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《Acta Geodaetica Et Cartographic Sinica》 2003-02
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A Study of Distributed GIS Based on J2EE

CHEN Nengcheng,GONG Jianya,ZHU Xinyan,LIU Lin(National Laboratory for Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China)  
With the increasing maturity of distributed object technology,CORBA,.NET and EJB are universally used in IT field. However, theory and practice of distributed GIS needs further improvement in virtue of contradictions between large scale vector data and limited network bandwidth or between transitory session and long transaction processing. Differences and trends among CORBA,.NET and EJB are discussed in details, the concept, architecture and characteristic of distributed GIS based on J2EE is provided afterwards, which contains GIS client application, Web server, GIS application server and spatial data server. Moreover the design and implementation of components of client application based on JavaBeans, the GIS engine based on Servlet, the GIS Application server based on GIS enterprise JavaBeans(contains session bean and entity bean) are explained. Lastly, the experiments of relation of vector data and response time under different conditions are conducted, which proves that distributed GIS based on J2EE can be used to manage, distribute and share large scale vector data.
【CateGory Index】: P208
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