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Kinematic Scanning    
ABA developing Kinematic 3D Scanning

The system known as the GRP5000 combines the HDS6000 and Leica GRP 100 rail trolley.The scanner is mounted on the trolley and fixed perpendicular to the track.

The beam rotates at 33 scans per second and records10,000 points per revolution. Integrated sensors for chainage, gauge, cant and time measurement:

• Chainage accuracy: 2cm
• Gauge measurement accuracy: 0.3mm
• Cant measurement accuracy: 0.1mm
• Time stamped every: 20mm
 
Graphical interface allows full measurement control

Density of measurement
- The speed at which the trolley is pushed along the track determines the density of the scan. 1km/hr represents a progression along the track of 8mm ensuring all detail is picked up.
- Chainage-specific profiles can be scanned by remaining stationary for just a few seconds.
The user specifies the reference stationing
The actual cross section measurement is shown in real time. This can be compared to a clearance profile.
A radio modem within the trolley allows operator to control tracking devices from the keyboard.		  
Coordinating scan data

Data is acquired as either:

Relative Measurements
• Profiles are measured relative to the track positions
• Given the true position of the track the real world coordinates of data can be calculated during post processing

Absolute Measurements
•
Full survey of track axis with absolute 3D coordinates in real time
•
The actual position of the trolley is tracked with total stations using automatic target tracking or GPS and transferred via the radio modem to the laptop
•
Simultaneously all the sensor values are measured and all the information is stored. The computed track position is calculated and displayed in real time
Processing

Massive amounts of storage capacity are required. At 1.5 MB of data recorded in one second approximately 500 MB of raw data per 100m is stored.

Software allows the scan to be viewed with a deroled projection at almost photo resolution and profiles can be extracted at any chainage. 		 
Cross Section

3d measured data can be easily viewed in psuedo-photographic form. Every detail appearing in the scan is measured to millimetre accuracy.		  

Cable Detail


Could you survey these cables in less than one minute?
Once we have the scan data we can take off the position of any part of the infrastructure within millimetres and in the controlled environment of the office. Viewing the scanned dataset is as easy as viewing the 3d world and validating the data takeoff is just as easy. We now find that missed detail or re-visits to site are relics of a past era if we have scanned the site.

 
3D View of St. James’s Park Station


Continuous kinematic scanning builds into a dimensionally accurate virtual world.		  
Clash detection

A clearance map can be overlayed on the projection to highlight clashes.		  
Data extraction

Spatial information from any point with in the scan area can be directly extracted from the data base. Extracted data can be presented as a full 3D wire frame or 2D profiles in any format required by the client. (AutoCAD, MOSS, ClearRoute, ASCII). Minimum or Maximum Profiles over a given chainage. The greyscale images and clash detection reports can be directly annotated and delivered in a number of packages.
Why Kinematic Scanning?

Productivity Track Survey at 1km per hour
Accuracy Accuracy comparable with other survey methods
Density No detail is left out, everything is measured, including adjacent rail
Access The portable and light weight design allows easy access
Clash Detection Given an envelope clash detection can viewed in real time and later presented visually
Multidiscipline Extra information can be extracted at any time for different professionals
Asset Management High resolution image provides a permanent record of all track side infrastructure
Flexible outputs Spatial information can be tailored to client's need
 

Case Study - ABA brings 21st Century technology to London’s Underground

Faced with a decision to introduce new trains by the year 2009 MetroNet decided on leading edge technology to provide the survey data needed to begin the rolling stock design. Read how ABA made this possible...

Click here to download our London Underground case study PDF and read how we achieved this.

 

  

Video - See how it's done...

Watch how the continuously moving Leica GRP5000 rail trolley and high-speed scanner captures all visable detail within a band of 30m either side of the track.

Capable of working at 4km per hour the system usually operates at 1km per where the density of the scan approaches photography resolution making detail identification and interpretation a simple process even in the darkness of tunnels or at night.

Survey detail is then extracted from the dataset and presented to the client in the form of a 3D wire-frame model.

Click here to view full-sized video (high bandwidth recommended)

If you can't view the video above, please download Flashplayer here.

 

    

Case Study and Video - When does 4 foot become 5 foot 3?


The railway line between Dublin in the east and Cork in the south west connects two of Ireland’s main cities. The line covers some 279 kilometres in a predominantly twin-track configuration and passes through some of the country’s most beautiful scenery. For further details Click here and download our case study PDF and watch our fly through video of part of the 3D dataset using the link below.

Click here to view full-sized video (high bandwidth recommended)

If you can't view the video above, please download Flashplayer here.

 

  
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