TIN can joint discrete points in a certain manner, and generate optional triangle cover whole region even each other underlay.Establish discrete points of compartment spatial relation actually.

• 不规则三角网是按一定的规则将离散点连接成覆盖整个区域且互不重叠、结构最佳的三角形，实际上是建立离散点之间的空间关系。