An SVG-based method to support spatial analysis in Web environment --Spatial analysis in XML/GML/SVG based WebGIS

This paper discusses how to provide spatial analysis for XML/GML/SVG based WebGIS. In recognition of current XML/GML/SVG based WebGIS’s insufficiency of providing spatial analysis, we focus on two important issues. First, based on the theory of spatial data modeling, we propose an SVG-based spatial information representation model to represent the needed spatial data in SVG on the browser side. Furthermore, this paper designs and implements some spatial operators and integrates them into a Spatial Extended SQL (SESQL) to support spatial query and analysis on spatial data which is represented in GML/SVG. This method can greatly improve the functions of current XML/GML/SVG based WebGIS applications, most of which have been only employed for visualization. Finally, this paper designs some case studies. The results of the case study prove that the suggested method is feasible and operable for providing spatial analysis in XML/GML/SVG based WebGIS.