3. gis for transport analysis - ncl.ac.uk · modelling transport in gis transport modelling a...
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GIS for Transport Analysis
Alistair Ford
Stuart Barr
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Overview
• What is the need for transport analysis in GIS?
• Transport network modelling
• The Tyndall and ARCADIA Projects
• An overview of the project
• Modelling transport in GIS
• What questions can we answer?
• Other models
• Future tools which will be available
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Modelling transport in GIS
Transport modelling a well-developed field
• Many powerful commercial models
• Simulations of traffic and network performance
• Micro models of individual junctions
• Macro models of whole transport networks
• Models are expensive and complex to run
• Sometimes a more simple solution is needed!
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GIS Network Analysis Most commercial GIS software support networks
• Can analyse nodes and links
• Many applications
• Transport
• Utilities
• Research at Newcastle
• Developing transport analysis in GIS
• Tools for analysts and decision-makers
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The Tyndall Cities Programme
Transport modelling for Climate Change options
• Assess the possible impacts of Climate Change
• What might future damage and disruption be?
• Testing possible adaptation and mitigation
• Assess the suitability of interventions
• The Urban Integrated Assessment Facility
• Consider many aspects simultaneously
• Transport modelling in GIS a key component
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Interface for testing of policy options
Working with
key London
stakeholders
Climate impacts assessment and adaptation planning
Analyse risks of
• Flooding
• Drought
• Urban heat and health impacts
Test adaptation options
Greenhouse gas emissions assessment
module
• Multi-sectoral
emissions accounting
tool
• Detailed sub-modules
for transport (personal
and freight)
Analyse of city-scale
energy policies
Land use and spatial interaction module
• Employment
• Multi-modal transport
• Developed land cover
• Population
• Land use planning
constraints and attractors
MDM-E3 Multi-sector city-scale economics module
• Dynamic resource
interactions between
sectors
• Specialist energy
sector module
Demographic scenarios City-scale climate scenarios
• Temperature
• Precipitation
• Sea level rise
• Storm surge
Urban Integrated
Assessment Facility
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Land-use Transport Model
Simulating future population through interactions
Zone i
Zone j
cij
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Modelling Transport Modes Four different modes of travel
• Road transport
• Individuals incur costs from driving
• Rail transport
• Heavy and light rail services, stations and lines
• Bus transport
• The major bus routes in Greater London
• Travel times modelled through GIS networks
• Further development at NCL…
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Accessibility costs
• Travel time only one component of cost
• Generalised cost of travel computed
Gcar = (Vwk * A) + T + D*VOC/(occ*VOT) + PC/(occ*VOT)
• Represent accessibility between places
• Monetary, spatial and societal costs of travel
• Drive the model of population
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Road costs
Minutes
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Light rail
Minutes
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• Building on Tyndall Cities work
• More advanced modelling
• Feedbacks between models
• More sophisticated transport
• Integrated networks
• Modal interchanges
• Capacity and congestion
• Network disruption
• Delays as costs to business
ARCADIA
Climate Variables
Extreme Weather Events
Economy Variables
Spatial Employment (aggregated
sectors)
Finescale Location of
Employment
Map Spatially
Impact by Weather Event
Transport Network
Infrastructure Damage
Population Locations
Physical Damage
Calculation
Cost to Industry
Cost to Residents
Supply Disruption
Business Interruption Labour
Disruption
Recovery
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Modelling a wider region
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Mapping flows to networks
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Transport Disruption
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• Modelling land-use change
• Finescale grids of development
• Driven by models we’ve seen
• Allow further impact assessment
• Flooding of buildings
• Urban heat
• Air quality
Other models
100m grid
1m grid
Urban parcels
Urban zones
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• Very strong stakeholder focus throughout
• Drive and direction
• Secondments with agencies
• Results, reports, models and key findings
• London-centric up to now
• Generic tools and approaches
• Nationally-available datasets
• Free tools
• Developing an open-source framework
• Aimed at decision-makers and analysts
On-going engagement