CAD与GDB转换的关键问题研究

Research on the Key Issues of CAD and GDB Conversion

目前土地利用现状普查及确权项目中,已有的CAD数据样式丰富、内容表达多样,而成果要求CAD图形与GDB数据库从图面表达到属性内容均一致。分析CAD图形与GDB数据库在数据结构、表达形式、拓扑关系等方面的特点,建立了点、线、面等预处理数据的入库技术流程,重点描述了CAD与GDB转换过程中特殊符号图库一致、特殊地块属性赋值方法、表格行列转置及岛洞面域入库等几个关键问题。实现了图形与数据库的表达一致以及属性信息的准确挂接等,提高了数据转换的质量和效率,具有较高的参考价值。

In the current land use status survey and legal confirmation of land rights project,the CAD data obtained are rich in style,diverse in content and form of expression,and the GDB results require graphics and database expression to be consistent.This paper analyzes the characteristics of CAD graphic data and GDB database in terms of data structure,expression form and topological relationship,establishes the technical process of data entry of points,lines and surfaces,and describes several key issues such as the consistency of special symbols database and the assignment method of plot attributes,the transposition of table rows and columns and the entry of island hole surface domain in the conversion process of CAD and GDB.It achieves the consistency of geometric space expression before and after conversion and the accurate linkage of map attribute information,which improves the efficiency and quality of data conversion and is of high reference value.