基于无地面控制测量校正影像的无人机航测应用

Application of unmanned aerial vehicle surveying and mapping in emergency investigation without ground control survey corrected image

以四川省北川县陈家坝乡太洪村唐家湾滑坡为例,介绍了无人机航测在滑坡地质灾害应急调查中的优势与作业流程,并阐述了无人机航测获取灾区正射影像图(DOM),制作数字高程模型(DEM)等一系列数字产品和进行灾害解译分析的方法。由于灾情紧急,没有充足时间在调查区域内做地面控制测量,存在一定的精度误差。为了验证无人机航测成果是否能满足此次应急调查的需求,使用地面三维激光扫描仪采集滑坡重点区域数据制作数字高程模型,并且引用滑坡发生前已通过地面控制测量校正的前期影像,将这2次数据分别与此次无人机航测获取的数据进行叠加配准对比以验证精度,从而证明了无人机航测应用于滑坡地质灾害应急调查的可行性和可靠性。

Taking Tangjiawan Landslide at Taihong Village,Beichuan County,Sichuan Province as an example,this paper introduces the advantage and operation procedure of UAV surveying and mapping in landslide geological hazard emergency investigation,and the producing methods for digital products such as Digital Orthophoto Map（ DOM） and Digital Elevation Model（ DEM） in disaster analysis. Due to emergency,there is no sufficient time to conduct the ground control survey,inducing a certain degree of errors in accuracy. In order to verify whether UAV survey results meet the emergency investigation demand,DEM from 3 D laser scanner collected landslide data in key areas and the early images that were corrected by ground control survey before the landslide were used to compare the UAV mapping data＇s accuracy. It proves that the feasibility and reliability of UAV surveying and mapping in landslide geological hazard investigation.