THE GIS CONCEPT AND 3-DIMENSIONAL MODELING

The GIS concept looks at the world as an ensemble of 0-, 1-, 2-dimensi onal static objects, each with homogeneous attribute values. The GIS f unctions allow to search, transform, manipulate, analyze, visualize th ese objects and even create new objects using overlay operations with real or simulated data. The DEM nowadays included in most of the GIS s oftware lifts its dimension only with 0.5 unit. This increasing of dim ension is connected with the alteration of the traditional view on obj ects. Even on this stage we can begin to develop a new, nonstatic obje ct concept. In the realm of 3D modeling (strictly speaking this is the only case of real spatial modeling) the objects are only shells of ch anging in the space and the time attributive data fields. To determine the nature of changes several methods of interpolation can be applied In geosciences the different modifications of kriging are widely used . On the other side, the requirements of visualization can be more eas ily fulfilled using the spline interpolation. A new interpolation meth od that combines the advantages of kriging and splines with computatio nal simplicity is shortly outlined. As conclusion, the introduction of the dynamic object concept is recommended.