Zhaosen Wang

The study of metro infill-stations in Los Angeles
Zhaosen Wang
(A visiting affiliate of CAUPD)

Planning Issues
• Does the existing rail stations consistent with the distribution of high transit-dependent residents?
• Where are the best locations for infill stations to serve existing residents?
• How walkable are the existing and proposed stations?
Layout disruption


The area of this study is within the LA County. The objects of analysis are 5 Metro rail lines and their 70 existing stations.


This layout illustrates the distribution of the percent of no-vehicle families in Los Angeles (raster layer).


This layout illustrates the distribution of the percent of public transit use in Los Angeles (raster layer).


This layout illustrates the distribution of the median income in Los Angeles (raster layer).


This layout illustrates the analysis result of proximity to Metro Stations in Los Angeles (raster layer).


This layout illustrates the analysis result of high transit need along existing Metro Rails in Los Angeles (raster layer).


This layout illustrates the spatial relationship between Metro station buffers and high transit need along existing Metro Rails in Los Angeles.


This layout illustrates the location of the proposed infill-station based on high transit need in Los Angeles.


This layout illustrates the service areas of different walking-radius around Metro stations.


This layout illustrates the comparison of area scale between buffers and service areas with the same radius.


This layout illustrates the various scales of service areas with the same walking-radius based on satellite image.


This image illustrates the various sizes of 0.5 mile service areas around the 70 existing stations.


This layout illustrates the relationship between the road-density and the scale of the service area.


That’s the model being used to convert vector based shape-files to raster files.


That’s the metadata being created for the proposed infill station layer.
The formulation
Transit dependent index = % No-vehicle families + % Transit use + Median Income + distance from stations
Findings:
• Most Metro rail stations are consistent with the distribution of high transit-dependent residents.
• The service area is smaller in areas with lower road-density.
Recommendations:
• New infill stations should locate in areas with high transit needs along the existing rail line.
• The locations of new infill stations should not overlapping existing service areas.
• The road-density should be planned higher around rail stations.
Skill used
1. Inset Map
Included in Layout 1 & 11
2. Geoprocessing
Merged Metro stations Red Line, Green Line, Purple Line, Blue Line and Gold Line stations (Layout 1)
3. Modeling
Converted the vector-based shapfiles to raster files to be used in Spatial Analysis (Layout 2, 3, 4, 14)
4. Proximity analysis
Proximity analysis to Rail Stations (Layout 5)
5. Hotspot Analysis
Analysis of high transit need used to determine appropriate locations for infill stations (Layout 6)
6. Buffering
1/2, 4/5, 1 mile buffers (Layout 7, 10)
7. Original Data
Created a point layer for the proposed infill station (Layout 8 ) 8)
8. Geocoding
Geocoded the new layer for the infill station (Layout 9)
9. Images
Satellite images (Layout 11)
10. Chart
Service Area Chart (Layout 12)
11. Network Analyst
Created walking service areas around existing and proposed rail stations (Layout 9)
12. Metadata
Created metadata for the proposed infill station layer (Layout 15)
Data Sources
• U.S. Census Bureau:
http://www.census.gov/
http://factfinder2.census.gov/
• Metro developer:
http://developer.metro.net/
• Esri:
http://www.esri.com/index.html