| In this thesis, actuality and limitation of hub traction and power supply's SCADA system is analyzed in the beginning, and then how to apply WebGIS in SCADA system is discussed thoroughly, combined with the request of the SCADA system to GIS. A distributed SCADA system with WebGIS is designed based on the technique such as DCOM/ActiveX, ASP... etc. Design for server is realized, and scheme of system security is proposed.And then, WebGIS, key subsystem of the whole system, is designed in the thesis. A series of groupware is abstracted according to this subsystem feature, and key groupware is devised in detail. The method of OOP is adopted for GIS data model of this system. Comparing more currently existing, database managing technique, the thesis proposes the object-relate database management system to manage GIS data, build GIS data-model according to system character, and design division of system information drawing level according to spatial database structure.Afterwards, a test environment for WebGIS is built based on SCADA system. The system adopts Maplnfo Professional to build a test-map, utilize Easy Loader for Oracle 8. 1. 6 to load the map data into Oracle, use Oracle Spatial to manage and store spatial data, and carry out the experimentation as follows: graphics design based on MapX, page manifestation and operation based on ASP, access to GIS database based on OCI API, real-time fault information monitor based on design of real-time communication with Socket technology, additional fault-location based on MapX fast search function.Finally, the writer concludes the whole work, analyzes the merit and shortcoming of the system, and points out the next work. |
