面向中比例尺公共地图基础数据库缩编方法研究

Research on the Generalization Method of Medium Scale Public Map Basic Database

面向1∶250 000中比例尺公共地图基础数据库和政务用图需求,在构建缩编规则库的基础上,通过定义不同地物要素的缩编与转换规则,经过选取、概括和移位处理后,探索利用1∶50 000基础地图数据库跨比例尺级别进行自动缩编和数据更新的技术流程与方法,实现了大比例尺地图缩编更新获取中比例尺地图的目标。研究结果表明,利用基于规则库的缩编与更新方法,将1∶50 000基础地图数据缩编更新为1∶250 000基础地图数据,其成果精度可靠,完全可以满足中比例尺公共基础数据库快速更新的要求。

This paper is aimed at the basic database of 1∶250000 medium scale public maps and the requirements of government maps.On the basis of building the generalization rule base,through defining the generalization and conversion rules of different surface feature elements,after selection,generalization and displacement,this paper explores the technical processes and methods of automatic generalization and data update across scale levels using 1∶50000 basic map database,The goal of obtaining medium and small scale maps by generalization and updating medium scale maps is realized.The research results show that the generalization and updating method based on rule base is used to generalize and update from 1∶50000 basic map data to 1∶250000 basic map data.The accuracy of the results is reliable,which can fully meet the requirements of rapid updating of medium scale public basic database.