This paper shows the application of the Molenaar formal data structure model in a MRDB--type database meant to objects automated elimination and simplification while scale changing and those objects visualization methods. Generalization process and visualization results objective criterions are established in the solution. In the elimination process there are classes and objects hierarchies used, which are based on the graph theory. The simplification process is based on the hierarchy of points describing the object, established using relative extrema. Both these processes verification is based on the drawing recognizability criterion. In the object simplification results visualization methods there are normal distribution's properties and drawing recognizability criterion used to establish so called generalization thresholds (of the simplified objects). The thresholds are used to establish the scales ranges for the generalization results visualization methods.
