MEASURING ACCESSIBILITY USING GIS MEASURING ACCESSIBILITY USING GIS Rui Pedro Julião Department of Geography and Regional Planning New University of Lisbon.

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Presentation transcript:

MEASURING ACCESSIBILITY USING GIS MEASURING ACCESSIBILITY USING GIS Rui Pedro Julião Department of Geography and Regional Planning New University of Lisbon GeoComputation‘99

INTRODUCTION Accessibility is a key issue Traditional evaluation methods don’t consider a real spatial model Arc/Node logic versus Territorial logic Accessibility measurement Methodology Lisbon and Tagus Valley Region

STARTING ISSUES Graph Theory - Vector model Continuous surface - Raster model Geometry versus Analysis 3-step methodology: 1 - Data Acquisition and Integration 2 - Cost Surface Modelling 3 - Accessibility Analysis

DATA ACQUISITION AND INTEGRATION Geographical information Line weeding Reclassification Road CategoryLevel IP highway41 IP 2 lane21 IC highway42 IC 2 lane22 National Road23 Regional Road24 Municipal Road (former national) 25 Municipal Road26

COST SURFACE MODELLING CCT – Cell Crossing Time (min) P – Pixel Size (m) TS – Travelling Speed (Km/h) Considering a 2-lane IP: 6 Km/h outside the road network CCT = 1 minute RoadAverageCell Crossing CategorySpeedTime CategorySpeedTime (min) IP highway IP 2 lane IC highway IC 2 lane National Road Regional Road Municipal Road (former national) Municipal Road Off-road cost surfaces: 2 cost surfaces: –With highways –Without highways

ACCESSIBILITY ANALYSIS COST SURFACE ORIGIN COST DISTANCE FUNCTION ACCESSIBILITY SURFACE ALLOCATION

ACCESSIBILITY TO THE HEAD OF MUNICIPALITY Cost surface calculation without considering the highway network.

ANALYSIS WORKFLOW Accessibility to head of municipality and territorial allocation based on a cost surface calculation without considering the highway network

TERRITORIAL ALLOCATION Which territory should belong to each municipality according to accessibility measurement

ACCESSIBILITY TO HIGHWAY NODES

ACCESSIBILITY TO LISBON Considering highways and the other road network

ANALYSIS WORKFLOW 3-Step calculation: a) estimate the travelling time to each highway node; b) estimate the travelling time and territorial allocation for each highway node; c) add the travelling time from Lisbon to the node to its hinterland’s travelling time + evaluation of alternatives

CONCLUSIONS Accessibility as key issue for many different studies n Methodological basis for accessibility measurement n GIS enables a full and dynamic territorial coverage n Future developments:Traffic data / Vehicle data Barriers Urban network data Population density Land use / Land cover