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Washington Metropolitan Area Transit Authority Minhua Wang GIS Enterprise Architect GIS in Transit Conference 2013 October 16-17, 2013.

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Presentation on theme: "Washington Metropolitan Area Transit Authority Minhua Wang GIS Enterprise Architect GIS in Transit Conference 2013 October 16-17, 2013."— Presentation transcript:

1 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

2 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

3 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?

4 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

5 Linear Referencing System Concept Incident Happened at this location (chain marker 283+00) Emergency Exit at Track 2 282+60 Emergency Exit at Track 1 282+60 Bridge from 277+90 to 281+75 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 Track 2 Track 1

6 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

7 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.)

8 WMATA Rail Line Asset Viewer Interface GIS-Based Rail Line Asset Viewer

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10 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

11 GIS-Based Rail Line Asset Viewer

12 GIS-BASED RAIL LINE ASSET VIEWER Select chain marker range to show track segments and asset locations

13 GIS-BASED RAIL LINE ASSET VIEWER Use Auto Rotate View to Align Map Orientation with Track Straight Line Diagram

14 GIS-BASED RAIL LINE ASSET VIEWER Toggle Basemap option to turn on aerial imagery

15 GIS-BASED RAIL LINE ASSET VIEWER Select an asset from the asset panel to view selected asset attributes and the location on the map

16 GIS-BASED RAIL LINE ASSET VIEWER Resize map view area

17 GIS-BASED RAIL LINE ASSET VIEWER Switch track using Track Select Tool from the map

18 GIS-BASED RAIL LINE ASSET VIEWER Track straight line diagram automatically changed from C line to B lince


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