Abstract
Abstract. In recent years, 3D models have been created of many cities around the world. Most of the 3D city models have been introduced as completely graphic or geometric models, and the semantic and topographic aspects of the models have been neglected. In order to use 3D city models beyond the task, a generalization is necessary. CityGML is an open data model and XML-based format for the storage and exchange of virtual 3D city models. Level of Details (LoD) which is an important concept for 3D modelling, can be defined as outlined degree or prior representation of real-world objects. The paper aim is first describes some requirements of 3D model generalization, then presents problems and approaches that have been developed in recent years. In conclude the paper will be a summary and outlook on problems and future work.
Highlights
1.1 General InformationsMap is an abstraction of reality and fundamental language of geography, symbolize image of geographical reality
This study describes generalization, 3D models, and generalization problems of 3D models, Multi-representation databases (MRDB) and Levels of Detail (LoD)
It is suggested and explored that combining the LoDs in the CityGML detail level and MRDB levels for more useful systems can be created for automatic generalization
Summary
Map is an abstraction of reality and fundamental language of geography, symbolize image of geographical reality. The symbols, directions, lines and legend all require some understanding before to start reading a map effectively. To understand maps and extract information of them, maps must be accurate and made according to certain rules, design stage is significant (Uluğtekin and Doğru, 2005; Uluğtekin and İpbüker, 1996). This paper aim is combining the Levels of Detail (LoD) in the CityGML structure and Multiple Representation Database MRDB representation levels. Thereby, this combination can be used for approach to some of generalization problems. This paper propose a schema for 3D building generalization (Uyar and Ulugtekin, 2017)
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