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Geodetic Survey Modernisation activities 2014 ISV Surveying Expo

Geodetic Survey Modernisation activities 2014 ISV Surveying Expo. Roger Fraser, Geodetic Survey Office of Surveyor-General Victoria. Outline. Geodetic Strategy Consultation Draft New version of SMES Re-adjustment of Victoria’s GDA94 and AHD survey control networks

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Geodetic Survey Modernisation activities 2014 ISV Surveying Expo

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  1. Geodetic Survey Modernisation activities2014 ISV Surveying Expo Roger Fraser, Geodetic Survey Office of Surveyor-General Victoria

  2. Outline Geodetic Strategy Consultation Draft New version of SMES Re-adjustment of Victoria’s GDA94 and AHD survey control networks Progress towards datum modernisation

  3. Geodetic Strategy Available as a consultation draft Identifies strategic context, priorities and challenges Focussed on improving positioning accuracy and reliability Guided by 2013 Geodetic Infrastructure Questionnaire results Closing date for feedback is 29 August

  4. Geodetic Strategy

  5. Geodetic Strategy

  6. Geodetic Strategy Total responses: 217

  7. Geodetic Strategy Total responses: 177

  8. New version of SMES New interfacewith updated VicMapdata, Google street view Revised survey control mark categories and symbols Flexible search options and several download format options Online submission of sketch plans and raw survey measurements New geodetic measurements database Rigorous network adjustment system for processing of Victoria’s GDA94 coordinates and AHD heights Open Web Services to support location based services applications

  9. New version of SMES maps.land.vic.gov.au/smes

  10. New version of SMES

  11. maps.land.vic.gov.au/smes

  12. maps.land.vic.gov.au/smes

  13. maps.land.vic.gov.au/smes

  14. maps.land.vic.gov.au/smes

  15. maps.land.vic.gov.au/smes

  16. 2014 Victorian Adjustments Victoria’s GDA94 and AHD networks re-adjusted. New constraints GDA94 adjustment fully integrated with GPSnet AHD adjustment aligned with AUSGeoid09 Rigorous uncertainties Automated process within SMES

  17. 2014 Victorian GDA94 Re-adjustment Uncertainty Percentage 0.050 89% 0.025 64% 0.02 50% 0.01 12%

  18. 2014 Victorian GDA94 Re-adjustment Correction Percentage 0.050 97% 0.025 81% 0.02 44% 0.01 10%

  19. 2014 Victorian AHD71 Re-adjustment Uncertainty Percentage 0.050 91% 0.025 60% 0.02 48% 0.01 7%

  20. GDA94 - initial establishment GDA94 constraints

  21. GDA94 – Present foundation Present constraints

  22. Progress towards datum modernisation Revised constraints (AuScope and GNSS CORS) National geodetic networks assembled Reprocessing of all old GNSS data Rigorous adjustment software run on ANU supercomputer Research into best approach for handling deformation and uncertainty Business plan and communication strategy

  23. Progress towards datum modernisation National re-adjustment 2015 1994 2000 2010 2020 GDA94 Established GDA94 Adopted 2012 Update Continuously realised Victorian re-adjustment 2014 Divergence of GDA94 from ITRF (metres) 7cm per year 0 0.4 1.1 1.4 1.8

  24. ITRF velocity model

  25. Progress towards datum modernisation New datum based on 2020 epoch (1.8m difference) Continuously realised frame, and a static realisation New tools and procedures Stakeholder consultations being run to identify issues, implications and best transition approach ICSM PCG and OSGV to provide leadership and assistance to surveying and spatial information stakeholders

  26. Geodetic Survey Modernisation activities2014 ISV Surveying Expo Roger Fraser, Geodetic Survey Office of Surveyor-General Victoria

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