Taiwan Provincial Highway 18 Alishan Highway experienced sporadic rockfalls along its slope because of a five-day fire. To label the location a disaster region and estimate the fire-burned area to provide relevant post-disaster data for mitigation purposes, Chung Hsing Surveying needed to survey the site. They used airborne and ground-based LiDAR scanning on prior survey projects, but given the high costs, insufficient maneuverability, and limited viewing capabilities, they sought comprehensive reality modeling technology.
They used ContextCapture to process drone-captured aerial photos into a 3D reality mesh, modeling the disaster range of the upper and lower slopes of the area to provide a reference for subsequent slope cleaning and renovation projects. Bentley’s reality modeling application enabled immediate visualization and analysis, reducing on-site survey time by 30 resource days and costs by TWD 500,000. By comparing the model with various pre-disaster aerial telemetry and terrain data, they could determine the scope of the fire’s impact.