EDINA OS MasterMap Workshop

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EDINA OS MasterMap Workshop

• Colin Henderson
• Senior Developer, Pre and Post Sales Support
• 16/12/2003

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Agenda

• Where are we with OS MasterMap
• OS MasterMap future layers
• Characteristics of OS MasterMap for data supply
• Benefits of using OS MasterMap

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What is OS MasterMap ?

• Ordnance Survey's new DNF (Digital National
  Framework) based large-scale product and on-line
  service

Accessible
Definitive
Intelligent
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The Digital National Framework

• A spatial data framework for Great Britain, built
  on
• The National Grid
• A classification of real world features
• A unique identifier for each feature (TOID)

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Geographical Lego

• OS MasterMap provides the
• Building blocks to build different real world
  objects
• A field, a residential property, a census output
  area or the Millennium Stadium, Cardiff.
• A standard protocol for connecting objects
• The TOID unique identifier

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DNF Enabling the bigger picture
LLPGs and NLPG
NLIS - with automated constraint checking
Joined-up Government
CRM
E-government targets
Web access to services
Deliverance of best value
Planning portals
Back office integration

• Drivers to improve accessibility and quality of
  GI within the organisation
• Corporate strategies for GI management are ever
  more important
• OS MasterMap is seen by many as providing the
  framework on which to build corporate GIS, and
  provide the catalyst by which GI contributes to
  e-government targets and the increasing demand
  for business efficiency.

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OS MasterMap the product
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Topography Layer

• .. Is not OS MasterMap
• Some key terms
• TOIDs
• . and Version
• Objects / features
• Database (and map)
• Interdependence

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Address Layer

• What Is it?
• Like Address Point, it is based on the Royal Mail
  Postcode Address File (PAF)
• Every GB postal address georeferenced with a 0.1m
  coordinate
• Includes all properties receiving mail, incl.
  flats and multiple properties within buildings
• Each address is given a unique identifier known
  as a TOID
• Each address feature located within a building is
  linked to the corresponding Topo polygon
• Data are maintained and continually updated

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Address Layer
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Integrated Transport Network (ITN) Layer

• What Is it?
• Link and node network comprising
• Geometry suitable for network and routing
  analysis
• Road Routing Information (RRI) to describe rules
  and restrictions that may constrain the analyses
• Additional themes to be added over time
• Pedestrian network
• Rail network
• Navigable waterways network

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Integrated Transport Network (ITN) Layer

• Road Routing Information references Links and
  Nodes

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Integrated Transport Network (ITN) Layer

• More detail .
• Includes motorways, A,B and minor roads, local
  streets, private roads (publicly accessible or
  restricted access)
• Each link and node is given a TOID
• Each Road Link feature is referenced to the
  corresponding Topo polygon (by TOID)
• Attached attribution describes feature
• Single carriageway, dual carriageway, slip road,
  roundabout, tunnel, access to car parks, etc.
• Length of link in metres
• Motorway Junction number
• Data are maintained and continually updated

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Integrated Transport Network

• ITN links reference the Topography Layer

TOID 4000001298764523 Version 1 Change
Date 310303 Descriptive Group Road
Topology Descriptive Term Local Street Nature of
Road Single Carriageway Length 42 Start
Node 4000004756364758 End Node 400000985736452
8 Reference to Topo 1000000139421883,
1000000139417597
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Imagery Layer

• What Is it?
• Colour, orthorectified aerial photography
• 25cm resolution
• Seamless
• Uniform specification across GB
• 3 yr update cycle, weather permitting!

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Imagerys value in location analysis

• What the Topography Layer might not reveal

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Interoperability of OS MasterMap Layers
Referencing and locating postal addresses
Association to topographic features
Navigation and routing applications
Imagery
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OS MasterMap - The Future
Now
Address
The Future
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Characteristics of OS MasterMap for data supply

• More than just a map!
• A rich dataset of features
• TOIDs Unique reference IDs
• Seamless dataset per feature rather than per
  tile supply

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What is an OS MasterMap feature?

• OS MasterMap data is a set of features
• A feature is the OS MasterMap representation of a
  real world object
• What is a real world object?
• OS MasterMap has not changed the OS view of the
  world

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What is a feature?

• Some features represent a single real world
  object (e.g. a building, a pond, a bench mark)
• Other features represent only part of a real
  world object (e.g. part of a wood)...
• ...or more than one real world object (e.g. a
  fence, connected to a hedge, connected to a wall)
• Some features represent non-physical objects,
  (e.g. administrative boundaries, inferred links).

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TOIDs Unique reference IDs

• A unique identifier for each object
• Allowing individual feature identification
• With a defined lifecycle and version number

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Feature supply not tile supply!

• Builds on object oriented model
• Full extent of data crossing the area of
  interest is supplied
• Results in the supply of hairy data

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Benefits of using OS MasterMap

• Improved speed of data capture
• South Gloucs improved data capture times on
  redlined boundaries by a factor of five
• Common data exchange
• Offers the potential to share data via a text
  file where systems incompatibility exists (TOID
  reference)
• Integration with other layers (Addresses, ITN,
  Imagery)
• Change only updates
• Change file could be used as a trigger for
  checking changes in user data

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Questions .
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Contact for further information

• Customer Contact CentreOrdnance SurveyRomsey
  RoadSOUTHAMPTONUnited KingdomSO16 4GU
• Phone [phone]
• Fax [phone]
• Email customerservices_at_ordnancesurvey.co.uk
• Web site www.ordnancesurvey.co.uk