基于无人机航测及水下地形测量的水利工程高精度DEM构建研究

DEM是水利行业最主要的基础地理数据之一,本研究根据无人机航测构建密集点云,再对密集点云进行滤波处理,分类地面点,派生出高精度地面DEM,结合水下地形测量,绘制水下地形图,插值得到研究区高精度河道DEM.对地面DEM和河道DEM进行叠加处理,得到研究区整体DEM数据,通过质量检查可知,DEM的高程精度处于较高的水平.本...

Construction of High-precision DEM for Water Conservancy Project Based on UAV Aerial Survey and Underwater Topographic Survey

DEM is one of the most important basic geographic data in the water industry.Based on UAV aerial survey,this study constructs dense point clouds,and gets the ground points from filtered dense point clouds,then derives high-precision ground DEM according to the ground points.Combined with underwater topographic survey,this study draws underwater topographic maps,then constructs high-precision riverway DEM in the study area.The overall DEM data of the study area is obtained by UAV aerial survey and underwater topographic survey,according to the quality inspection,the elevation accuracy of the DEM is at a high level.With the advantages of high work efficiency,high precision of DEM and strong current situation,the DEM construction method proposed in this research has greatly reduced the workload of field surveying and mapping,which provides guarantee for the development of various water conservancy work.