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Topcon gpt 3007n registration#
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The analyses of the shape and verticality are usually conducted on processed data, i.e. The use of laser scanning technology for chimney geometry analysis has been widely discussed in the literature of the subject. The advantages of the scanning technology are less obvious in view of the conditions and properties of prismless distance measurements and in particular the issue of precise orientation of the point clouds.

Topcon gpt 3007n free#

The laser scanning technology is free of such limitations. However, it is only efficient for small portions of the chimney shell.

This method is accurate and, depending on the number of stations, makes it possible to assess the deformation of the structure. The verticality of the industrial chimney axis is usually analysed by measuring the directions of the tangents to the circular sections of the structure. The method is discussed on a practical example of scanning of an industrial chimney in order to examine its condition and geometry. This publication presents the analysis and solution of this problem through the use of virtual reference points. As a result, it makes it impossible to create a proper 3D model with the assumed internal accuracy. Most often available only from the ground level, without the possibility of implementing targets at the top as well as identification of structural elements that can replace them. Tall structures are a special case of constructions in the aspect of registering scans and determining their spatial location.

Topcon gpt 3007n registration#

As a consequence, we face the problem of proper registration of individual scanning images, which has been widely discussed in many publications. Making uniform and precise 3D models for large and complex building structures always involves the necessity of acquiring adjacent scans from multiple locations. This contributes to the ability to perform advanced analyses (determination of cross-sections, geometry, volume or displacements and deformations over time) as well as to obtain the desired information on the properties or state of an object at any point, not just at selected spots.

Topcon gpt 3007n full#

All these contribute to the fact that the TLS technique is now applied in as built surveys of buildings and structures for the purpose of documentation of their existing condition and checking compliance with the project creating the precise 3D models of structures of various types for design purposes documenting historical objects or destruction, deformation, and monitoring of engineering constructions and excavations surveying of tunnels and rail tracks calculating volumes applying building information modeling (BIM) monitoring the stability of the earth’s structures and geotechnical and geological mapping in mining.įrom the engineering surveying perspective, one of the most interesting features of this technology is the possibility of obtaining a full model of the surveyed structure. Among its advantages, one should definitely point out the ease and speed of use (up to 1 million points per second) precision (up to mm level accuracy) with a high point density, non-invasive, and remote character of the measurement (also in very low light conditions) and the possibility of remote operation (especially important in life-threatening or health-endangering conditions). The evolution of scanning technology (TLS), we have seen in recent years, has made this method not only more and more eagerly used in broad-based engineering, but in many applications has given it a leading role. The concept of virtual reference points was verified by the measurement of the verticality of the axis and the structural geometry of a steel industrial chimney, which was accessible only on the foundation level.

Both procedures are preceded by the filtration of outliers. In the solution presented herein, the coordinates of the reference points were independently determined twice: in the geodetic coordinate system using traditional method, in the local system of the scanner using the bisector of the chord of the circle, and by approximation of the circular arc shape of the chimney shell. In the case of an industrial chimney, these can be the structural axis points determined at arbitrarily selected altitudes. The virtual reference points are not marked, but their position can be re-created in the post-processing of the scans on the basis of the geometrical features of the object. If it is not possible to place the required number of reference points in the observation scene, and there are no identifiable structural elements that could serve as such reference points, the issue can be solved by using the virtual reference points.

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The concept of obtaining uniform and high-precision 3D models of large and complex engineering structures based on terrestrial laser scanning surveys highly depends on the accuracy of registering a series of adjacent scans.