QUALITY ANALYSIS OF 3D MODELS BASED ON DIGITAL PHOTOGRAMMETRY

Abstract

The main focus of the paper is the assessment of the quality of the 3D terrain models obtained from the images of unmanned aerial vehicles (UAV). Quality and detailed terrain models are necessary, above all, for precise determination of changes in the area of excavation. The quality analysis of the 3D model includes the degree of deviation of geometric and geomorphological characteristics from the actual terrain position and status in nature. To determine the geometric accuracy, a comparative method of testing is used, ie a comparison of the measured values of the 3D model with the data of well-defined geodetic and control points a posteriori measured using the Global Navigation Satellite Systems (GNSS). Analysis of quality and comparisons are performed visually, numerically, by calculating the excavation volume and creating a terrain profile. The results suggest that the 3D models obtained from the UAV images are of very high quality. Also, an important advantage of using UAV images to generate 3D models in the excavation area is their efficiency, for example, more frequent updating and measuring the height of inaccessible terrain and determining local changes in the terrain.

Keywords

• quality
• 3d model
• excavation area
• uav
• land survey