分布式电子地图服务主要研究在分布式计算环境中向客户提供地图服务的方法。它是通过多个服务器协同、透明地向客户提供网络地图服务,地图服务主要包括地图信息查询、远程修改地图符号、远程地图编辑、地图投影变换、地图打印、地图专题图制作和地图空间分析等。实现分布式电子地图服务要通过分布式计算技术和地理信息系统技术的结合。分布式计算目前主要使用CORBA,DCOM或EJB等中间件技术实现。本文讨论使用CORBA技术在服务器端构造分布式异构地图数据库和地图符号库的方法和客户端电子地图服务的解决方案。

Distributed e-map service research mainly focuses on the method of providing map service to clients in distributed computing environment. Its principle is to provide map service by a few distributed servers cooperatively and transparently. Map service includes map information query, remote modifying map symbol, map edit, map projection transform, map printing, subject map and map spatial analysis and etc. Distributed e-map service is implemented by integration of distributed computing and geographic information system. Now the main distributed computing technology is the middleware technology such as CORBA, DCOM and EJB. This article will focus on how to design distributed heterogeneous map database and map symbol database on servers and how to provide map service on clients with CORBA.