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Washington Metropolitan Area Transit Authority. Minhua Wang GIS Enterprise Architect mwang@wmata.com GIS in Transit Conference 2013 October 16-17, 2013. GIS-Based Rail Line Asset Viewer. GIS-Based Rail Line Asset Viewer. Issues to Visualize Rail Line Assets

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slide1

Washington Metropolitan Area Transit Authority

Minhua Wang

GIS Enterprise Architect

mwang@wmata.com

GIS in Transit Conference 2013

October 16-17, 2013

GIS-Based Rail Line Asset Viewer

gis based rail line asset viewer
GIS-Based Rail Line Asset Viewer
  • 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
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 (one-dimension) to X/Y location?
location referencing for rail line assets
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
slide5

Linear Referencing System Concept

Emergency Exit at Track 2 282+60

Bridge from 277+90 to 281+75

Track 2

Track 1

Incident Happened at this location (chain marker 283+00)

Platform from 275+78 to 281+75

Emergency Exit at Track 1 282+60

  • 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
constructing wmata rail line lrs model
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
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.)
slide8

GIS-Based Rail Line Asset Viewer

WMATA Rail Line Asset Viewer Interface

conclusion
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 one-dimension location referencing (Track Chart based) to two-dimension 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
slide12

GIS-BASED RAIL LINE ASSET VIEWER

Select chain marker range to show track segments and asset locations

slide13

GIS-BASED RAIL LINE ASSET VIEWER

Use Auto Rotate View to Align Map Orientation with Track Straight Line Diagram

slide14

GIS-BASED RAIL LINE ASSET VIEWER

Toggle Basemap option to turn on aerial imagery

slide15

GIS-BASED RAIL LINE ASSET VIEWER

Select an asset from the asset panel to view selected asset attributes and the location on the map

slide17

GIS-BASED RAIL LINE ASSET VIEWER

Switch track using Track Select Tool from the map

slide18

GIS-BASED RAIL LINE ASSET VIEWER

Track straight line diagram automatically changed from C line to B lince