The Construction of WebGIS based on Three-Layer B/S and XML

WebGIS developd the funtion and enlarge the field in traditional GIS, as the desk for information distribution, open Internet makes GIS more public.With the development in application, the demand for using data in different GIS databases became critical, so more and more efforts will be devoted to the research in this fields.With open and self-describing ability, XML rises an effective standard; on the other hand,the three-layer B/S gives a good model for data using in different structures.So there must be a good future in using of WebGIS.This paper firstly briefs introduce for WebGIS, XML and the three-layer B/S structure and then gives a rudimentary research in the combination of these.