Comparison And Accuracy Analysis Of Real-time Ground Target Positioning Method Based On UAV Image

In recent years,earthquakes,mountain torrents and other disasters have caused tremendous damage.After the disaster,the most important thing is the emergency response.How to quickly and accurately take measures to reduce losses as much as possible after the disaster,so the emergency Mapping is the main prerequisite for making an emergency response.However,traditional surveying and mapping methods such as RS and GPS have problems in obtaining time lag of data acquisition.Therefore,drone technology has gradually become the main force of surveying and mapping;however,the processing flow of surveying and mapping of drones is cumbersome,and it is unable to folly exert its needs in the face of emergency mapping.Advantageous effects,while using UAV technology to achieve real-time ground target positioning,due to weather,POS data and other reasons,the positioning accuracy is not high,and the reliability is poor.Therefore,the purpose of this study is to make up for the shortcomings of common surveying and mapping methods to meet the needs of emergency mapping.In this paper,two real-time ground target positioning methods are adopted:1.Real-time ground target positioning based on forward intersection,direct use of on-board POS data of multiple images and forward intersection algorithm to achieve positioning;2.Real-time ground target localization of single image Real-time ground positioning using single image POS data and high-precision ASTER GDEM global terrain data.In order to verify the reliability of the positioning results,this paper obtains the following conclusions through the accuracy evaluation and comparative analysis of ASTER GDEM elevation data,airborne POS data and the results of real-time groundtarget positioning by two methods:1.There is no direct relationship between the accuracy of the real-time ground target positioning based on the forward intersection and the number of images.The result of this positioning method has higher horizontal accuracy.The elevation error is a little larger due to the influence of airborne POS data;2.Compared with the method of forward intersection,the accuracy of the elevation of the single image is much higher than that of the forward intersection.It proves that the ASTER GDEM elevation data can make up for the large error of the POS data.3.The elevation accuracy of the ASTER GDEM data improves the positioning of the single image ground target in this paper,which can basically meet the needs of emergency mapping.