3-D modelling and visualization of large building using photogrammetric approach

Abstract

The progress in modern technologies such as precise lightweight cameras mounted on unmanned aerial vehicles (UAV) and the more user-friendly software in the photogrammetric field, allows for 3-D model construction of any structure or shape. Software now achieves in sequence the processes of matching, generating tie points, block bundle adjustment, and generating digital elevation models.The aim of this study is to make a virtual 3-D model of the college of engineering /University of Duhok. Kurdistan Region, Iraq. The data input is vertical and oblique imagery acquired by UAV, ground control points distributed on the surrounded ground, facades, and roof. Ground control points were measured by the GPS RTK system in addition to the reflectorless total station instrument. The data is processed mainly using Agisoft PhotoScan software as well as the Global Mapper and the ReCap software. The output is a 3-D model, digital elevation model, and orthomosaic.Geometric and visual inspections were carried out. Some imperfections appeared on the sharp edges and parapets of the building. In the geometric accuracy of selected points on the building, the maximum standard deviation in the coordinates was ±4cm. The relative accuracy in distance measurements were in the range of 0.72% to 4.92 %

Investigation of the UAV Capability for Measuring Building's Cracks Dimensions

“…Because of the absence of vertical coverage, model deformation is to be expected. When GCPs are added for the Geo-referencing process in AgisoftPhotoscan, the images on which points are chosen show all of the control points on the front and back sides (Kattan et al, 2022). Figure 17 the exact comment on the building model.…”

“…The purpose of this research is to explore building cracks using UAV imagery. Kattan et al (2022) studied geometric and visual inspections on a large building. The accurateness of the geometric of the selected points on the building, the maximum standard deviation in the coordinates was ±4cm.…”

Photogrammetric Modelling of Street Conditions Using A Vehicle-mounted Non-metric Camera

“…According to Kattan et al (2021), the Leica Viva GNSS, GS10 base receiver, and GS15 rover receiver were used to set 9 control points on the ground surrounding the building as positions to employ the Leica TCR1101 total station in a reflectless mode to measure about 92 points on the building's façade, while the rover GS15 receiver was used to measure 27 points on the building's roof surface. The GCPs were in WGS 84 / UTM zone 38N coordinate system.…”