Parcellevel Measure of Public Transit Accessibility to Destinations

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Parcellevel Measure of Public Transit Accessibility to Destinations

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Multi-modal, walking. Measurement Approaches. Access to & from. public transit network ... (C1) Identify all accessible parcels (within 1,000m) (D) Choose min. ... – PowerPoint PPT presentation

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Title: Parcellevel Measure of Public Transit Accessibility to Destinations

1
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

2
Outline

Problem
Current solutions
Proposed method
Test case
Final words

3
Public Transit Accessibility

Fundamentally differentmode of urban transport
Complex spatial temporal components
Multi-modal,walking

4
Measurement Approaches

Access to frompublic transit network
Spatial focus
Zonal aggregation (e.g., TAZ)

5
Implications

Exaggerate benefits
Incomplete picture
Estimations forecastsevaluations policies

6
Current Techniques

1. Stop Station Catchment

Area buffers(400m radius)Area ratios

Network buffersBedroom ratios(Zhao et al.,
2003)

7
Current Techniques, cont.

2. Accessibility to Destinations
Most gravity-based
Zonal approach
Broad categoriesof destinations

8
Conceptual Framework

Classification of land uses
Total travel time
Single type of destination orCombination of
different types
E.g., accessibility togrocery stores

9
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
10
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

11
Area Ratio Method
12
Simplifed Parcel Method(res. only)
13
Proposed Parcel Method(res. only)
45 min
14
Area Ratio
Simplified Parcel
Proposed Parcel
15
(No Transcript)
16
Limitations