The study of flight elevation and speed of UAV Photogrammetric accuracy for mapping.

Abstract

This study aims to evaluate the effect of flight elevation and speed to accuracy of landfill mapping by using Low-cost Unmanned Arial Vehicle (UAV) photogrammetry. The study site located at landfill site that covers 10 Rai (16,000 square meters). Flight configuration was set up including 80% of frontal overlap and 75% of side overlap at Ground sampling distance (GSD) 3.5 and 5 cm/pixels. The picture trigger modes of UAV’s flight were set to safe mode (stopping to capture) and fast mode (flying to capture). The Ground control points (GCPs) were set up at 5 positions and check point (CPs) were set up at 15 positions, respective. The Agisoft Photoscan Professional V.1.4.4 software was used for data processing in order to generate densified point cloud, digital elevation model, and orthoimage. The accuracy of GCPs and CPs were evaluated by Root Mean Square Error (RMSE) values and followed the American Society for Photogrammetry and Remote Sensing (ASPRS) 2014 standard. The result showed that GSD at 5 cm/pixel with safe mode gave the best accuracy both horizontal and vertical positions which can be used for the highest accuracy work. For Vertical accuracy evaluation, the result was in the 5-cm vertical accuracy class.