Developing a methodology for network simulation

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Developing a methodology for network simulation

• ESpace Conference
• Naples and Benevento June 2005
• Colin Arrowsmith1, Bob Itami2 and Silvester
  (Sungchan) Kim1
• 1Department of Geospatial Science, RMIT
  University
• 2GeoDimensions Pty. Ltd.

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Methodology objectives

• to understand spatial behaviour of mobile objects
  along networks
• to develop typical itineraries for various types
  of mobile objects
• to model mobile objects along networks given
  differing environmental conditions

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Rationale

• predicted increases in traffic flow along
  networks
• physical constraints results in loss of amenity
  and threats to safety
• need to test management options under differing
  scenarios

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Methodology

• develop inventory of network
• survey design - detection, observation and
  recording of mobile objects
• developing typical itineraries for dynamic
  objects
• spatial analyses of movements
• identification of types of dynamic objects
• modelling movements

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Develop inventory

• base spatial information acts as datum for
  analyses and modelling

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Survey design attributes required

• position
• duration
• sequence or itinerary
• flow
• speed and orientation
• type of object

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Survey techniques

• questionnaire and interviewing
• video monitoring
• detectors and sensors
• tracking mechanisms including GPS

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Itinerary determination

• identify network sequences
• classify network sequences
• statistical probability analyses

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Spatial analyses

• extract topological linkages
• apply segmentation for analyses
• duration
• velocity
• diurnal patterns

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Classification of types

• classification of object types using
• cluster or
• data mining techniques
• direct observation

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Simulating movements and behaviour

• agent-modelling
• autonomous agents
• linked to GIS
• agent-rules
• wayfinding

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Case study 1 Loch Ard Gorge

• objective
• to identify typical spatial behaviour patterns at
  a popular tourist attraction
• rationale
• increased visitation to tourist sites with
  constrained physical parameters

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Develop inventory for Loch Ard Gorge
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Attractions

• 26 point attractions
• lookouts
• river
• car parks

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Survey design

• GPS survey
• questionnaire survey

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The GPS receivers used
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GPS survey attributes

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Topological linkages

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Describing spatial-temporal data

• development of regions to assist in describing
  movement patterns

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Nodes visited
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Visitor typologies
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Simulation modelling

• RBSim3 is a computer model
• maintains a database of visitor experiences
  through a simulation
• itinerary can be built for an agent
• agent movement is modified by the changing
  conditions of a network

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RBSim Simulator
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Case study 2 River Traffic Study

• objectives
• rationale

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Objectives

• to determine the capacity of the Yarra and
  Maribyrnong rivers to meet growing demands
• identify management systems and infrastructure to
  control boat traffic in a safe and sustainable
  manner
• develop a management strategy to control river
  traffic

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Rationale

• broad range of users and vessels with different
  patterns of use
• knowledge of impacts of different watercraft on
  environmental and social conditions is uncertain
• volumes of traffic predicted to increase
  substantially
• capacity of river has not been defined

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Inventory development

• river depth
• bank conditions
• land and water facilities
• adjacent land use

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Inventory development
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Survey design

• interviews with user groups
• new river counts
• published schedules
• GPS tracking

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GPS Tracking
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Topological linkages
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Patterns of movement
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Boat types

• rowing boats
• commercial craft
• government vessels
• motor charter
• tug boats
• motor private
• ship
• non-motor sail
• sail under motor
• non-motor oar
• non-motor paddle

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Conclusions

• developed a consistent methodology that can be
  applied to model mobile objects along different
  networks under different management scenarios

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