Urban models are highly useful in city planning and 3D visualization. These models include different items such as bare earth, buildings, trees, roads, and other non-terrain objects. In recent years, the demand of the urban model has increased, and the three dimensional models that have been generated by different methods can be transferred into geographic information systems (GIS) easily and used as a base for GIS applications including urban planning, architecture, and environmental modeling.
Light detection and ranging (lidar) technology has continued to draw great attention from GIS users. Because large volumes of lidar data can be produced, studies have been made toward the goal of handling lidar data in GIS software for classification or object extraction. This presenation makes the attempt to propose methods and develop tools for bare earth extraction and 3D building reconstruction models by integrating lidar points.