Two kinds of main data structures of the DTM are briefly introduced in the paper, which are irregular net of triangulation (TIN) and regular rectangular grid (grid).
文中简要介绍了DTM的两种主要的数据结构：不规则三角网(TIN)和规则矩形格网(GRID)。
In the adjustment program of triangulation net by directional condition observation, to apply the formulas of polar coordinate condition is a new way.
本文介绍了三角网按方向条件观测平差的电算程序中，应用极坐标条件式的新方法。
Abstract: Establishing DTM, triangulation net is made of some rules, but some mistakes can take place in the part of the net.
文摘：建立数字地模时，三角网是按一定规则组成的，但局部仍会出现错误。
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