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Using GIS Network Analysis to Evaluate Spatial Accessibility and Equality of Green
Space in Kunming, China
a Department of Geography, National University of Singaporeb School of Resource and Environmental Science , Wuhan University
Xiaolu ZHOU a, Yi-Chen WANG a, Han HU b,
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Outline
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Principles of sustainable development
Concept: Meets the needs of the present without compromising the ability of future generations to meet their own needs. (Charles et al., 1998)
Environmental well‐being
Economic Development
Social Equality
“Three E’s” of Sustainability (Ahern, 2007)
Green space
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Rendering aesthetic enjoyments
Promoting physical health
Adjusting psychological
well-being
Enhancing social ties
Providing Educational opportunities
Providing recreational opportunities
Playgrounds
Green
Space
Scientific studies
Self concentration Attractive appearance
Euphonious sound
Fragrant smell
Physical activity in the agreeable environment
Psychological restorative
Emotional relief
Stress reducer
Social contacts
Communications
Adapted from sustainable development commission in UK
Social functions of green space
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Providing recreational opportunities
Enhancing social ties
Promoting physical health
Rendering aesthetic enjoyments
Providing Educational opportunities
Adjusting psychological well‐being
Picture source :from sustainable development commission in UK
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Problems in urban green spaces
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Picture source :from sustainable development commission in UK
AccessibilityThe ease extent to which one place may be reached from other places under a certain travel model (Liu & Zhu, 2004)
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Study Area
Why do we select Kunming as the study area?a.Ecological City b.Improvement in Green Space
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Data
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Methods
Network construction
Green space service ability definition
Green source definition
Green service area calculation
Green service area
Green service area in four districts
Serviced residential area
Serviced residential areain four districts
Digitization Classification
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Define green space service ability
Area(50 %) Level(50%) Service ability
4 7 5.5
7 8 7.5
4 6 5
… … …
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Network construction
Picture source :Networks analysis, Yang, K.C.
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Service Area and Service Ability
District Service area in 2009(km2)
Service area in 2010(km2)
Wuhua 22.55 37.17Panlong 20.88 29.19Xishan 31.10 41.87Guandu 16.94 20.15
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Green covered residential area and green service ability
District 2009 2010
Blocks being served (km2)
Percentage of blocks being served (%)
Blocks being served(km2)
Percentage of blocks being served (%)
Wuhua 4.51 0.47 6.29 0.66Panlong 3.85 0.58 5.36 0.81Xishan 3.74 0.34 6.16 0.57Guandu 1.82 0.41 2.51 0.57
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• Improvements and defects in green space accessibility and service ability
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• Accessibility measurements – Buffer methods
– Raster‐based impedance model
– Gravity‐based model
• GIS in accessibility network analysis– Ability to simulate road networks
– Accurate calculation of shortest route
– Explicit expression of distance decay
– Easy definition of the source attractiveness
Picture source: ArcGIS 9.2 Desktop Help
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• Further studies – Accessibility analysis combined with field survey to define service
ability and to classify green space
– Complete green space system
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• This study explored the accessibility to green space in two time periods in Kunming. It found that the accessibility to green space will be conspicuously improved in 2010 Master Plan.
• There are still some communities are not well covered by green space service, the spatial equality cannot be put as perfect.
• GIS based accessibility analysis is a valuable means to measure the green space accessibility ,and therefore, viewed from an extensive perspective, it is also an important standard to measure the spatial equality.
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Thanks