ACCURACY EVALUATION OF 3D MODELS BY USING UNMANNED AERIAL SYSTEM
Modern needs for cadastral work on urban territories provided active introduction of unmanned aerial systems, including for the creation of 3D models of real estate objects. The created 3D models should provide appropriate spatial accuracy for reference points’ determination of object boundaries, which nowadays is regulated only with respect to the planned component.The objective of the study is to develop a methodology for assessing the accuracy of 3D models of real estate objects based on aerial photography at various altitudes, using the example of a reference polygon.The study is an experiment. And the 3D model of the reference polygon was created on the basis of this experiment, which meets modern requirements of Unified State Real Estate Register. The model accuracy does not essentially depend on aerial photo altitude and resolution. To determine the mean square error in the 3D model of the object, a method was developed based on the theoretical justification for the possible use of the plan-altitude control points as reference points, and further comparison of the coordinates and heights of the data points obtained from the 3D model with the reference values. The developed methodology can form the basis for normative legal acts on the accuracy evaluation of real estate objects’ 3D models in the cadastre, as well as be used by cadastral engineers for performing various types of cadastral work.