Reconstruction and accuracy analysis of landfill piles-based aerial imagery

Accurate monitoring of landfill changes and accurate assessment of effective storage capacity can provide an important basis for managers to make scientific decisions and rationalize resources. UAV tilt photogrammetry technology has the advantages of flexibility, fast data acquisition and high accuracy, and is widely used in many fields, but the problem of how to select the best flight parameters of UAV to make the reconstruction model more accurate needs to be studied. In this paper, we simulate the amount of landfill in a landfill site and take aerial images of the simulated area by UAV to study the influence of three factors, namely, the flight height of UAV, the tilt angle of camera and the side overlap rate of images, on the accuracy of reconstructed model. The results show that when the UAV flight height is within 25-37 m, the higher the accuracy is, the camera tilt angle is at [-60°, -53°], and the overlap rate is at 80%, the error decreases abruptly and basically remains stable. If we consider the size of landfill, operation time interval, UAV endurance and other constraints on flight time, it is recommended that the flight height is 37 m, the camera tilt angle is [-60°, -53°], and the bypass overlap rate is 80%, so as to ensure the best accuracy under the flight time constraints.