lidar improves railroad maintenance and...

www.terrasolid.com

LiDAR improves railroad maintenanceand safety

Kjell Tuominen 16.10 2018

• The danger objects and visibility, risk tree and level crossing visibility information, are not known or incomplete

Current maintenance and safety problems

• The maintenance tenders are based on incomplete information

• At the beginning of the assignment, initial data are scattered across different systemsand tables

• The accuracy of the data is not sufficient and up to date

• As a result of these issues the contractor quite often demands compensations which isdifficult to solve in a way which would satisfy all parties involved

• Difficult to do a follow-up since there is no reference data or it is inaccurate

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 (www.destia.fi) which in turn turned to:

Geotrim Oy, laser scanning, https://www.geotrim.fi•

• Terrasolid Ltd, laser data processing and development, http://www.terrasolid.com

• Sova 3D, browser-based tools and development, http://sova3d.fi

This presentation focuses on Terrasolid solutions and if you would like to know

more about the pilot, turn to the project manager [email protected]

mailto:[email protected]

Tuomioja-Raahe railroad pilot project, 34km

• Pilot project = A small scale implementationof 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 processand safety analysis

The focus was on improving the tender material and utilizing the models for track maintenance

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


The laser scanning was performed at a speed of 30-40 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


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 GCPswas used in this pilot. The control points were signalized but unfortunately not correctly => check placement and color contrast

Laser data processing

Unclassified laser data


The ground, wires, poles and the danger trees classified


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


The danger tree trunks are drawn on their own level


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


Danger trees that would reach the structure gauge

Danger trees that would reach the railroad tracks


Danger trees that would reach the wires or the cables

Classified sight obstacles


Missing track ballast can be computedfrom the laser data

Vectorized control cabinet


Level crossing

Longitudinal section of the crossing road


Automatically vectorized wires


Automatically vectorized rails

Browser-based tool

Danger trees and the legal property boundaries in the browser application, http://sova3d.fi

Browser-based tool

Danger trees, buildings and the legal property boundaries in the browser applicationhttp://sova3d.fi

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 mappingtechniques 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

Does LiDAR improve the railroad maintenanceand safety?

YES

With the right processing, designing and visualisation tools mobile mapping will

improve both the maintenance and the safety of railways

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:

https://www.terrasolid.com/ssl/download_software.php

•

• You may try Terrasolid software free of charge for a limited period of time.

Contact Terrasolid sales and marketing persons:

http://www.terrasolid.com/contact.php

http://www.terrasolid.com/contact.php

TerrasolidKanavaranta 7 B00160 Helsinki Finlandwww.terrasolid.com

© TERRASOLID LTD

Senior Technical [email protected]

Kjell Tuominen

lidar improves railroad maintenance and...

Documents