3D GIS MODELING APPLICATION FOR DEVELOPING THE BUTUAN CITY 3D MODEL

ABSTRACT: This paper deals with the methods employed for the development of the 3D models of the establishments of Butuan City to be used further for real property assessment and flood simulation. The development of the 3D models was done by first extracting building footprints from the orthorectified satellite image of the study area. While a LiDAR data was used to calculate and manage the height of each buildings. A Digital Terrain Model (DTM) was also generated to be used as terrain and as a base layer of the 3D buildings. The digitized building footprints and the DTM were both an input data for the development of the 3D models within the ESRI CityEngine environment. Field surveys were then conducted to collect actual photographs of the buildings in the study area, which are vital in adding texture to the building model and a good reference on building structures. The processes on extruding, re-shaping, subdividing, adding textures, and forming the structures of the buildings were done manually with the aid of the conventional tools of the CityEngine. Outputs of this study show that a better representation of the city by employing 3D GIS modeling can be achieved. Further, the developed 3D city models are expected to enhance future endeavors on real property assessment and monitoring and in mitigating flood events in the City of Butuan, Philippines