文中叙述了三棱柱体的单元表达式和边界条件的处理：手法。
The finite element representation of triangular prism and the treatment of boundary conditions ave described.
提出一种基于多层dem与似三棱柱体元(QTPV)的混合三维数据模型。
A hybrid 3d spatial data model based on multi-DEMs and quasi tri-prism volume (QTPV) is proposed.
提出了三棱柱的体元构造，详细设计了点、三角形、侧面和三棱柱体的数据结构，建立了一定的拓扑关系。
Also this article puts forward the data structure of point, triangle, side face and tri-prism and builds some topology.
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