Abstract
Abstract. Measuring of railway structure clearances is a very practical issue, and the operation itself is performed all over the world using various measuring systems. The measurement is aimed chiefly at determining the limits of space that no structure (e.g. a building) located close to the railway track may cross. The paper demonstrates flaws and advantages of particular systems and provides a technological summary of measuring equipment utilized in them. In those systems the measurement of structures is referred to the global system of coordinates, and later, following the detection of rail heads, a transformation to the rail axis arrangement takes place. The preliminary analysis leads to a conclusion that the accuracy of rail clearance measurement is higher in the case of specialized systems as compared to universal ones. On the basis of experience drawn from literature and earlier tests, a decision has been made to proceed with the construction of a rail clearance measurement system in Poland, at the University of Science and Technology in Cracow. This paper presents a research on the prototype of the rail clearance measurement system constructed at the University. The heart of the system involves laser scanners installed on a flatcar and digital cameras. The base of the system includes scanners, which capture data in a continuous way, and photogrammetric cameras, which yield digital images. The cloud of points obtained from a laser scanning is colorized, which causes that such information can replace a classical texture model.
Highlights
Measuring of railway structure clearances is a practical issue, performed all over the world, using various measuring systems
On the basis of those research works, the authors have worked out International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B4, 2012 XXII ISPRS Congress, 25 August – 01 September 2012, Melbourne, Australia assumptions for a measuring system responding to the questions about selection and configuration of measuring equipment
Conclusions drawn from field measurements and development of a preliminary concept led to defining the measurement system prototype model
Summary
Measuring of railway structure clearances is a practical issue, performed all over the world, using various measuring systems. The authors of this paper are presently implementing a project, and one of its tasks is developing a prototype of such system. The main goal of the project includes research on a prototype of a system of rail clearance measurement and railway codification. The authors focus on the first part of the project, i.e. developing of a prototype of a measuring system. The authors have reviewed the existing systems (Section 1.2), and selected two solutions, which were examined, and for which test measurements described in Section 3 were performed. Based on experiments, which had been conducted, the authors proposed a prototype of measuring flatcar to be tested in subsequent stages of the project (Section 4)
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