Two-Dimensional Topology Structure between Vector Layers in GIS

Queries in Spatial databases, such as Geographic Information Systems, are often based upon the relationships among spatial objects. Unfortunately, currently used GIS software do not support complete topological structures. As such, answering topological queries is time consuming, if not impossible. In this paper, the 9-intersection model is implemented using ActiveX and Dynamic Link Library (DLL) Technologies. The main characteristic of this package is to create complete topological relationships between 2D objects in a GIS environment. Results of the test have shown the superiority of the proposed structure versus current commercial GIS software