Parcel level measure of public transit accessibility to destinations
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Parcel-level Measure of Public Transit Accessibility to Destinations. Brian H. Y. Lee Urban Design & Planning University of Washington 19 Nov 2004 TransNow Student Conference Portland State University. Outline. Problem Current solutions Proposed method Test case Final words.

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Parcel level measure of public transit accessibility to destinations

Parcel-level Measure ofPublic Transit Accessibilityto Destinations

Brian H. Y. Lee

Urban Design & Planning

University of Washington

19 Nov 2004

TransNow Student Conference

Portland State University


Outline
Outline

  • Problem

  • Current solutions

  • Proposed method

  • Test case

  • Final words


Public transit accessibility
Public Transit Accessibility

  • Fundamentally differentmode of urban transport

  • Complex spatial &temporal components

  • Multi-modal,walking


Measurement approaches
Measurement Approaches

  • Access to & frompublic transit network

  • Spatial focus

  • Zonal aggregation (e.g., TAZ)


Implications
Implications

  • Exaggerate benefits

  • Incomplete picture

  • Estimations & forecastsevaluations & policies


Current techniques
Current Techniques

  • Area buffers(400m radius)Area ratios

1. Stop & Station Catchment:

  • Network buffersBedroom ratios(Zhao et al., 2003)


Current techniques cont
Current Techniques, cont.

2. Accessibility to Destinations:

  • Most gravity-based

  • Zonal approach

  • Broad categoriesof destinations


Conceptual framework
Conceptual Framework

  • Classification of land uses

  • Total travel time

  • Single type of destination orCombination of different types

  • E.g., accessibility togrocery stores


Measurement process
Measurement process

(A) Identify destinations

Transit

Walk

(B1) Identify all stops (within 400m)

(C1) Identify all accessible parcels (within 1,000m)

(B2) Calc. walk time from each stop

(B3) Calc. travel time from upstream stops

(B4) Calc. avg. wait time at each stop(1/2 headway)

(B5) Identify all accessible parcels(within 400m)

(B6) Calc. walk access time from parcels

(C2) Calc. walk access time

(B7) Sum total travel time

(D) Choose min. travel time

(E) Associate other data


Test case application
Test Case Application

  • King County Metro - Buses

  • One grocery store location

  • Accessibility measurement & population estimate

  • Area buffer & ratio: “Area ratio”

  • Parcel-level – spatial: “Simplified parcel”

  • Parcel-level – spatial & temporal: “Proposed parcel”




Proposed parcel method res only
Proposed Parcel Method(res. only)

} 45+ min


Area ratio

Simplified Parcel

Proposed Parcel

Area Ratio


Limitations
Limitations

  • Land use classifications

  • Estimation of waiting times

  • Monetary costs

  • Other transit service characteristics


Conclusions recommendations
Conclusions & Recommendations

  • Informative graphical results

  • Realistic (conservative) estimates

  • Potentials for modeling applications

  • Streamline data management & processing



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