Multi-Variant TLS and SfM Photogrammetric Measurements Affected by Different Factors for Determining the Surface Shape of a Thin-Walled Dome

Abstract

The paper presents a combined analysis of terrestrial laser scanning (TLS) and structure from motion (SfM) photogrammetric measurement to determine an accurate model of the surface shape of a thin-walled dome. The analysis takes into account several factors that may affect the accuracy of measurement. In TLS measurements, these are related to scattering of the beam and its penetration into the structure of objects. Penetration of the beam into a synthetic structure changes the measured length. Shell moisture, caused by rainfall or dew effect, similarly affects the measured length, but the changes are dispersed. In the first case, it will change the size of the object, and in the second one, it generates measurement noise. SfM photogrammetric problems, such as object gloss and ambient reflection, lack of detail, and different results from software creating point clouds were also analyzed. An interesting observation was the significant influence of atmospheric pollution, sedimented on the lower half of the glossy dome, on increasing the accuracy of photogrammetric measurement. The analyses contain a number of cases that take into account the complex problems of obtaining and processing data of such facilities: periodic measurement, TLS and SfM photogrammetric measurement, measurement outside and inside the object, determination of the wall thickness, comparison with the project and free-sphere fitting, and use of dome rotation during TLS.

Evaluation of Tunnel Contour Quality Index on the Basis of Terrestrial Laser Scanning Data

“…This gives 35 measuring points evenly distributed on the planned contour profile. Taking into account the formulas (2)(3)(4)6) and on the basis of the six previously prepared sections, the parameters of the overbreak depth (O d ) and the contour roughness (RCL) were calculated for the side 1, side 2, the roof, and, finally, the entire blasting round. The obtained results are summarized in Table 2.…”

“…Terrestrial laser scanning (TLS) technology is currently gaining increasing interest [3]. It is successfully used for control and diagnostic measurements of various building structures [4][5][6]. The advantage of this technology is a possibility of contactless acquisition of a large amount of information about a given object, i.e., point clouds, in a relatively short time.…”

3D Indoor Crime Scene Reconstruction from Micro UAV Photogrammetry Technique

“…These differences may arise due to noise within the 3D model point cloud or due to the reflective properties of the cabin's material. It has been suggested by other researchers that the reflective surface can potentially interfere with the accuracy of optical imaging readings, including shiny, mirror-like surfaces and very dark materials [20][21][22][23][24]. Based on the above discussion, the quality of the resulting 3D model point cloud visualisation can be summarised in Table II.…”

Study of the Precise Determination of Pipeline Geometries Using UAV Scanning Compared to Terrestrial Scanning, Aerial Scanning and UAV Photogrammetry

“…For example, [36] demonstrates that a polarising filter can effectively reduce reflections when measuring small-scale structures. However, in [37], despite the use of a polarising filter, the measure-ment of the shiny part of the observatory's dome was not as accurate as its matte part. An appropriate approach in many research problems is to integrate UAV photogrammetric and terrestrial scanning data.…”