Hunan Key Laboratory of Geospatial Big Data Mining and Application Hunan Normal University Changsha 410081 ChinaSchool of Surveying and Mapping Engineering East China University of Technology Nanchang 330013 China;
Hunan Key Laboratory of Geospatial Big Data Mining and Application Hunan Normal University Changsha 410081 China;
School of Surveying and Mapping Engineering East China University of Technology Nanchang 330013 China;
School of Surveying and Mapping Engineering East China University of Technology Nanchang 330013 China;
UAV; Low-altitude RS technology; Road safety; Road repair; Road detection;