Honcheriuk O. Methodical bases for the application of digital close-range photogrammetric data for architectural monuments monitoring

The main scientific and practical task of the work consists in developing new and improving existing technologies, mathematical models and techniques for architectural monuments monitoring using modern digital photogrammetry achievements, particularly the capabilities of modern digital non-metric cameras. The work presents an improved mathematical model and a method for performing the preliminary accuracy calculation of photogrammetric measurements using digital non-metric cameras equipped with modern smartphones and tablets. The analysis of the main sources of errors of digital non-metric cameras is carried out. Using the received total errors, a calculation of the accuracy of the photogrammetric models was made according to the formulas of the direct photogrammetric intersection. In the dissertation the analysis of the standard approach to the calculation of the parameters of surveying with the use of metric cameras and / or phototeodolites is performed. It is indicated that existing expressions for calculating the photographic parameters cannot be used when digital non-metric cameras are used. Existing expressions have been converted to digital form. The technique and mathematical expressions for calculation of photogrammetric surveying parameters using digital non-metric cameras are proposed. A detailed analysis of calibration models of digital non-metric cameras is performed. As a mathematical calibration algorithm it is proposed to use the method of direct linear transformation. The research of well-known mathematical models of calibration by a direct linear transformation method was performed and the optimal models of calibration were determined. A detailed analysis and practical experimental research of software tools for calibration of digital non-metric cameras are carried out. The classification of software tools is proposed based on cost criteria, models for taking into account the distortion of the lens, stability and accuracy of the computational algorithm. A general analysis of the results showed that when calibrating, the advantage should be given to programs such as PhotoModeler, and with financial constraints for programs such as Fauccal for Matlab. The conducted research allowed offering the technology of choice of the optimum method of calibration of digital non-metric cameras in solving problems of architectural monuments monitoring. Experimental studies of the influence of calibration accuracy of digital non-metric cameras on the accuracy of architectural models creation are carried out. Compared with the results obtained without calibration, the overall increase in the accuracy of the determination of coordinates was approximately 25%. On the example of documentation of the fortifications of the Second World War in the city of Kiev, the theoretical and practical parts of the methodology and technology of architectural monuments monitoring were worked out.