GIS-Based Rail Line Asset Viewer 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 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 (one-dimension) 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 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 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 Demo

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

GIS-Based Rail Line Asset Viewer Questions? Thank You!

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