Alleys
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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


Alleys

in


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)


Metadata

Metadata


Raster and reclassify models

Raster and Reclassify Models


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