Abstract:

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.

Key words: distributed, e-map, map service, map database, map symbol database