Abstract
The investigation of emergency environment of flood and waterlogging disaster focuses on real-time and timeliness, which is the need of disaster analysis and emergency rescue.The airborne three-dimensional laser scanning system (LiDAR) is flexible and less affected by the weather. Moreover , it has the characteristics of being able to penetrate the leaf canopy of vegetation directly to the ground .Based on these characteristics, liDAR technology is proposed to obtain detailed topographic and geomorphic data in small area.Through the investigation and study of small watershed in the south of Jinan, this paper systematically introduces the working principle of airborne LiDAR, data processing process, and the specific process of obtaining high-precision DEM and surrounding topography.Application cases show that by means of airborne lidar to obtain small watershed basic geographic information, the data processing speed and the precision and quality of data and subsequent digital products can meet the needs of flood disaster emergency investigation.It provides basic geographic information data for analyzing flood and mountain flood prevention and control work caused by short-term flood.
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