presented by: leila hernandez dennis manglicmot gmat 9205 fundamentals of geo-positioning
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Presented by:Leila Hernandez
Dennis Manglicmot
GMAT 9205 Fundamentals of Geo-positioning
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Continuously Operating Reference System (CORS)Permanent base stations that are used
to continuously observe and measure using Global Navigation Satellite System (GNSS)
provide real time accurate positioningIncorporated into networks to reduce errors
and to have a capability to deliver positioning services for a state, a country or world-wide
Used as part of the realization of the State Datums
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AgricultureMiningConstructionScientificSurveyingNavigationMapping
CORS Application
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Some of the CORS Networks in Australia AFNARGNGPSnetwork PerthSouth Australia CORS networkSmartNet AusSunPOZVICmap POS GPSNet™CORSnet NSW
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CORS: AustraliaAustralian Fiducial Network (AFN)
comprises of 8 stations within mainland Australia (including Tasmania)
Connects to ITRF
Australian Regional GPS Network (ARGN) – combination of the AFN and 8 other stations beyond the mainland Australia
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GPSnetwork PerthUses Virtual Reference
Stations (VRS) to eliminate potential systematic errors
World’s first privately owned and operated VRS network which supports GNSS capabilities
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South Australian CORS NetworkMetro Network – 8
operating stations with 2cm accuracy using NRTK within 80km of Adelaide CBD
SA Statewide Network
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SmartNet AusUtilises Leica Geosystems’ Spider software to
create RTK corrections in various formatsAvailable in South Australia and in Gold
Coast, QLD
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SunPOZ
Covers south-east corner of Queensland
Uses Trimble’s VRS™ technology
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VicMap Position - GPSnet™• Private and
public stakeholders
• More than 100 stations
• Accuracy: ±2cm within 25km of CORS
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Number of stations
May
2011: 61 Future:
120
Data Services DGPS RTK RINEX
CORSnet-NSW
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Additional InformationVicMap POS GPSNet™ is currently the
largest CORS network in Australia
In Perth and South Australia, reference stations are managed by private companies
Data accessibility can sometimes be an issue
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CORS and Reference Datum WGS84 • recalculated every few years for GPS control
GDA94 • based on ITRF92 but is fixed on a number of reference points in Australia• compatible with modern positioning techniques e.g. GPS
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ConcernsSurveyors and spatial professionals
represents only a small minority of future CORS users in Australia.
ITRF is realised every 3 or so years and Australian Datum is realised every 30 years or so
Plate tectonic movement of 7cm per year NNE direction
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Concerns (cont’d)The need to have modern GNSS positioning
techniques and surveying techniques and to ensure they are accurate, reliable and easy to use
Interoperability with other state’s CORS networks
Compatibility of AUSPOS
Legal Traceability
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Significant distortions in the GDA94 (1997) for NSW
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Solution: GDA94 (2010)Defined to improve shortcomings of the initial
datum definition and reduce distortion3-dimensional coordinate systemProvides direct connection to the Australian
Fiducial Network (AFN) and Australian Regional GNSS Network (ARGN)Potential sources of error eliminatedDistortion-free spatial control across the networkImproved positioning framework
Regulation 13 certificates
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Global GDA implementationCORS networks using ‘global’ GDA
VicMap POS GPSnet™SmartNet Aus
CORSnet NSWSunPOZ
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A few things to note:
Complete re-adjustment of geodetic ground control networks in NSW will be done after GDA2015 is implemented.
Site calibration will continue to be essential GNSS survey practice in NSW to relate the two realisations of GDA94 to each other.
However, site calibration is essential only for applications that needs to be tied to existing ground control network
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References:GPS Network Perth 2011, GPS Network Perth , viewed
29 May 2011, <http://www.gpsnetworkperth.com.au>.Haasdyk, J 2009, “Automatic Bernese Processing of
CORSnet-NSW GPS data for deformation monitoring” , Engineering thesis, University of New South Wales
Janssen, V & McElroy, S 2011, “Coordinates and CORSnet-NSW: Dealing with distortions in GDA94”, Position, no. 50, pp. 24-27.
Janssen, V and White, A and Yan, T (2010) CORSnet-NSW: Towards state-wide CORS infrastructure for New South Wales, Australia. In: Proceedings of XXIV FIG International Congress, 11-16 April 2010, Sydney, Australia.
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References (cont’d):NSW Land and Property Management Authority c 2011,
CORSnet-NSW, LPMA, booklet.Roberts, C 2009, “CORS GNSS networks: A Superior
Infrastructure for Precision Agriculture”, Southern Precision Agriculture Association Conference, Adelaide, 4 September 2009.
South Australian CORS Network, viewed 29 May 2011, <http://www.cors.com.au/technical-info/cors-network>.
Victoria Department of Sustainability and Environment, Vicmap Position – GPS net, DSE, booklet.
VicMap Position - GPSnet 2011 , VicMap Position – GPSnet, viewed 29 May 2011 <http://gnss.vicpos.com.au>.