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A GIS Based Investigation of Spatial Accessibility to Healthcare Facilities within an Urban Fringe Area of Melbourne, Australia
Gang-Jun Liu Salahuddin Ahmad Benno Engels
School of Mathematical and Geospatial Sciences
RMIT University, Melbourne, Australia
29th August 2013
RMIT University©2013 [email protected] 1
Outline
1. Objectives and Methodology
2. Study Area, Data and Results
3. Discussions, Conclusions, and Next Move
RMIT University©2013 [email protected] 2
Objectives • Uncover hidden patterns of spatial variations in accessibility to healthcare facilities
• Locate spatial clusters of disadvantaged locations and communities
• Produce useful evidence for improving–understanding / explanation–policy making and evaluation–spatial accessibility, wellbeing and quality of life
RMIT University©2013 [email protected] 3
Methodology Procedures1. Locating
– people– healthcare facilities– transportation networks
2. Relating– them at fine spatial resolution
3. Measuring– spatial concentration of people– levels of services / attractiveness of healthcare facilities– travel impedance (distance, time, etc.) via transportation network – spatial accessibility from residential locations to locations of healthcare facilities
4. Identifying spatial clusters of disadvantaged locations that have– High concentration of people (need), and– Low level of healthcare service provision (hence, poor spatial access to healthcare
facilities)using spatial statistical indicators and spatial overlay operations
5. Leading to better understanding / explanation; evidence-based policy making and evaluation; and effective strategies for spatial optimisation.
RMIT University©2013 [email protected] 4
Methodology Spatial Accessibility• Perspectives
–Interactions among demand, provision and transport
–Utility and constraint imposed by the interplay among space, time, and thematic domain
–Potential vs realised , objective vs subjective, …
• Measures –Opportunity based measures–Ratio based measures–Impedance based measures–Gravity based measures–Utility based measures–Constraint based measures
RMIT University©2013 [email protected] 5
Origin (Demand/Population)
Destination(Supply/Opportunity/
Service/Facility)
Trip
Transportation Network
Transport Mode
Travel Route
User-centredAccessibility
(WHO)
Points in Time(WHEN)
Locations in Space (WHERE)
Opportunities / facilities(WHAT)
Study Area
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Area: 1,281 km2
Population: 45,552Dwelling: 21,075
(ABS 2006)
Data
RMIT University©2013 [email protected] 7
Source Type Description FormatABS Spatial Mesh Block boundary Polygon
Census Collection District Boundary
Polygon
Attribute Census Collection District level population census of 2006
Excel Table
VicMap Spatial Address points Point Admin boundaries (Shire and locality boundary)
Polygon
Road network Line Rail network, train stations Line, Point
Metlink Spatial Bus routes, bus stops Line, Point Attribute Time tables PDF
DHS Address and attribute
Health care services locations and attribute
Excel Table
Yellow Pages Address and attribute
Health care services locations and attribute
CSV
ResultsLocating and relating 8 categories of land use, MB level population and dwellings, Locations of health care facilities, and
Transport infrastructure (links / routes and stops /
stations).
