Identifying and Measuring Urban Design Qualities Related to ...
Transcript of Identifying and Measuring Urban Design Qualities Related to ...
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Identifying and Measuring Urban Design Qualities Related to
Walkability
Funding by the Active Living Research program of The Robert Wood Johnson Foundation
Reid Ewing, Otto Clemente,
Susan Handy, Ross Brownson, and Emily Winston
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Growing Body of Evidence
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Mostly Gross Qualities
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Even Audit Instruments
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Not a Lot to Do with Experience of Walking Down a Street
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Genesis of Project
• Christopher Alexander, A Pattern Language -Towns Buildings Construction
• Richard Hedman, Fundamentals of UrbanDesign
• Allan Jacobs, Great Streets
• Kevin Lynch, The Image of the City
• Amos Rapoport, History and Precedent inEnvironmental Design
• William H. Whyte, City—Rediscovering theCenter
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Conceptual Framework
Physical features
-Sidewalk width-Street width-Traffic volumes-Tree canopy-Building height-Number of people-Weather-Etc.
Perceptual qualities
-Imageability-Legibility-Complexity-Coherence-Enclosure-Human scale-Linkage-Transparency
Individualreactions
-Sense of Safety-Sense of Comfort-Level of Interest
Overallwalking quality
Walking behavior
More objective More subjective
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Work Plan
• Expert Panel
• Literature Review with Definitions
• Library of Video Clips
• Visual Assessment Survey
• Quantitative and Qualitative Analyses
• Instrument Development, Testing, andTraining
• Illustrated Field Manual
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National Expert Panel
• Victor Dover - urban designer• Rob Lane - urban designer• Geoffrey Ferrell - urban designer/code expert• Tony Nelessen - urban designer• Anne Vernez Moudon - urban designer/planner• Mark Francis - landscape architect• Michael Southworth - urban designer• Michael Kwartler - architect/simulations expert• John Peponis - architect/space syntax expert• Dan Stokols - social ecologist
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Perceptual Qualities
• Imageability
• Enclosure
• Human Scale
• Transparency
• Linkage
• Complexity
• Coherence
• Legibility
41 qualities
8 qualities
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Textbook Definitions
Imageability is the quality of a place that makes it recognizable and memorable. A place has high imageability when specific physical elements and their arrangement evoke distinct images or positive feelings.
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Video Library
• Urban Streetscapes
• 22 Cities
• 205 Video Clips
• 86 Clips Rated by Research Team
• 48 Clips Rated by Panel
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Fractional Factorial Design
full factorial design =28 design = 256 clips
1/16 fractional design =28-4 design = 16 clips
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Best Match RunHigh Values of All Eight Qualities
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Best Match RunHigh Values of Imageability, Human
Scale, Linkage, and Tidiness
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Best Match RunHigh Values of Enclosure, Transparency,
Complexity, and Coherence
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Visual Assessment Survey Form
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Individual Ratings
Imag
eabi
lity
Encl
osur
e
Hum
an S
cale
Tran
spar
ency
Link
age
Com
plex
ity
Coh
eren
ce
Tidi
ness
Legi
bilit
y
Wal
king
Qua
lity
Peponis 4 4 5 3 3 4 4 2 4 4Southworth 5 5 5 4 4 3 4 3 5 5Lane 5 5 5 5 5 5 5 4 5 5Ferrell 5 4 5 4 4 4 5 4 5 4.8Nelessen 4 4 4 4 4 4 4 3 4 4Dover 5 4 5 5 5 5 4 5 5 5.0
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Regression Model for Overall Walkability
Standardized Coefficient
0.4200.1490.0590.1570.310
Variableconstanthuman scaletransparencytidinessenclosureimageabilityNR-squareAdjusted R-
square
Coefficient-0.2260.4110.1370.0700.1400.307
48.959
.954
t-statistic-1.5035.8142.3661.5982.5045.153
p-value0.1400.0000.0230.1170.0160.000
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Inter-rater Reliability Ratings of Urban Design
Qualities
imageabilitylegibilityenclosurehuman scaletransparencylinkagecomplexitycoherenceTidinessN
Cronbach’sAlpha.930.895.945.928.926.896.926.880.915
95% ConfidenceInterval of ICC
.385-.618
.276-.509
.478-.697
.399-.630
.390-.622
.169-.621
.398-.632
.271-.504
.314-.550
Intra-class Correlation Coefficient
.494
.380
.584
.508
.499
.344
.508
.374
.42148
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Content Analysis of Sampled Scenes
• 48 Clips
• More than 100 Physical Features
• Operational Definitions for AllFeature
• 1 Hour-plus per Clip
• Gold Standard
• Inter-rater Reliability Test
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Selection of Physical Features
• Logic/Common Sense
• Literature
• Interviews with Expert Panel
• Operational Definitions from ExpertPanel
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Operational Definitions
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Inter-rater Reliability Estimates of Physical Features
Variable ICC Alpha Variable ICC Alpha
number of courtyards etc.
