lidar improves railroad maintenance and...
TRANSCRIPT
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www.terrasolid.com
LiDAR improves railroad maintenanceand safety
Kjell Tuominen 16.10 2018
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• 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
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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]
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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
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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
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Mobile laser scanning
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
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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 GCPswas used in this pilot. The control points were signalized but unfortunately not correctly => check placement and color contrast
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Laser data processing
Unclassified laser data
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Laser data processing
The ground, wires, poles and the danger trees classified
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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
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Laser data processing
The danger tree trunks are drawn on their own level
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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
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Laser data processing
Danger trees that would reach the structure gauge
Danger trees that would reach the railroad tracks
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Laser data processing
Danger trees that would reach the wires or the cables
Classified sight obstacles
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Laser data processing
Missing track ballast can be computedfrom the laser data
Vectorized control cabinet
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Laser data processing
Level crossing
Longitudinal section of the crossing road
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Laser data processing
Automatically vectorized wires
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Laser data processing
Automatically vectorized rails
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Browser-based tool
Danger trees and the legal property boundaries in the browser application, http://sova3d.fi
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Browser-based tool
Danger trees, buildings and the legal property boundaries in the browser applicationhttp://sova3d.fi
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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
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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
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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
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TerrasolidKanavaranta 7 B00160 Helsinki Finlandwww.terrasolid.com
© TERRASOLID LTD
Senior Technical [email protected]
Kjell Tuominen