THE USE OF CITYGML 3.0 IN 3D CADASTRE SYSTEM: THE CASE OF ADDIS ABABA CITY

Abstract. The relevance of 3D cadastre is increasing from time to time as buildings become more complex. Modeling and storing the physical structure with all its elements in a standardized file format improve its usability in different sectors, reduces data redundancy, creates data consistency, maintainability and scalability would be more effortless. In cadastre, showing the legal right of a property is as important as showing the physical right. Especially when a property is multiple owned and has several uses where each use and owner have different rights, responsibilities, and restrictions. The current cadastral of Addis Ababa is a 2D parcel-based mainly focused on registering ownership and physical data. The system lacks to show overlapping ownerships and uses of multistorey buildings. This study solved this critical short come.

The primary goal of this study was to use CityGML to represent the physical and non-physical boundaries of building units. Prior to the release of CityGML 3.0, CityGML 2.0 was widely utilized in this field. However, there are several legal boundary modeling flaws in CityGML 2.0. Contrarily, those gaps were closed in the revised edition. Because of this, CityGML 3.0 was used in this investigation. Firstly, a sample building model was created and tested to demonstrate the concept sample. Then, the concept was realized on a model of an actual condominium building from the study area, Addis Ababa. The findings of the study demonstrate how CityGML 3.0 may be utilized for various 3D cadastre applications, including modeling the legal and physical boundaries of buildings.