专题地图地理底图数据库的建立与管理

Creating and Managing of the BAse-map Database in the Thematic Mapping

本地理底图数据库系统是一个小型的数据库系统,它具备了地图数据库的基本功能,适应同一底图服务多种专题图编制的要求,提供多种检索途径;运用大量的位操作,使得数据库结构具有动态性、灵活性。将频繁交换的数据纳入内存,加快了系统运进速度;通过多边形组织,可自行建立专题要素与底图要素的图形关系,建立区域间层次关系,减小数据采集工作量。

Base-map database system is a small one which possesses some basic functoins ofcartographic database. In order to meet reguirements of selecting bade-map produced by rari-ous of the themalic mapping,it supplies a serious of selection ways. By using a large numberof bit-operations,the database strucure is active and flexible. The data which freguenly ex-change are stored in the main memory,so that the database can run guickly. The system isable to organize polygons and hierarchical relations between regions automaticaly,reducingworks in daba capture.