微型旋翼无人机在水蚀外业调查中的应用

目的]提高水土流失抽样调查的效率和准确度,降低难度和成本。方法]应用微型旋翼无人机结合倾斜摄影测量技术,通过几何校正过程,多视图匹配,三角网(TIN)构建和自动赋予处理等步聚,建立调查单元的高分辨率正射影像和三维实景,然后通过人工解译的方法,得到调查区域内不同地块的边界和属性信息,代替传统现场勾绘的工作方式和技术流程。结果]应用微型旋翼无人机有效提高了调查地块边界的精度,同时降低了现场调查的难度和成本,大大节约了调查时间。结论]应用微型旋翼无人机提高了基于抽样现场调查方法的水土流失评价结果的可靠性,有利于促进抽样调查方法在各级政府水土流失评价中的采用,以及水土流失评价定量化技术的发展。

Application of Micro Rotor UAV in Field Investigation for Water Erosion

Objective] To improve the efficiency and accuracy of soil and water loss sampling survey, in order to reduce the difficulty and cost.Methods] First, photos with a certain amount of overlap covering the survey area were taken by the unmanned aerial vehicle (UAV). The ortho images and DEMs were then obtained by using the tilt photogrammetry technology, geometric processing, multi view matching, triangular mesh (TIN) construction and automatic processing. Instead of the traditional way of working and technical process, the boundary and attribute information of different plots in the investigation area was obtained by artificial interpretation.Results] The application of micro roter UAV improved the accuracy of the land boundary effectively, reduced the difficulty and cost of the field survey, and greatly saved the time of investigation.Conclusion] The application of micro rotor UAV technique has improved the reliability of soil and water loss assessment results, and is of great importance for promoting the application of sample survey methods in the evaluation of soil erosion in all levels of government, as well as the development of soil erosion quantification technology.