一种基于无人机倾斜摄影的高精度单体三维建模方法  

High-precision Monomer 3D Modeling Method Based on UAV Oblique Photography

作　　者：褚宁 米川 CHU Ning;MI Chuan(Mineral Resources Exploration Center of Henan Geological Bureau,Zhengzhou 450006,China)

机构地区：[1]河南省地质局矿产资源勘查中心,河南郑州450006

出　　处：《地理空间信息》2023年第11期9-14,共6页Geospatial Information

基　　金：2021年甘肃省高等学校创新基金资助项目(2021B-463)。

摘　　要：传统倾斜摄影测量在同时获取正射和倾斜影像数据时,往往对建筑物低空立面纹理采集不够精细,且多数建筑物或地物模型毗连成片,不利于单独管理与使用。鉴于此,提出了一种高精度单体三维建模方法。首先结合建筑物几何特征和分辨率需求,研究三维环绕式航线设计方案,采集覆盖全局的高分辨率影像数据;然后将倾斜摄影模型的点云划分为虚拟网格,并将每个虚拟网格中的点云视为一个整体,通过设置高差提取建筑立面的点云,经点云分类处理,进一步提取轮廓信息;最后通过提取轮廓线相交三角形,实现单个建筑模型的三维构建。结果表明,该方法能自动、高效地单体化构建倾斜摄影建筑模型,对工程建设与发展具有一定的应用价值。When traditional oblique photogrammetry obtains orthophoto and oblique image data at the same time,the collection of low altitude facade texture of buildings is often not fine enough,and most buildings or ground object models are adjacent,which is not conducive to separate management and use.In order to solve the above problems,we proposed a high-precision monomer 3D modeling method in this paper.Firstly,combining with the geometric characteristics and resolution requirements of buildings,we studied the design scheme of 3D surround route,and collected the global high-resolution image data.Then,we divided the point cloud of oblique photography model into virtual grid,and regarded the point cloud in each virtual grid as a whole.We extracted the point cloud of building facade by setting the height difference,and further extract-ed the contour information after the point cloud classification processing.Finally,we realized the 3D construction of a single building model by extracting the intersecting triangles of contour lines.The experimental result shows that this method can automatically and efficiently realize the monomer construction of oblique photography building model,and has a certain application value for engineering construction and development.

关 键 词：无人机 倾斜摄影测量 单体化模型 三维环绕 虚拟网格 

分 类 号：P231[天文地球—摄影测量与遥感]