Research on the Key Issues of CAD and GDB Conversion
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.
NETL
NSTL
万方数据
