3D BUILDING GIS DATABASE GENERATION FROM LIDAR DATA AND FREE ONLINE WEB MAPS AND ITS APPLICATION FOR FLOOD HAZARD EXPOSURE ASSESSMENT

ABSTRACT: Identifying buildings that are exposed and vulnerable to flooding is important in flood disaster preparedness, risk assessment, and mitigation. In most cases, the availability of a 3D building database where each building is attributed in terms of name, type (e.g., residential, commercial, government, educational, etc.), and height (among many other attributes) makes the required analysis fast, efficient and informative. In this paper, we highlight the usefulness of a 3D building database generated from LiDAR data and free online web maps in assessing the exposure and vulnerability of buildings to flooding through a case study made for Cabadbaran River Basin, Mindanao, Philippines. The results of this case study consist of a series of maps and statistics showing exposure and vulnerability of buildings to flooding that can be utilized by Local Government Units and the communities in the river basin in their flood disaster risk reduction and management strategies. Flooding is one of the most destructive natural disasters in the Philippines. It can cause loss of lives and damages to properties as well as to infrastructures like buildings, roads and bridges. Excessive quantity of rainfall brought b