Measuring and identifying Travel distances and travel times (max, mean, SD) % of population in specific travel distance / time zones
Spatial Clusters of disadvantaged locations /
communities
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RMIT University©2013 [email protected] 11
Transport Infrastructure
Car Ownership> 30% of dwellings have one or no car in 2006
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Trav
el D
ista
nce
Trav
el T
ime
Pharmacy GP / Surgeon Dentist)(
h
nkk
kij v
lT
RMIT University©2013 [email protected] 13
Health care facilities
Maximum(m)
Average (m)
SD (m)
Pharmacy 24,478.3 3,228.6 3,348.9
GP/Surgeon 26,996.1 5,848.2 4,861.7
Dentist 31,393.4 6,187.6 6,275.6
Summary statistics of travel (driving) distance (ABOVE) and travel (driving) time (BELOW) from MB centroids to nearest health care facilities
Health care facilities
Maximum (min)
Average (min)
SD (min)
Pharmacy 31.24 3.91 3.93
GP/Surgeon 34.40 6.45 5.36
Dentists 38.78 6.57 5.86
RMIT University©2013 [email protected] 14
RMIT University©2013 [email protected] 15
Pharmacy GP / Surgeon Dentist
Trav
el D
ista
nce
Trav
el T
ime
RMIT University©2013 [email protected] 16
Summary statistics Pharmacies GP/Surgeons clinics Dentists Ai
Minimum 0 0 0 0.0014Maximum 1 1 1 0.9978Mean 0.1314 0.2159 0.1965 0.1717SD 0. 136773 0.1801 0.1998 0.1366jj
jij
ij dd
ddD
minmax
min
Identifying Spatial Clusters of Disadvantaged Locations / Communities
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A: 9% (~ 4000 persons)
Identifying Spatial Clusters of Disadvantaged Locations / Communities
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B: 4.5% (~ 2000 persons)
Identifying Spatial Clusters of Disadvantaged Locations / Communities
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C: 5.5% (~ 2500 persons)
Identifying Spatial Clusters of Disadvantaged Locations / Communities
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A B C
Identifying Spatial Clusters of Disadvantaged Locations / Communities
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A B C Scenario 1 Scenario 2
1 1 1 1 11 1 2 3 11 1 3 3 11 2 1 3 11 2 2 3 21 2 3 3 31 3 1 3 11 3 2 3 31 3 3 3 32 1 1 3 32 1 2 3 22 1 3 3 32 2 1 3 22 2 2 2 22 2 3 3 22 3 1 3 22 3 2 3 22 3 3 3 33 1 1 3 13 1 2 3 33 1 3 3 33 2 1 3 33 2 2 3 13 2 3 3 33 3 1 3 33 3 2 3 33 3 3 3 3
Identifying Spatial Clusters of Disadvantaged Locations / Communities
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~ 2500 persons~ 2000 persons
Discussions: Measuring Travel Impedance
• Travel time–Speed limits (infrastructure vs agent)–Time of the day / week / year (seasonality)–Direction–Weather condition
• Travel distance –Straight line distance–Road network distance–Impact of multimodal network connectivity, distance decay, path slope and fitness level of people
RMIT University©2013 [email protected] 24
RMIT University©2013 [email protected] 25
Distance Measure Distance (m)L0 - Straight Line 1690.4L1 – Network, Flat 1890.4L2 – Network, Slope 1902.9L6 – Network, Slope, Strong 2969.1L9 – Network Slope, Average 3502.2L12 – Network, Slope, Weak 4035.3
RMIT University©2013 [email protected] 26
Travel Distance to Nearest Maternal and Child Health Centre for Households with Children Under 5 years of Age
Conclusions 1. Spatially dispersed population and uneven distribution / provision of
healthcare facilities across geographical space leads to location advantages and disadvantages by virtue of where people live
2. Location-Enabled Approaches underpinned by spatial datasets and GIS-based spatial analytical procedures have been used for
– the mapping of people, healthcare facilities and transport system– the measurement of population concentration, network based travel
impedances between population centres and sites of healthcare provision, and ease of access to these essential services and facilities by local communities
– the identification of spatial clusters of disadvantaged locations / communities
3. With proper modifications of the datasets and analytical settings, the methodology developed in this study would be applicable to different population groups, practical issues, time periods, and geographical (either urban or rural) settings where spatial accessibility is an important issue.
RMIT University©2013 [email protected] 27
Next Move1. Better understanding / representation of the
• need and preference of population groups,• capacity / attractiveness of health care facilities,• multimodal transportation system, including
– connectivity of links / routes, and – capacity / attractiveness of stops / stations;
2. Better measurement of accessibility, by• using improved data,• considering impacts of ICT / ITS, and• developing more appropriate formulation of
accessibility measures.
RMIT University©2013 [email protected] 28