Webgis-based Distributed Environment Research And Design

Geographic Information System (GIS) is a database management system for getting, storing, searching, analyzing and displaying spatial data. It consists of most advanced techniques such as graphics, image, geology, geography, remote sensing, surveying, artificial intelligence, computer science and so on. GIS is one of the most promising and attractive research fields. From 1960s on, it has made great progress all over the world, not only on its system theory, but also on its research method and applications. With the development of related technologies and the need of practical applications, the prospect of GIS is Data Standardization, Data Multidimensional, System Integration, System Intellectualization, Platform Network and Application Socialization.The World Wide Web technology, having rapidly developed from 1990s, brings request to the development of traditional GIS. It is emergency for us to explore how to use World Wide Web as the distributed computing platform for GIS, how to release Geographic space data and information in the internet and how to make it easy for users to search the geographical information which was needed in the internet. On the other hand, World Wide Web is also a good way for reducing geographical data collection cost and advancing geographical information share degree. It is the foundation of the GIS' s socialization and popularization.GIS is penetrating into all kinds of fields, and the rapid application of computer network is accelerating the evolution of the WebGIS from traditional GIS. The combination of GIS with the network technology is an important developing direction of the present GIS research field, and the constructing of distributed GIS, the WebGIS, is the trend for the developing of GIS.The key technology to solve the problems which exist in WebGIS is using distributed computing technology, distributed database technology and distributed object technology. Firstly, this paper contrapose thedisfigurements which exist in the internal GIS software, the trend and technology of GIS in the era of INTERNET was discussed. Secondly, using distributed computing technology to solve the problem of speed, making use of distributed database technology to settle the data distribution and share problem and utilizing distributed object technology to solve the problem of integrating the subsystems. Finally, according to analysis for actual problem I have met in my developing process, this paper put forward a blue print which is very available to WebGIS based on distributed environment.