OS Net

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OS Net Ordnance Survey's RTK GPS Network

• Mark Greaves
• Geodetic Analyst, Ordnance Survey
• 7th May 2006

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What is OS Net?

• National GPS infrastructure and service developed
  by Ordnance Survey to provide up to 1cm accuracy
  real-time positioning
• Enables positioning against OS MasterMap and
  supports Digital National Framework (DNF)
  principles

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The Current OS Net Network

• 90 base stations in operation
• Density enables RTK positioning services across
  most of the country

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OS Net structure
OS Net base station network
RTK for Ordnance Survey surveyors via GPRS / GSM
Raw GPS data in RINEX format for www.ordnancesurve
y.co.uk/GPS
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Accuracy of OS Net
Overall rmse east 11mm north 16mm
height 31mm
All stations
6
Precision of OS Net
All stations
7
RTK initialisation time
All stations
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What OS Net enables

• Up to centimetric level positioning service for
  Ordnance Survey surveyors
• Real-time, raw GPS data feed to OS Net partners
  to create commercial positioning products
• Access to the national coordinate reference frame
  through free products from www.ordnancesurvey.co.u
  k/gps
• Data to the Meteorological Office to aid their
  weather forecasting models and for some academic
  studies
• Support to pilot studies in applications outside
  of agreed partner terms

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OS Net benefits

• Delivering efficiency and flexibility to Ordnance
  Survey
• Supports local and national applications that
  require a positioning element
• Enables quicker easier positioning
• Supports interoperability of data and the use of
  a common coordinate system
• Provides a revenue opportunity

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Commercialisation through Partners

• OS Net can bring significant efficiencies to any
  application that uses GPS
• Initially entering high-accuracy markets where
  most benefit can be realised
• Work to foster new market areas

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Future direction of OS Net

• Short term
• Strengthening network and possibly extending into
  north west Scotland
• Work with partners and policy developers to
  develop and position OS Net
• Medium term
• Infrastructure will be renewed with dual GPS
  Galileo receivers
• Galileo test bed in the south east. Aid internal
  and national understanding of what Galileo will
  bring
• Work towards the goal of ubiquitous survey
  quality positioning, through involvement in
  external projects and the development of OS Net

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Summary

• OS Net used internally by 130 field surveyors
• Recent accuracy testing has shown 1-2cm
  horizontal accuracy, 3cm vertical accuracy
• Partners are taking the raw data from OS Net to
  build commercial services
• OS Net has the capability to support national
  policy initiates that require positioning
• Expanding OS Net into the NW of Scotland is being
  considered
• OS Net will be updated to support Galileo

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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
• Website www.ordnancesurvey.co.uk