digital line graphs meaning in English

数字线划图

This paper uses digital line graphs for original data . after author bases on large - scale relief map " feature and analyses the feature , data structure and creation algorithms of two main representation shape ? triangulated irregular network and regular grid , author provides a kind of method that large - scale dem is created from tin which is created from large - scale dlg
本文以数字线化图为原始数据，针对大比例地形图的特点，在分析了数字高程模型的两种主要表现形式? ?不规则三角网tin和规则格网grid的特点、数据结构、生成算法的基础上，考虑到大比例尺数字高程模型能最大限度符合实际地形特点，提出了一种从大比例尺数字线化图dlg生成不规则三角网tin ，再由不规则三角网内插生成大比例尺数字高程模型grid的方法。