以数据库为依托，借助地理数据引擎，探讨并设计了对多源数据在数字地图出版系统中组织及管理；
Relying on database and geographic data engine discusses and designs the organization and management of multi-source data in digital map publishing system.
作者通过变焦数据模型原理，探讨如何建立多层存贮结构，将数字地图中的大比例尺地图数据库自动导出小比例尺图形。
This paper discusses how to establish multilayer storage structure and automatically reduce small scale graph from large scale mapping database by theory of changed-focuses Datum Model.
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