Research And Development Of Geographic Information Exchange And Share System

The 21st century is a highly informational era. In order to improve the informational level, a number of countries and districts are constructing "Digital City". In the process of constructing "Digital City", there are all kinds of different data resources and different data models which every department must be face with. Along with the slim possibility of cooperation, the phenomenon of "information isolated island" has been emerged. As the central part of "Digital City", Urban Geographic Information System (UGIS) confronts the difficulty of managing both different data resources and different data models. So the geographic information exchange and share in the constructing of Urban Geographic Information System is the focus of the current Geographic Information System application research area. Geographic information exchange and share are an important symbol of the modern information society, and will become an important research direction about GIS in 21st century.Based on a case study of "Jing'an Geographic Information Exchange and Share System", the paper is mainly on the comprehensive study of foundation of theory and technology, key techniques, function model, system construction and system development. Now the system has run in the Information Center of Jing'an district.The thesis totally is divided into seven chapters. Chapter 1 is "Introduction". It firstly introduces the challenge of Urban Geographic Information System, and then presents the significance of geographic information exchange and share. In the end of chapter, the author analyzes the application status of geographic information exchange and share with the perspective in nation and abroad. Chapter 2 is "the foundation of theory and technology in constructing geography information exchange and share system". In this chapter, the author expatiates the influence factors, standardization, technology support system and correlative policy in geographic information share. Chapter 3 is "key techniques of constructing geographic information exchange and share system". It mainly introduces the key techniques like Web GIS, Spatial Data Organization and Management, Web Service, Component and so on. Chapter 4 is "the design of geographic information exchange and share system". It firstly introduces goals and functions of the system, and then analyzes the structure of J2EE (Java 2 Platform Enterprise Edition) and the structure of .NET. In the end of this chapter, the author designs a frame of system based on J2EE. Chapter 5 is "the development of geographic information exchange and share system". It mainly introduces the development of function models, like the development of registering based ondatabase connection, the development of uploading based on JspSmartUpload, the development of spatial data storing into database, and the development of spatial data and metadata display and downloading based on Internet Map Service (IMS). Chapter 6 is "the application of geographic information exchange and share system-Jing'an geographic information exchange and share system". It mainly describes the running condition of system on GIS platform in the Information Center of Jing'an district. Chapter 7 is "conclusion and expectation". It firstly concludes the whole research, and then describes the production. In the end of this chapter, the author brings forward the futher research direction at next step.Achievements in the paper are summarized as following:â‘ Designs the frame of geographic information exchange and share system based on many advanced information technology, such as Web GIS, Spatial Data Organizing and Management, Web Service and Component with J2EE.â‘¡Designs a table of essential metadata standard based on researching.(3)Puts forward the technique of database connection in order to resolve the shortage of primary database link method. Particularly the author studies some of key techniques in GIS, such as geographic information upload, spatial data store into database, spatial data and metadata download and many other techniques.