Example of historic building inventory with an application of UAV photogrammetry

Abstract

The purpose of this work was to develop data from photogrammetric flight using an UAV with a non-metric camera. Due to the specific subject of the present study, it was necessary to review the software available on the market, one that would provide the opportunity to model specific objects such as architectural structures, with satisfactory results. As a result, a 3D model of the eastern façade of the church of Saint Charles Borromeo in Wrocław was obtained. The use of UAVs for this type of measurement is an innovative method that allows quick, secure and relatively cheap data acquisition. The article presents subsequent steps in the development of non-metric photogrammetric data. The model obtained from photographs taken by the UAV was subjected to accuracy analysis using a tachymetric measurement fitted into this model. Equipping the model with georeferencing consisted in determining coordinates of characteristic points, thanks to which it was placed in the local coordinate system.

Analysis of Two-Option Integration of Unmanned Aerial Vehicle and Terrestrial Laser Scanning Data for Historical Architecture Inventory

“…Many cartometric products are now created using photogrammetric methods and images acquired from aircraft or UAVs (Cienciała, 2018;Gradka et al, 2019;Gbopa et al, 2021). Aerial images have a great potential for information, and the possibility of obtaining information in areas difficult to access remotely supports their increasing use (Mikrut et al, 2013;Karabin et al, 2021).…”

“…The entire surface of the object when texturing with the "adaptive orthophoto" option, is divided into a series of horizontal and vertical segments, which allows for an accurate representation of the texture and colour of the object. The occurrence of errors at this stage can only be caused by incorrect mesh generation (Gradka et al, 2019). Texturing of the 3D model in its lower parts and places difficult to see from the upper level (e.g., under the roof) was performed based on complementary images acquired with a drone at low level, holding the drone in the hand, and treating it with a terrestrial camera.…”

“…Current 3D reconstruction techniques using a digital image, according to (Escarcena et al, 2011;Xu et al, 2014), are considered to be cost-effective and efficient methods for producing high-quality digital 3D models. Together with the development of image matching techniques and algorithms, the modelling results are becoming more precise (Gradka et al, 2019). For spatially complex objects, they require digital images with high forward and side overlap.…”