Webgis Application Technology Research

WebGIS is a computer information system, which can store, manipulate, analyze, display and use geographic information in Internet/Intranet environment. It pays a great attention to how to deliver electric maps through Internet, which means that the user can manipulate a map interactively in browser/server environment, and need not to install any GIS soft in the client side.In this article, we compare and analyze the model of distributed computation, the technologies of storage and management of spatial data, the technologies of geographic data transmission in Internet, and the methods of developing WebGIS. Combined with the developments of GIS and database, a WebGIS solution is presented, which uses spatial database to manage spatial data and non-spatial attribute data, and uses GML as the transmission format of geographic data in Internet. At last, we use Java to develop an experimental WebGIS system, which is based on Oracle Spatial and GML.In this article we lay special stress on the settlement of several problems such as the development method of WebGIS according to the multi-layer distributed computational model, the data transformation between Oracle spatial and GML, and the method of parsing and presenting geographic data in GML format. The models and methods presented in the paper are useful for the development of WebGIS applications, which combines Oracle Spatial and GML.