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WebGIS is a hot research topic in the field of GIS applications, the WebGIS overcome traditional desktop GIS application limitations, GIS applications with real information sharing, huge expansion space. With the development of network technologies, especially Web-based information publishing and retrieval technology, the rapid development of the net computing technology and network of distributed object technology, led to a lot of the architecture of the application system from C / S structure to a more flexible B / S multi-level distribution structure evolution of software systems network architecture entered a new stage. Starting from the current WebGIS the status quo, this paper focuses on a client layer, business logic, application logic layer, data layer multilayer WebGIS model and application requirements for the the Huairou District Water water resources management system, based on MapObjects2.0 ASP.NET technology to build a distributed system architecture, ActiveX controls, and Web Service technology-based WebGIS B / S mode. Browser to access local space data to map the basic operation of the proposed local high efficiency; client edit spatial data update operation, and collaborative Web Service service, complete the updated spatial data is uploaded to the server, and The server-side spatial backup data synchronization operations. Thinking based on this architecture, an extension of the client mode, and the extended client integrated the advantages of thin clients in the central management, and fat client flexibility, better response effect, and high-performance. Extended client mode, the system can make full use of the local client resources and network resources, but also remote intelligent installation and version updates. Extension client is an innovative model, the Huairou District Water water resources management system is designed based on the model. The system uses B / S structure, so that the user can view the water resources information anytime, anywhere. The management and maintenance of the system is based on a Web page, on any networked computer can be greatly facilitated the work of system administrators, mobile maintenance and remote maintenance. GIS functionality in the system, make full use of the spatial data distribution of client client distribution expansion of the concept of client and GIS operations, for the average user to provide a fast and efficient GIS functional operation. The system is reliable, stable operation, easy to operate, is a set of technical innovation, very practical business operating system for the water business people have great practical value, decision analysis provides strong factual data basis .
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