LiDAR improves railroad maintenance and safety

Transcription

1 LiDAR improves railroad maintenance and safety Kjell Tuominen

2 Current maintenance and safety problems The maintenance tenders are based on incomplete information The accuracy of the data is not sufficient and up to date The danger objects and visibility, risk tree and level crossing visibility information, are not known or incomplete At the beginning of the assignment, initial data are scattered across different systems and tables Difficult to do a follow-up since there is no reference data or it is inaccurate As a result of these issues the contractor quite often demands compensations which is difficult to solve in a way which would satisfy all parties involved

3 How to solve these issues? Finnish Transport Agency decided to implement a pilot project FTA made an agreement with the Finnish infrastructure and construction service company Destia ( which in turn turned to: Geotrim Oy, laser scanning, Terrasolid Ltd, laser data processing and development, Sova 3D, browser-based tools and development, This presentation focuses on Terrasolid solutions and if you would like to know more about the pilot, turn to the project manager mika.jaakkola@destia.fi

4 Tuomioja-Raahe railroad pilot project, 34km Pilot project = A small scale implementation of a larger project used to work out issues and test new solutions to improve the project processes Solutions to test Mobile laser scanning Review and design with browser-based tools Usability of laser in the maintenance process and safety analysis The focus was on improving the tender material and utilizing the models for track maintenance

5 Mobile laser scanning The mobile mapping was done with a Trimble MX8 mapping system, mounted on a van which was mounted on an open train wagon

6 Mobile laser scanning The laser scanning was performed at a speed of km/h, back and forth. This enables comparison of the accuracy and optimizes the correction of the raw smoothed GPS solutions from two different observation queues

7 Mobile laser scanning The two drive paths were adjusted and as the point cloud was dense, points from one line was sufficient. The better one with a maximum elevation difference of 0,089 m to the GCPs was used in this pilot. The control points were signalized but unfortunately not correctly => check placement and color contrast

8 Laser data processing Unclassified laser data

9 Laser data processing The ground, wires, poles and the danger trees classified

10 Laser data processing Points belonging to the same danger tree was assigned a separate group number which enables the possibility to automatically extract a relatively accurate trunk vector

11 Laser data processing The danger tree trunks are drawn on their own level

12 Laser data processing If tree species are defined then it is possible to output a list with the species name, coordinates, height, crown width and even trunk width, provided that there is enough hits on the trunk

13 Laser data processing Danger trees that would reach the structure gauge Danger trees that would reach the railroad tracks

14 Laser data processing Danger trees that would reach the wires or the cables Classified sight obstacles

15 Laser data processing Missing track ballast can be computed from the laser data Vectorized control cabinet

16 Laser data processing Level crossing Longitudinal section of the crossing road

17 Laser data processing Automatically vectorized wires

18 Laser data processing Automatically vectorized rails

19 Browser-based tool Danger trees and the legal property boundaries in the browser application,

20 Browser-based tool Danger trees, buildings and the legal property boundaries in the browser application

21 Conclusions Mobile laser scanning produces a dense point cloud that provides comprehensive information on the visible targets of the railroad environment Mapping of danger trees has been a challenge for traditional mapping techniques but works well with Terrasolid tools Modelling of sight areas has not been possible without visiting the terrain and manually measure the sight obstacles but this can be done using laser data and Terrasolid tools The calculation of the missing ballast was tested and it showed that it is possible and can be done with Terrasolid tools

22 Does LiDAR improve the railroad maintenance and safety? YES With the right processing, designing and visualisation tools mobile mapping will improve both the maintenance and the safety of railways

23 Terrasolid software Terrasolid applications used in the pilot, TerraScan, TerraMatch, TerraModeler and TerraPhoto can be run in 64bit Bentley software, Microstation, Powerdraft or Map Powerview CONNECT editions and OpenRoads Designer. Tested version numbers: You may try Terrasolid software free of charge for a limited period of time. Contact Terrasolid sales and marketing persons:

24 Kjell Tuominen Senior Technical Consultant Terrasolid Kanavaranta 7 B Helsinki Finland TERRASOLID LTD