大比例尺地形图数据库地物变化研究

Feature changes in database of relief map on a large scale.

为实现城市大比例尺地形图数据库的持续更新,在大比例尺地形图图式及地形图要素几何特征和属性项多寡的基础上,采用中华人民共和国国家标准《GB/T7929--1995,1∶500,1∶1 000,1∶2 000地形图图式》的地物要素分类方法,将大比例尺地形图数据的变化分类为图元对象或地理对象的变化、图层(或专题)的变化以及数据集的变化.对图元对象或地理对象的变化的内容进行了具体描述,包括产生、消失或版本变化,将这种描述记录在地形图数据库编辑软件的日志表中可以实现地形图的增量更新.

In order to update the relief map database continuously,based on the relief map specification on a large scale,the geometric features and the number of attribute items,according to Specification for Cartographic Symbols 1∶500,1∶1 000 and 1∶2 000(China's national standard),this paper classifies the changes of relief map data on a large scale: changes of graphic or geographic objects,and changes of layers or themes,and changes of datasets.The paper describes the variety contents of graphic or geographic objects: formation,disappearance and version changes.Increment updating of relief map database can be realized by recording the description to log table of editing software of relief map database.