Inherited Technique of Data Model in Different Stages in Digital Mapping

Based on the third generation geography database model and the point-routing-boundary (PRB) data model, this paper explains that the PRB data stream stack is the inherited and transferred foundation of data models in different digital mapping stages. This is done by using the relationship between the PRB data stream stack and different-stage data model. It shows that the date model of the database, which includes the final-interpretable results, can inherit from the integration of the different-stage structure and non-structure data model, and clarifies that the inherited and transferred technique of spatial and no spatial attributes have been implemented by using inter-operation between object class and feature class. At the same time, in terms of the data molding principle of the integrative describing geological map, organizing data and storing data, it is concluded that the PRB data model of the PRB geological map spatial database is composed of seventeen basic feature classes, six object classes and eight synthetic feature classes. This paper also defines and discusses some elements of the PRB data model, including entity names, feature and object class coding, spatial data types, entity relationships, primary and subordinate key names, coding of feature classes notation, and entity attributes.