GIS-Based Rail Line Asset Viewer

Report
Washington Metropolitan Area Transit Authority
GIS-Based Rail Line Asset Viewer
Minhua Wang
GIS Enterprise Architect
[email protected]
GIS in Transit Conference 2013
October 16-17, 2013
GIS-Based Rail Line Asset Viewer
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Issues to Visualize Rail Line Assets
Location Referencing for Rail Line Assets
Rail Line Linear Reference (LRS) Model
Challenges in Constructing WMATA Rail Line
LRS Model
• Design of GIS-Based Rail Line Asset Viewer
• Demo of GIS-Based Rail Line Asset Viewer
Visualizing Rail Line Assets
• Engineer's View
– Straight Line Diagram: Track Chart
– What track chart tells you: track line and chain marker
location
• GIS Map View
– Asset location with X/Y coordinates
– How do you get X/Y locations for assets in underground
tunnel?
• How to convert Track Chart location (onedimension) to X/Y location?
Location Referencing for Rail Line Assets
• Common Location Referencing Models
– X/Y Coordinates: e.g., GPS locations
– Address Locations
– Place Name or Landmark Locations
• Linear Referencing Model
– Definition: Location Referencing based on linear distance
• Distance along specific route (track) and from the defined starting
point
• Locating points and linear events along specific route (track)
– Key components
• LRS route: network segment with spatial coordinates and
measurements: e.g., track segment with chain markers
• LRS event: attribute tables with location reference data items: LRS
route identifier and measurements: incidents, assets along track
Linear Referencing System Concept
Emergency Exit at
Track 2 282+60
Bridge from 277+90 to 281+75
Track 2
Track 1
Platform from 275+78 to 281+75
Linear Events:
• Bridge: location from 27790 ft to 28175 ft on Track line A1 & A2
• Platform: location from 27578 ft to 28175 ft on Track line A1 & A2
Point Events:
• Emergency Exit: location at 28260 ft on Track A1 & A2
• Incident: location at 28300 ft on Track A1
Emergency Exit at
Track 1 282+60
Incident Happened
at this location
(chain marker
283+00)
Constructing WMATA Rail Line LRS Model
• Track geometry
– Challenge: Equation point for chain marker stationing
– Track Segment definition
• LRS Definition
– Define Begin and Ending Chain Marker Values for a track segment
– Dual Track LRS
• LRS Generation
– ArcGIS LRS generation tools
• Event Data Processing
– Standardize trackside event location data structure
• LRS Segment
• LRS Measures(single measure for point events, dual measures for linear events): chain
marker value
– Tool to process event data automatically
• Make LRS Events
– ArcGIS LRS Tools
Design of GIS-Based Rail Line Asset Viewer
• Three Viewing Panels
– Straight-line Diagram Panel
– Asset View Panel
– GIS Map Panel
• LRS Search
• Align Location Reference (from 1-D straightline
diagram to 2-D map)
• Visualizing Asset Locations and Attributes
• Integration with Other Applications based on LRS
(e.g., Track Geometry, Workorder Management, Train
Positions, etc.)
GIS-Based Rail Line Asset Viewer
WMATA Rail Line Asset Viewer Interface
GIS-Based Rail Line Asset Viewer
Conclusion
• Linear Referencing System (LRS) model is a preferred location
referencing model for locating assets and incidents along Metro
track network
• Due to the complexity of Metro track network stationing (chain
makers), a custom-built LRS model has been developed for Metro
track network
• Based on the LRS model, a custom-built Asset Viewer application
has been developed to visualize assets (both point and linear
assets and incidents) along the track network
• This Asset Viewer application provides a means to transfer onedimension location referencing (Track Chart based) to twodimension location referencing (GIS map based) hence enabling
other GIS functions such as routing for locating assets and events
along the track network and navigating to the locations
GIS-Based Rail Line Asset Viewer
GIS-BASED RAIL LINE ASSET VIEWER
Select chain marker range to show track segments and asset locations
GIS-BASED RAIL LINE ASSET VIEWER
Use Auto Rotate View to Align Map Orientation with Track Straight Line Diagram
GIS-BASED RAIL LINE ASSET VIEWER
Toggle Basemap option to turn on aerial imagery
GIS-BASED RAIL LINE ASSET VIEWER
Select an asset from the asset panel to view selected asset attributes and the location on the map
GIS-BASED RAIL LINE ASSET VIEWER
Resize map view area
GIS-BASED RAIL LINE ASSET VIEWER
Switch track using Track Select Tool from the map
GIS-BASED RAIL LINE ASSET VIEWER
Track straight line diagram automatically changed from C line to B lince

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