is used for designed terrain modeling is discussed combining with dredging project and hydraulic fill project.