A Study on the Displacement Measurement of the Slope using Network RTK UAV

Abstract

Recently, research in various fields using unmanned aerial vehicles has been underway and has been applied in various fields due to increased accuracy and precision. In particular, the spread of unmanned aerial vehicle (UAV) equipped with real-time kinematic (RTK) is smooth, and there is a growing interest in how to increase accuracy and precision while using a cost-saving method and ground control point (GCP). This study attached reflective sheets to the pile head for accuracy evaluation for small-scale slopes with small ends, established the initial position using the backward intersection method, observed the pile head, and used it as a checkpoint. Accuracy analysis of survey results was performed using UAVs equipped with RTK equipment at a low altitude of 25 m (AGL). As a result, when using a GCP, 3D RMSE was able to obtain an accuracy of 5.035 mm in the x-direction, 7.005 mm in the y-direction, and 7.664 mm in the z-direction In the case of not using a GCP, an accuracy of 32.986 mm in the x-direction, 5.718 mm in the y-direction, and 9.499 mm in the z-direction was obtained.