Justification of the provisions of the methodology for performing ground photogrammetric survey of unfinished construction projects

This article presents the results of a study that substantiates the provisions of a methodology for conducting terrestrial photogrammetric surveys of unfinished construction objects using a dual-camera system. The relevance of this work stems from the necessity of obtaining reliable information about the actual condition of structural elements at unfinished construction sites, which is important for making decisions regarding necessary actions for restoration, demolition, or conservation of the object. For the study, a terrestrial photogrammetric survey was carried out using a dual-camera photogrammetric system on an unfinished construction object. The variable parameters considered in performing and processing the photogrammetric survey were shooting frequency, method of image alignment, and the application of an optimization procedure. The results obtained showed that to ensure successful image alignment, it is necessary to consider the minimum required shooting distance between frames and to apply an optimization procedure based on the accurate coordinates of the centers of reference images. The use of general pre-selection during image alignment allows for the best results in terms of the final model’s accuracy. The conclusions drawn enable the formulation of the main provisions of a methodology for conducting terrestrial photogrammetric surveys of unfinished construction objects using a dual-camera system, ensuring the acquisition of three-dimensional models for subsequent analysis of the technical condition of structural elements.