Of Gis Integrated With The Model Space Discretization Method

The integration of GIS with professional application model is an inevitable developing trend from general application system to spatial decision supporting system(SDSS), the spatial dispersion is the bridge of integration.The spatial basic method of the distribution mechanism process model in geography and geology is graticule subdivision, namely, the space in succession will be divided into several individual calculation units according to definite rules.Firstly, the paper introduces the features, theories and implementation methods of several basic calculation meshes. And then, the automatic, semi-automatic technique of calculation meshes including graticule mesh, finite element mesh and orthogonal curvilinear grid supported by GIS are discussed. The paper also indicates thatgraticlue mesh comprises foursquare mesh( Ax = Ay ), rectangle mesh( Ax * Ay ),alterable rectangle mesh( Ax, * Ax, *......* Ax,, , Ajy, * A_y, *......^ Ayn ) androtatable rectangle mesh. And how to treat with river bifurcation and isolated islands in creating orthogonal curvilinear grid are also discussed. In addition, the mesh creation, data storage, mesh adjustment and the optimization of the model borders are also analyzed. Finally, taking the integration of GIS with 2D and 3D models as examples, the paper explains how to create the mesh from interface implementation, file storage and data transfer.The integration technique in the paper is put into practice in some successful engineer cases such as information system of environmental protection, digital system of Yangtze River and management information system of water resource, which also improve the technique gradually.