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OS Net™ Ordnance Survey's RTK GPS Network
Mark Greaves
Geodetic Analyst, Ordnance Survey
7th May 2006
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
The Current OS Net Network
• 90 base stations in operation
• Density enables RTK positioning services across most of the country
OS Net structure
OS Net™Data Servers
(OS HQ)RTK for Ordnance Survey surveyors
via GPRS / GSM
Raw GPS data in RINEX format for
www.ordnancesurvey.co.uk/GPS
OS Net base station network
Accuracy of OS Net
All stations
Overall rmse:east: 11mm north: 16mm height: 31mm
Precision of OS Net
All stations
RTK initialisation time
All stations
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.uk/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
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
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
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
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
Contact for further information
Customer Contact CentreOrdnance SurveyRomsey RoadSOUTHAMPTONUnited KingdomSO16 4GU
Phone: 08456 05 05 05
Fax: 023 8079 2615
Email: customerservices@ordnancesurvey.co.uk
Website: www.ordnancesurvey.co.uk
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