River topography information generation method using drone and geospatial information

摘要

The present invention relates to a method of generating stream topographical information using a drone and spatial information and, more particularly, to a technique of generating a DEM by processing an inclination technique and an area expansion technique by means of spatial information technology from three-dimensional DSM data acquired by a drone. A study site is selected and drone images are acquired. Orthophotos and DSM data are constructed through image matching. Since the constructed DSM data includes vegetation and trees in a stream, the inclination technique is applied based on point cloud data obtained during UAV photographing so as to generate the DEM based on a stream ground. After 100 verification points are selected, altitude accuracy of the DSM and DEM data is evaluated by using a measurement value calculated through virtual reference station (VRS) measurement and total station measurement, thereby providing reliability of the DEM data by drone point cloud-based inclination technique.