Geodetic Survey Modernisation activities 2014 ISV Surveying Expo Roger Fraser, Geodetic Survey Office of Surveyor-General Victoria.

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Presentation transcript:

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 Progress towards datum modernisation 2

Geodetic Strategy 3 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

Geodetic Strategy 4

5

6 Total responses: 217

Geodetic Strategy 7 Total responses: 177

New version of SMES 8 New interface with updated VicMap data, 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

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

New version of SMES 10 LegendDescription SCN Mark. PM with adjusted GDA94 coordinates, no AHD height SCN Mark. PCM with adjusted GDA94 coordinates, no AHD height SCN Mark. PM with estimated GDA94 coordinates, levelled AHD height Non-SCN Mark. PM or PCM with estimated GDA94 coordinates, no AHD height Non-SCN Mark. PM or PCM with estimated GDA94 coordinates, estimated AHD height SCN Mark. PM with adjusted GDA94 coordinates, levelled AHD height SCN Mark. PM with adjusted GDA94 coordinates, estimated AHD height Defective PM or PCM

maps.land.vic.gov.au/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

2014 Victorian Adjustments 16 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

2014 Victorian GDA94 Re-adjustment 17 UncertaintyPercentage % % % %

2014 Victorian GDA94 Re-adjustment 18 CorrectionPercentage % % % %

2014 Victorian AHD71 Re-adjustment 19 UncertaintyPercentage % % % %

GDA94 - initial establishment 20 GDA94 constraints

GDA94 – Present foundation 21 Present constraints

Survey Control Network 22

Progress towards datum modernisation 23 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

Progress towards datum modernisation GDA94 Established Continuously realised 2012 Update National re-adjustment 2015 Victorian re-adjustment 2014 Divergence of GDA94 from ITRF (metres) 7cm per year GDA94 Adopted

ITRF velocity model 25

Progress towards datum modernisation 26 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

Geodetic Survey Modernisation activities 2014 ISV Surveying Expo Roger Fraser, Geodetic Survey Office of Surveyor-General Victoria