| Summary: | 碩士 === 國立成功大學 === 測量及空間資訊學系碩博士班 === 97 === Topographic maps have been one of the important sources to describe the real world. Cartographers transform the real objects into the variant meaningful symbols on the maps to present a specific theme or particular spatial information. Due to the development of computer graphics, 3D city models make people comprehend the real world more easily and completely. However regarding to the applications, 3D city models still cannot replace topographic maps entirely which means the topographic maps are still non-substitutable. In the other aspect, GIS is the major development in Geomatics in the future. Combining the 3D city models and GIS would be imperative.
Three main topics are contained in this research. The first is the common content between 3D city models and topographic maps. In order to determine the key points about the transformation between 3D city models and topographic maps, they should be analyzed by the consistency of corresponding features, object characterization and spatial accuracy. The second is the analysis of building structures for distinguishing the building- parts as the base of 3D building modeling. The third is to discuss how the 3D city models and GIS could be connected together. Based on the definition and composition of an entity, we propose the concept of entity-based 3D city modeling, and discuss the conditions and methods for the transition of 3D city models to GIS.
The results of this research can be seperated into three parts. First, there are two key points about the transformation between 3D city models and topographic maps. First, the identical measured object points should have the consistency between 3D city models and topographic maps, and second, the common feature points should have the same observation accuracy. Second, for the analysis of building modeling, the rules to distinguish main-part and accessories of a building should be clear. Third, the concepts and procedures for entity-based 3D city modeling we proposed in this thesis basically could reach the propose of transforming the 3D object models in the city into entities. Practically, both subjects about the automation and rules for entity-based 3D city modeling can be a further study in the future.
|
|---|
