2021 Volume 37 Issue 2 Pages 29-38
To understand the labor-saving method of developing a high-accuracy three-dimensional model with reduced doming effect using an aerial photograph from a real time kinematic-unmanned aerial vehicle (RTK-UAV) without using ground control point (GCP), we examined the relationship between the camera angle, data processing method, degree of doming, and vertical accuracy of the model. Consequently, as the camera angle was tilted more, the effect of reduced doming effect and vertical error increased. Moreover, by optimizing the camera position accuracy according to the RTK, reducing the occurrence of the doming effect was almost completely possible. Furthermore, by optimizing the lens distortion model according to the RTK, reducing the vertical error within 2 cm was possible. To ensure operational efficiency, a combination of -70 ° of the camera angle, using “load camera location accuracy from XMP meta data" function of the photogrammetry software, and using "fit additional correction" function during lens calibration processing in the software was optimal. Furthermore, extremely high doming and vertical error reduction effects can be obtained even with a conventional method, which combines GCPs with non-RTK-UAV, by arranging GCP at the center of the measurement range.
