| 1. | At first synthesized professional branch and graphical symbols of coal mine geology and survey , mainly including point , line , region and so on , and then classified and coded the geology and survey information entity by different professional layers and formed a classification and code system based on gis
摘要综合煤矿地质测量信息的专业特性及信息表示的几何特征（主要包括点、线、面等） ，按专题图层对煤矿地质测量的实体对象进行分类与编码，形成了一套基于gis的煤矿地质测量信息分类编码体系。 |