.471 .611
proportion street wall –opposite side
.588 .737
arcades --- ---number of
enclosed sides
.389 .640
.878.763number of landmarks
average building setback –same side
.338.215
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Relate Urban Design Qualities Ratings to Physical
Features
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Cross-Classified Random Effects Model
• New Class of Model
• Only a Handful of Applications
• Hierarchical in Nature
• Partitions Variance
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Partitioning Total Variance
Viewer Measurement Scene Variance Variance Error Total Variance
imageability 0.67(50)
0.16(12)
0.50(38)
1.33
legibility 0.46(39)
0.17(14)
0.55(47)
1.18
enclosure 0.83(59)
0.10(7)
0.48(34)
1.41
human scale 0.68(53)
0.11(8)
0.50(39)
1.29
transparency 0.77(51)
0.13(8)
0.62(41)
1.52
linkage 0.51(34)
0.26(17)
0.74(39)
1.51
complexity 0.6(52)
0.09(8)
0.47(40)
1.16
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Cross-Classified Random Effects Models (fixed effects too)
actual score = predicted score + measurement error
predicted score = constant + viewer random effect + scene random effect + a*viewer variables + b*scene variables
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Best-Fit Transparency Model
Variable Coefficient t-statistic p-value
constant 1.709
proportion first floor 1.219 3.13 0.002with windows
proportion active uses 0.533 2.96 0.004
proportion street wall 0.666 2.57 0.011– same side
Proportion of Scene 0.62Variance Explained
Proportion of Total 0.32Variance Explained
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Performance of Urban Design Qualities
Tidiness 0.117 0.421 0.70/0.30 2 of 3 3 of 5
(1 missing)
Enclosure 0.016 0.584 0.72/0.43 5 of 5 5 of 5
Human scale 0.000 0.508 0.62/0.35 7 of 7 5 of 5
Transparency 0.023 0.499 0.62/0.32 3 of 3 5 of 5
Linkage --- 0.344 0.61/0.21 4 of 5 1 of 5
Complexity --- 0.508 0.73/0.38 5 of 6 3 of 5
Coherence --- 0.374 0.67/0.25 3 of 4 1 of 5
Legibility --- 0.380 0.54/0.21 5 of 5 1 of 5
(1 missing)
Imageability 0.000 0.494 0.72/0.37 7 of 7 5 of 5
(1 missing)
Relationship to Inter-rater Portion of Scene Inter-rater Criteria MetWalkability in reliability Variance/Total Reliability of Best-Fit Model (ICC) Variance Significant (p-value) Explained by Variables
Best-Fit Models (number with ICC>0.4)
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Develop Draft Field Manual
Focuses on Urban Design Qualities that Meet Performance Criteria
• Imageability• Enclosure• Transparency• Human scale• Complexity• Tidiness
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Qualitative Introduction to Urban Design Quality
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Detailed Illustrated Steps
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Scoring Sheet
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Next steps
• Test and Refine Instrument
• Provide Lab and Field Training toLay Observers
• Finalize Instrument