Micro Landform Extraction Based on UAV Photography Technology?Taking Kunzhong Fault (Balong Wenquan Section) as An Example

Uav measurement has the advantages of high definition, large scale, small area and high present situation, providing more accurate and reliable quantitative parameters of active structure for geomorphic parameter acquisition, overcoming the shortcomings of traditional measurement methods such as heavy workload, low efficiency and limited by natural conditions, and providing centimeter-level positioning data, thus significantly improving the absolute accuracy of image metadata. In this paper, the high-precision DEM landform data of Kunzhong fault (Balong Wenquan section) in Longtong village are obtained by using Dajiang spirit 4rtk multi rotor aerial survey UAV. Through the extraction of micro landform, it is preliminarily determined that the horizontal dislocation of the fault is 2.1 ～ 15.4 m. According to the analysis of the eight scarp profiles obtained, it is considered that five scarp is less eroded by water flow after its formation, the height of the scarp is basically similar, and the actual vertical dislocation of the fault is about 0.6～0.9 m. It is preliminarily considered that UAV aerial survey technology is an effective means to identify complex geomorphic structure information and extract relevant active structural parameters, which provides a reliable data basis for the quantitative study of faults.