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。
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。
Abstract: Establishing DTM, triangulation net is made of some rules, but some mistakes can take place in the part of the net.
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