无人机遥测技术在水土保持生态果园改造监测中的应用

以江西水土保持生态科技园为研究区,通过无人机遥测技术以及地理信息系统,对生态果园水土保持措施进行图斑化、信息化管理研究.结果表明:无人机遥测技术获取的不同阶段的航飞影像可用于生态果园改造的动态监测;利用Agisoft photoscan软件处理航飞影像可生成高分辨的数字正射影像(DOM)以及数字地表模型(DSM)数据;利用生成的DOM,结合地理信息系统,可获取生态果园水土保持措施的分布、数量、长度等信息,建立生态果园水土保持措施数据库,并输出报表和专题图.经与实际量测长度验证,基于DOM提取的长度平均精度为97.99％;与实测坡度验证,基于DSM数据提取的坡度平均精度为88.91％.无人机遥测技术能够快速、准确、自动获取地物的面积、长度、坡度等指标数据,可满足当前水土保信息化的要求,提升综合治理项目实施监测的信息化水平,提高施工监测的质量和效率.

UAV remote sensing technology in the application of the ecological orchard construction of soil and water conservation

Background] With remote sensing technology developing,UAV remote sensing has been widely used in the domestic and varied international industries in recent years.Soil and Water Conservation Informatization Planning of China (2013-2020),published by the Ministry of Water Resources of the People's Republic of China,points out that it is necessary to improve the level of informatization on soil and water conservation.Jiangxi Eco-Science Park of Soil and Water Conservation is the first demonstration park of soil and water conservation ecological science and technology of China,and was selected as the study area.Methods] UAV,RS,and GIS technologies were introduced into monitoring soil and water conservation.Firstly,182 images obtained by UAV remote sensing in 6 different stages in study area,including before transformation,in transformation and after transformation,were used for the process monitoring.And then Trimble GEOXT2008 handheld GPS was used to acquire 15 ground control points.Secondly,Agisoft photoscan was used to process the UAV images and generate digital surface model (DSM) and digital orthophoto map (DOM) of study area.The class,quantity and distribution of soil and water conservation measures were obtained from the DOM data by GIS software ArcMap.Finally,tape was used to measure the actual length of some soil and water conservation measures for validating the length accuracy extracted from DOM,and inclinometer was employed to measure the actual slope of eight points for validating the slope accuracy extracted of DSM.Results] The UAV images monitored the details of the transformation,and clearly showed the construction progress of different stages.We also explored a way to process the UAV image and build DOM and DSM by Agisoft photoscan.The image resolution of DOM was 2.35 cm and the resolution of DSM was 4.7 cm.Then information of extracted soil and water conservation measures included sand chamber,reservoir,master channel,water pipe,dropper main pipe,dropper branch pipe,and underground channel from DOM by GIS software ArcMap,and also the soil and water conservation measures database was established.Finally,we made the distribution map of soil and water conservation measures by DOM,and obtained the slope map of the study area by DSM.The average length accuracy of DOM data was 97.99％,length max accuracy was 99.73％,and the slope average accuracy of DSM data was 88.91％.Conclusions] By UAV remote sensing system,the area,height,length,slope and some other attribute data of the observed objects may be obtained quickly,accurately and automatically,which may meet the requirements of current soil and water conservation information,and improve the information level of comprehensive management project monitoring and the construction monitoring quality and efficiency.