File:MScThesis Ahmet SENGUL.pdf

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3D City Models are digital representations of the Earth’s surface and related objects belonging to urban areas. In order to get information about a city it is necessary to collect data from different sources. There are several methods of collecting the data such as LIDAR, laser scanning, surveying measurements, aerial and satellite images…etc. The 3D GIS data collected using with 3D geographic imaging can be used for spatial modeling, GIS analysis, 3D visualization and simulation applications. The collection of geographic data is of primary importance for the creation and maintenance of a GIS. CityGML defines the classes and relations for the most relevant topographic objects in cities and regional models with respect to their geometrical, topological, semantical and topological properties. 3D visualization and analysis of environmental properties is an efficient way of accessing the impact of urban projects. The main purpose of the thesis is to fill the gap between photogrammetric methods and CityGML data model which is XML (eXtensible Markup Language) based format for the storage and exchanged of virtual 3D city models. The main problem is how to create a link between the photogrammetric methods and CityGML which is a common information model for the representation of 3D urban objects. In order to fıll the gap FME (The Feature Manipulation Engine) is used during the thesis study. Furthermore, data model of photogrammetric methods has defined using UML (Unified Modeling Language) diagram. Additionally, building data model of CityGML is minimized from the specification document depending on the requirements of the thesis work. As a result of this study, the gap between photogrammetric methods and CityGML has been filled with FME the is conversion program. Moreover, the building model of photogrammetric methods has been created and also it is compared with CityGML building model. The differences and similarities of those models have also defined and also they mapped eachother with usıng UML diagram in order to understand better with the possible relations

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