Establishing GIS as the Prime Integrator for Roads Management

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Establishing GIS as the Prime Integrator for
Roads Management
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Introduction

• The Integrated Network Vision
• How we might get there
• Things to resolve along the way
• The Benefits

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A Wealth of Data to Manage...

• Visualisation
• Management and public Information
• Layer overlay
• Thematic reclassification
• Navigation and Cross-referencing
• Extracting data from host systems
• Data relationships
• Geographic relationships
• Analysis
• Enabling the power of GIS
• Compare and process

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Layering Data against the network

• Road attributes (eg. reinstatement class)
• Inventory assets (eg. laybys, bus stops)
• Lighting maintenance
• Streetworks notices and management
• Defects and Inspections
• Condition Surveys (UKPMS)
• Properties accessed via the street (NLPG)
• Routes to Properties
• Accidents
• etc...

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A Common Network Model

• Nodes (Junctions)
• the key to Topology Routing
• Links (ESUs)
• the basic junction to junction elements
• Linear Sections - collecting data by odometer
• Asset management
• Condition surveys
• Streets (USRNs)
• the public face of the network
• Classified Roads travelling through the network

Administration Overlays network rather than
defines its structure
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What is Familiar?

• NSG builds ESUs into Streets (USRNs)
• NLPG builds property UPRNs served by USRNs
• USRNs are used by Utility Companies for notices.
• ASD provides further Road characteristics and
  routes notices to responsible agencies
• 200 Highway Agencies contribute to NSG web site.

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Data collected against linear sections

• The Chainage and Offset method
• UKPMS - Deflectograph, Scrim, Visual survey
• Processed within UKPMS systems using a
  commercially secret algorithm to determine
  condition
• Road maintenance system - Inventory, Defects
• Stored in databases against different section
  definitions
• Extracted as Map graphics for presentation

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Linear Section Illustration
The Anti-skid surface has been collected by
recording its start and end distance from the
start of the linear section. It has been given
an Offset code to indicate it is on the left
carriageway
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Network specification problems

• OS data and NSG have no common digitised base
• Different precision (NSG 1 m / OS sub-metre)
• Bottom-up approach merges local data created to
  different standards
• 5 year spread of data currency
• Different expectations from NSG
• for Streetworks and maintenance
• for NLPG
• USRN definition and ESU Splitting to support
  conflicting addressing and administrative needs

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USRN and ESU Splitting

• ITN - Banbury Road
• NLPG suggests splitting into
• Banbury Road - Shipton-on-Cherwell
• Banbury Road - Thrupp
• Banbury Road - Kidlington
• Shipton Bottom
• NSG may have this split into
• Banbury Road - Shipton-on-Cherwell with Thrupp
• Banbury Road - Kidlington
• (or not split at all)
• Banbury Road is the common access into each
  property

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Traditional uses of OS data

• Digitising (tracing) over
• Raster map
• Landline Centreline
• Oscar
• SO...
• Changes / additions made by OS difficult to track
• NSG information not being incorporated into OS
• Building a dispersed and divergent geography

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Currency of NSG
NSG leve1 1 on web site June 2003
Number of Authorities
Last submitted
(NSG Level 3 has not been published)
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Where do we go from here ?

• Plod on will this succeed ??
• We have come so far success is just around the
  corner
• Radical rethink ??
• Migrate to a new base - keeping what has been
  achieved
• Serious consideration of OS ITN / OS MasterMap
  Architecture
• Capitalise on all the new features

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Why ITN

• Nationally coherent OS MasterMap component
• Already capable of generating a coherent NSG with
  ESUs (RoadLinks) Street/Road (Roads)
• Network Topology and routing is in place
• Traffic restriction information is in place
• Links to underlying MasterMap area topology is in
  place to provide a road terrier
• Architecture is geared to constructing linear
  sections

Established Maintenance Process and Extension
Plans
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Using ITN as an NSG Base

• Link TOIDs become the fundamental BS7666-1 ESU
• Road TOIDs become the Street/Road base
• Local digitising disappears and is replaced by
  improved two-way communication with OS on Link
  naming and classification
• Network supplied though ITN rather than NSG
  Website
• NSG Website provides application specific
  cross-references eg. for USRN-TOID migration
• Enhanced expectations on OS ITN scope (footpaths
  etc.)
• Enhanced expectations on OS communication/responsi
  veness

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Implications for NLPG

• Street (or Link) TOID connecting the property
  gains prominence as access point for services
• NLPG records expand to include -
• Sub-streets
• Localities
• NSG no longer needs to be fundamentally changed
  to split roads by locality

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Implications for Surveys and Streetworks

• Potential to provide Associated Street Data based
  on linear sections defined on ITN Link TOID base.
• Ability to communicate nationally and seamlessly
  at street, link or junction level (via TOIDs) to
  identify street works
• Potential to standardise Survey sections on
  Linear sections built from links

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The Oxfordshire Pilot

• A cooperative effort to explore the potential of
  ITN as a universal network base
• OS surveying to identify and discuss network
  naming inconsistencies
• Districts discussing Street naming anomalies with
  OS
• GIS Consultancy supplying infrastructure and
  tools
• Road maintenance system suppliers involved
• Not yet complete - not yet perfect - but a sound
  beginning

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The Integrated Oxfordshire Road Management GIS

• ITN provides the base for
• NSG (with potential to support District LLPGs)
• EXOR Maintenance sections
• MayRise Streetworks/Streetlighting sections
• WDM UKPMS Survey sections
• Goal is all data mapped against ITN base and
  provided as GIS layers for management and public
  information

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Illustrating the Oxford Integrated GIS
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Benefits

• A Real and effective partnership
• Onus on Ordnance Survey to provide network
• Onus on public authorities to use OS network
• Staff time freed to manage assets
• Comprehensive integrated GIS capabilities for
  Highways Management are enabled
• Comprehensive and comprehensible public
  information becomes possible

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Long term implications

• TOIDs become the common coherent and consistent
  communication reference nationally and locally
• TOID object identifiers gradually replace OS Grid
  References and local digitising
• ITN replaces NSG level 3
• Road / Link / Junction / Road surface TOIDs all
  available to provide a self-consistent
  referencing framework

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Conclusions

• An Integrated GIS is in everyones interest
• OS data provides the most sensible base for a GIS
• OS is government funded under the National
  Interest Mapping Service Agreement
• It would therefore be a very good idea to use OS
  data as effectively as possible