JAUE2022-126: A study on RMSE comparative analysis of Ortho-image based on GNSS and RTK UAV images

Abstract

Unmanned Aerial Vehicles (UAVs) are attracting a lot of attention in the field of geospatial information construction because of their rapidity and economic feasibility of data acquisiton. When producing ortho-images using UAV, high accuracy is required, so the use of Ground Control Point (GCP) is essential. But, there are cases where the installation of GCP is difficult, such as at sea or in a large area, in this case, use the non-GCP method that does not install GCP. However, it is evaluated that the ortho-image constructed with non-GCP has a large position error and the accuracy is insufficient. Therefore, we intend to analyze the accuracy by producing ortho-images using Global Navigation Satellite System (GNSS) and Real-Time Kinematic (RTK) UAV at non-GCP and comparing the Root Mean Square Error (RMSE) of ortho-images. An aerial photograph was conducted by selecting an appropriate target site. The results of this study were as follows; The RMSE of GNSS was RMSE X=15.1404cm RMSE Y=10.6756cm RMSE Z=31.8498cm and the RMSE of RTK was RMSE X=0.2011cm RMSE Y=0.2077cm RMSE Z=0.9218cm. According to the relevant regulations, the limit value is H/1,000, so the limit value of this study is 8 cm. As a result, GNSS is not suitable and RTK is suitable. Therefore, only ortho-images generated by shooting with RTK UAVs can be used as digital topographic maps.