Calculation of Planned Elements of a Clothoid Route Composed on the Terrain Stereomodel

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UDС

634.0.383

DOI:

10.17238/issn0536-1036.2018.4.97

Abstract

Comparison of the existing methods of route laying shows that the way of tracing according to a stereomodel, when the route is laid in the form of a spatial curve, taking into account all visible terrain conditions, is the most advantageous. However, the advantages of such a tracing were not always used in practice because of the complexity of the photogrammetric definitions when working with aerophotos. This significantly reduced the effectiveness of the use of aero photomethods when investigations of linear type. The emergence of high-speed computers predetermined the direction of further improvement of aero research: the creation of operation schedule of routing that maximized the use of photogrammetry and modern computer technology. The paper presents a semi-automated operation schedule for determining the design elements of the route, which greatly simplifies the process of photogrammetric laying of the route according to a stereomodel and fully automates all calculations. Simplification of photogrammetric laying is achieved due to an approximate finding of a projected route position in a number of points, as well as an approximate determination of the curvature elements by means of templates using the stereomodel. A strict determination of the position of a future route with coordination and adjustment, selected according to the stereomodel of elements, is performed on the computer simul-taneously with photogrammetric processing. When tracing according to a stereomodel of the terrain, the use of pattern of curves does not provide an accurate definition of the elements of curves corresponding to the final stages of the forest road design. Increasing the accuracy can be achieved by applying a more accurate method of determining the coordinates of terrain points and strict analytical dependencies existing in the clothoid curvature. The described process of tracing according to aerial photographs is performed on the simple photometric instruments: a stereoscope and a stereocomparator. Since the observation of images under the stereoscope does not require any special orientation, its use to select the position of the route simplifies and speeds up this process; and the use of an automated stereocomparator significantly reduces the time required for preparing the initial information for the computer.

Authors

M.M. Umarov¹, Candidate of Engineering Sciences
A.V. Skrypnikov², Doctor of Engineering Sciences, Professor
D.V. Lomakin², External Student
E.Yu. Mikova², External Student

Affiliation

¹Bauman Moscou State Technical University, ul. Baumanskaya 2-ay, 5/1, Moscou, 105005, Russian Federation; e-mail: m_m_umarov@mail.ru
²Voronezh State University of Engineering Technology, pr. Revolyutsii, 19, Voronezh, 394036, Russian Federation; e-mail: skrypnikovvsafe@mail.ru, elenabok@mail.ru, e_y_mikova@mail.ru

Keywords

forest lorry road, tracing, stereomodel, clothoid, stereoscope, stereocomparator

For citation

Umarov M.M., Skrypnikov A.V., Lomakin D.V., Mikova E.Yu. Calculation of Planned Elements of a Clothoid Route Composed on the Terrain Stereomodel. Lesnoy zhurnal [Forestry journal], 2018, no. 4, pp. 97–106. DOI: 10.17238/issn0536-1036.2018.4.97

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Received on March 07, 2018