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Department of Sustainability and Environment

Spatial Information InfrastructureStrategic Projects and Policy

Melbourne GIS User Group

GNSS & Victoria’s CORS Network

Presenter:

Hayden Asmussen - GPSnet Project Officer 

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Presentation Overview

• Part 1 - Satellite Positioning Background & GPSnet

• Part 2 - VICpos & MELBpos

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Part 1 - GNSS and CORS

• GNSS:Global Navigation Satellite Systems

 – Includes Satellite Constellations from:

GPS - American (currently 29)

GLONASS - Russian (currently 14)

GALILEO - European (currently 1 test Satellite)

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Continual Operating Reference Station Networks - Global Trends

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CORS Networks - Australia

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CORS Networks - State

SUNpoz

Darwin CORS

SydNET

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GPSnet Infrastructure – Base Stations

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GPSnetTM is a series of 24

(CORS) GPS Base Station

strategically located at

DSE/and non DSE locations

within Victoria.

Cooperative network of basestations developed and

installed in partnership with

government, academia, the

spatial industry and the

community.

It provides post processing

from all sites and Single

Base Real-time Kinematic

(RTK) from 9 sites via local

radio.

GPSnet Base Stations

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GPSnet Co-ordination

• Coordination of GPSnet CORS sites

 – GDA94 compatibility

 –  VICpos/MELBpos centimetric absolute accuracy

 – GPSnet designed for use in Victoria

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GPSnet Legal Traceability

• Legal Traceability of Position

 – GPSnet certification

 –  ‘Best Practice’ 

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GPS/GPSnet and Cadastral Surveying

 –  Approved for Cadastral Surveying by SGV 

 – Land Surveyors using GPSnet for cadastral Surveys NOW

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• Part 1 - Satellite Positioning Background & GPSnet

• Part 2 - VICpos & MELBpos

Presentation Overview

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• VICposTM - a subset of 17

GPSnet Base Stations

• Provides Networked real-

time sub-metre DGPS

corrections across the entire

state.

• Applications include asset

mapping, real-time feature

navigation, GIS and

Precision Ag.

• Provides real-time Single

Base solutions at cm(s)

level. (Best Practice 20km)

Part 2 - VICpos & MELBpos

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GPSnet Infrastructure - Melbourne and Environs Network 

•  MELBpos Phase 1 -

Operational 10 Jan 2006

• Sub 2cm accuracy Horiz

using NRTK solution.

• GPSnet University of 

Melbourne now operational

Melbourne University

•  MELBpos Phase 2 -

Densification North, NorthWest and West of 

Melbourne

• Targeting local

government, utility

companies and land

surveyors

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The VICpos/MELBpos Service

What it looks likeHow it works

• GPS data streamed to centralserver from 17 active GPSnet

base stations

• This data is processed and

distributed as a networked

DGPS or Networked RTK

• Real-time corrections

distributed over the internet via

(NTRIP) in CMR or RTCM

format

• Users access the data

corrections via a GPRS and

Bluetooth enabled mobile

phones

Internet   MobilePhone

GPS

Bond devices

using Bluetooth

Connection tointernet via

GPRS

ADSL

connection

Field Applications

Mobile/Asset GISSurvey

 NTRIP

Agriculture

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Reference Station dataReference Station data

is streamed to Centralis streamed to CentralServer Cluster in GeelongServer Cluster in Geelong

Initial Rover PositionInitial Rover Position

sent to server forsent to server forcorrectioncorrection

 VRS corrected position VRS corrected position

is calculated at the Roveris calculated at the Rover

 VRS position is based VRS position is based

on corrections fromon corrections from6 closest GPSnet Base6 closest GPSnet Base

StationsStations

Server uses VRS positionServer uses VRS position

to create correctedto create corrected

real-time datareal-time data

The Rover uses short rangeThe Rover uses short range

 VRS data VRS data

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GPSnet Real Time Server Cluster

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GPSnet Nodes Streaming Real time Raw Data

To Central Server Cluster

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GPSnet Station Accuracy Monitoring

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MELBpos NRTK Compatible Equipment

GSR2700 IS

R8

SmartStation

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 VICpos/MELBpos- Users

Water Management and Asset Capture – Barwon Water

• Asset management

• Maintenance crews identify

  exposure points of underground

  water pipes

Source: Victoria DSESource: Barwon water 

Source: Barwon water 

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30,000 Stormwater Drainage Pits

 VICpos/MELBpos- Users

Survey and Engineering Applications – Dandenong City Council

Source: LandMark

Source: Victoria DSE

• Drainage mapping - 30,000 pits

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 VICpos/MELBpos- Users

 Asset Mapping/Risk Management – Moonee Valley City Council

• Identify footpath cracks and hazards

• Dispatch maintenance crews

Source: LandMark

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MELBpos- Users

Surveying – Land Development Consulting

• Surveyors using service

• Removes need for local base station

• Very quick initialisation

• 1 - 2 minute setup time from cold start

• Minimal costs

Source: Victoria DSE

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 VICpos/MELBpos- Users

Precision Arborist - PRECISE GIS

Source: Victoria DSE Source: Victoria DSE

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 VICpos- UsersPrecision Agriculture

• Precision Farming

  (autosteer to 2cm)

Source: Victoria DSE

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MELBpos- Users

Search and Rescue – Victorian Water Police

Side Scan Sonar for submerged objects

• Identify potential targets during pass

• Dispatch divers on-site

• Record data about target

Source: Victoria DSE

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Benefits

• Efficient and cost effective spatial control

• Reduced cost of entry to networked RTK GPS positioning• Strict GDA94 spatial control via MELBpos and VICpos

• Support for legally traceable GPS measurements for position

• Sub 2cm horizontal positioning in the MELBpos Phase 1 area

• MELBpos Phase 2 (host site currently being investigated)

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To Subscribe Go To:

www.nre.vic.gov.au/gpsnet

See News and Events

GPS Technical Support Newsletter (free subscription)

For More Information

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QUESTIONS?