应用于土地确权的无人机遥感影像DEM生产探讨
2021-09-30于学广李芳芳
于学广 李芳芳


摘 要:土地承包经营权确权需要以正射影像作为工作底图,因此需要采用分辨率优于0.2 m的真彩色数码航空摄影并处理制作分辨率优于0.2 m(1∶2 000)的数字正射影像图(DOM),局部区域采用分辨率优于0.5 m的遥感卫星数字正射影像图(DOM)制作并形成用于调查和实测的基础工作底图。作为DOM生产的基础,该文探讨了应用于土地确权的数字高程模型(DEM)的生产过程。对DEM生产中空三加密处理等进行了详细规划与实施,建立了DEM作业步骤及主要技术指标,进行了精度检查等工作。
关键词:DOM DEM 土地确权 空三加密
中图分类号:P231 文献标识码:A文章编号:1672-3791(2021)06(c)-0031-03
Discussion on DEM Production of UAV Remote Sensing Image Applied to Land Ownership Confirmation
YU Xueguang1 LI Fangfang2
(1.Beijing Branch of Hebei Xiangtong Information Technology Co., Ltd., Beijing, 100191 China; 2.Zhongke Remote Sensing Technology Group Co., Ltd., Tianjin, 300384 China)
Abstract: The confirmation of land contractual management right needs orthophoto as the working base map. Therefore, it is necessary to adopt true color digital aerial photography with resolution better than 0.2 m and process to produce DOM with resolution better than 0.2 m (1:2000). In some areas, DOM with resolution better than 0.5m is used to make and form basic working base map for investigation and measurement. As the basis of DOM production, this paper discusses the production process of DEM applied to land ownership confirmation. In this paper, the detailed planning and implementation of the digital elevation model (DEM) production are carried out. The detailed planning and implementation of aerial triangulation processing in DEM production are carried out, the DEM operation steps and main technical indexes are established, and the accuracy inspection is carried out.
Key Words: DOM; DEM; Land right confirmation; aerial triangu lation
低空無人机测绘遥感系统主要由航拍无人机、任务负载系统和数据处理系统组成。利用低空无人机进行航拍,在测区快速获取大尺度4D产品,由于天气干扰小,成为一种高效、廉价的遥感制图方法。无人机配备摄像设备和倾斜拍摄设备,用于环境安全开发利用,实时监控,为决策部门提供及时准确的数据信息,以更好地服务国民经济绿色发展[1]。
该项目航拍计划使用UAVRS-20无人机完成航拍任务。照片相机使用佳能5D Mark II数码相机来获取图像。图像拼接使用随机软件完成,并计划使用内部处理。数字摄影测量工作站MapMatrix、南方凯思软件完成了整个航测内部工作,实现了照片与地图制作流程的一体化。整个DEM生产流程如图1所示。
1 无人机飞行设计
1.1 航区与航线设计
(1)航摄分区的划分。摄区地形高差相差较小,根据规范要求可不用分区。……
