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Alleys. The Potential of Alleys as Public Space. Michelle Go UP 206A Final 12.6.10. Policy Question. Alleys may be a valuable resource in land-scarce and park-poor communities in Los Angeles. In which city council districts might alleys best compensate for a lack of open space?.

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alleys

Alleys

The Potential of Alleys as Public Space

Michelle Go

UP 206A Final

12.6.10

policy question
Policy Question
  • Alleys may be a valuable resource in land-scarce and park-poor communities in Los Angeles.
  • In which city council districts might alleys best compensate for a lack of open space?
alley methodology
Alley Methodology
  • Created a 7.5 ft left and right buffer and joined files to create 15 ft wide alleys
skills
Skills
  • Layout 1: Alleys in the City of Los Angeles &

Layout 2: Parks in the City of Los Angeles

    • Inset map
    • Attribute sub-set selection –
      • Alleys derived by querying LA streets file for Name = ‘Alley’ and exporting data to new layer
      • City of LA derived by querying LA County Populated Place Areas for Name = ‘Los Angeles’ and exporting data to new layer
    • Geoprocessing: Clip – Clip Alleys by LA City
    • Measurement / Analysis of alley miles and sq. mi. and parks sq. mi.
    • Image
  • Layout 3: Neighborhoods in Focus
    • 8 layers
    • Geocoding two home addresses
    • Buffer around homes
    • Images
skills1
Skills
  • Layout 4: Population Density in City Councils
    • Spatially joined zip code file with city council
    • Aggregated attribute fields
      • Council Population = Council Sq Mi / Sum_ZipCodeSqMi * Sum_ZipCodePop
      • Population density = Council population / Council Sq Mi
    • Index of population density
  • Layout 5: Areas Accessible to Alleys and Parks
    • Buffer , Aggregating attribute fields, Measurement / Analysis
      • Created 7.5 ft buffers to left and right of alleys. Used Calculate Geometry to calculate area of buffers. Calculated total alley area by adding left and right buffer areas.
      • Created ½ mi buffer around alleys and parks
    • Clip – clipped park buffer to LA City
skills2
Skills
  • Layout 6: Percent of District Area that is Alleys and Parks
    • Spatially joined Council with Alley layer, and Council with Parks layer
    • Calculated area of parks and area of alleys
    • Aggregated attribute fields:
      • PctPark = ParkSqMi / Council Sq Mi
      • PctAlley = AlleySqMi / Council Sq Mi
    • Index of PctPark and Pct Alley
  • Layout 7: Alleys and Parks per 1000 Residents
    • Spatially joined Council with Alley layer, and Council with Parks layer
    • Aggregate Attribute Fields
      • Alley Acre per 1000 residents = Sum Alley Acre / Council Population *1000
      • Park Acre per 1000 residents = Sum Park Acre / Council Population *1000
      • Index of Alley Acre per 1000 residents and Park Acre per 1000 residents
skills3
Skills
  • Layout 8: Which districts should improve their alleys?
    • Hotspot Analysis
    • Model – Raster and Reclassify models (shown in slide 17)
  • Additional skills
    • Metadata (shown in slide 16)