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FROM THE OFFICE OF SURVEYOR-GENERAL VICTORIA

FROM THE OFFICE OF SURVEYOR-GENERAL VICTORIA. ISV GLENELG GRAMPIANS GROUP SEMINAR 21 November 2013. David Boyle Deputy Surveyor-General Victoria. General topics. OSGV Now with DTPLI Not linked to DEPI OSGV Operations – major projects – SMES update

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FROM THE OFFICE OF SURVEYOR-GENERAL VICTORIA

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  1. FROM THE OFFICE OF SURVEYOR-GENERAL VICTORIA ISV GLENELG GRAMPIANS GROUP SEMINAR 21 November 2013 David Boyle Deputy Surveyor-General Victoria

  2. General topics • OSGV • Now with DTPLI • Not linked to DEPI • OSGV Operations – major projects – SMES update – legislation – Survey Co-ordination Regs and Cadastral Regs • SRBV • A new Board • CRSBANZ - new “Brown Book” to set educational /university standards • ePlan • ICSM/ANZLIC • Connection to MGA94 and the Practice Directives

  3. ePLAN DEVELOPMENTS ISV GLENELG GRAMPIANS GROUP SEMINAR 21 November 2013 David Boyle Office of Surveyor-General Victoria

  4. Plan types – Simple to relatively complex

  5. Plan types – Simple to relatively complex The ePlan visualiser handles simple to medium complexity plan layouts quite well, including showing easements, restrictions and plans containing owners corporation. It also generates boundaries defined by buildings and building returns.

  6. Biggest challenge: “De-clutter” labels in crowded areas

  7. ePlan Vendors Progress Update

  8. Implementation Progress • Received 9 ePlan submissions since May 2013 – 1 registered • Received 11 test ePlans from surveyors in the pilot program • Provided 3 hands-on training sessions for LISCad users • Designing training courses for Geocivil users • Continuing to improve the visualiser • Working with vendors to extend their application types

  9. Nationally – ANZLIC and ICSM ISV GLENELG GRAMPIANS GROUP SEMINAR 21 November 2013 David Boyle Office of Surveyor-General Victoria

  10. The National Environment • Cadastral environment – currently jurisdictional • Digitally – C’wealthDept of Broadband, Communications and the Digital Economy • Office of Spatial Policy - policy unit – coordinating spatial data management, previously under GA • ANZLIC – Foundation Spatial Data Framework • ICSM – Cadastre 2034 (PCCR), Geodetic Datum (PCG) • Other jursidictions • Digital cadastres – 3dQLD (reliable Spatial Info) • Surveyors-General – NSW, SA, TAS, NT and NZ

  11. CHANGED REQUIREMENTS FOR CONNECTION TO MGA94 ISV GLENELG GRAMPIANS GROUP SEMINAR 21 November 2013 David Boyle (prepared by Eddie Cichocki) Office of Surveyor-General Victoria

  12. Spatial Accuracy of Map Base • Business Case (Dec 2011) • Five Options – Do nothing (100 years) – Resurvey the state ($425 NPV) – Back capture and update Vicmap ($95m NPV) – Imagery update of Vicmap ($6m NPV) – Mixed approach of back capture and imagery and build a new mapbase ($154 NPV) • Since December 2011 • Made available to the public • No commitment to/by government • ePlan • Other jurisdictions • Australian states • NZ – LINZ is being updated at a cost of $90m

  13. Main Changes • No longer required to provide MGA94 coordinates for PMs and PCMs connected to and the perimeter corners of the land under survey. • May need to connect to the datum • Introduction of terminology “SCN Mark” and “Non-SCN Mark” for PMs and PCMs in the SMES Database.

  14. Background • Requirement to coordinate cadastral surveys was introduced by the Survey Practice Circular 1995 which supported the Surveyors (Cadastral Surveys) Regulations 1995. • The Circular and Regulations also introduced the concept of Primary Cadastral Marks (PCMs) for the purpose of: • Monumenting cadastral surveys; and • Densifying the Survey Control Network. • In 2000, the Geocentric Datum of Australia 1994 was implemented and the Survey Practice Directive 2001 stated a preference for cadastral surveys to be coordinated on MGA94.

  15. Background cont. • Following the introduction of the Surveying (Cadastral Surveys) Regulations 2005, it was mandatory for MGA94 to be used as the datum for coordinating cadastral surveys. • The Surveyor-General of Victoria Practice Directives 2006 required the provision of MGA94 coordinates in the format of an Addendum to the Surveyor’s Report. • Since the introduction of the Addendum to the Surveyor’s Report, parcel corner coordinates have been captured and supplied to Logica for inclusion in Vicmap Property. • The purpose of providing coordinates for parcel corners was to update the state’s digital cadastral map base – Vicmap Property.

  16. Parcel Corner Coordinates - 2012 • Snapshot of the accuracy of Vicmap Property based on survey coordinates supplied in 2012.

  17. Reasons for Change • Business Case for a Spatially Accurate Map Base has recommended rebuilding the map base using survey observations rather than coordinates. • ePlan. • Non-homogeneity of PCM coordinates (static) and adjusted PM coordinates (semi-dynamic) in the SMES Database. • Resources in OSGV. • SMES 4 release in early 2014.

  18. SCN and Non-SCN Marks • The Survey Control Network (or “SCN”) is the network of survey marks in Victoria whose coordinates have been computed from a rigorous adjustment of observational data by OSGV. • An SCN Mark is a PM or PCM that has adjusted: • MGA94 coordinates – SCN GDA94 mark; or • AHD71 reduced level – SCN AHD mark; or • Both – SCN GDA94 & AHD mark. • A survey mark that does not have coordinates computed from a rigorous adjustment by OSGV is known as a “Non-SCN Mark” • Only SCN GDA94 marks are to be used for connecting cadastral surveys to MGA94 bearing and coordinate datum.

  19. Number of Marks in SMES • There are approximately 60500 marks in SMES that are available for connection of surveys to MGA94 (i.e. 4th Order or better). • When SMES 4 is released, approximately 25100 SCN GDA94 marks will be available for connection of surveys to MGA94. • This will result in a reduction of the number of surveys connecting to MGA94 datum. • The number of SCN GDA94 marks will gradually increase as observations to Non-SCN marks are incorporated into the adjustment. • The number of Non-SCN GDA94 marks will be approximately 162,000.

  20. Order and Uncertainty • Class and Order are the current indicators of precision for coordinates. • The new ICSM publication Standard of the Australian Survey Control Network – SP1 Version 2.0 will provide for the transition from Class and Order to uncertainty as the method of expressing the quality of coordinates. • Uncertainty means the doubt about the validity of a position (coordinates) and will be expressed as a standard deviation at the 95% confidence level. • Order will be phased-out of SMES over time and the only indicator of the precision of coordinates will be uncertainty.

  21. Positional Uncertainty • Any SCN GDA94 mark, regardless of its Order or uncertainty, will be able to be used for the connection of surveys to MGA94 datum.

  22. Connection to the Survey Control Network • Requirement contained in Regulation 11(1)(b), Surveying (Cadastral Surveys) Regulations 2005 and Regulation 14(2), Survey Co-ordination Regulations 2004 which require connection to at least two coordinated survey or permanent marks that are: • Properly verified as to position at the time of survey; • At least 200 metres apart; and • Within 500 metres(radius) of the survey or a greater distance from the survey if the connection can be made by establishing no more than three instrument points from each permanent mark. • Coordinated survey or permanent mark = SCN GDA94 mark.

  23. “Large” Subdivisions creating 10 lots or more • Connection to MGA94 is mandatory for “large” land subdivisions creating 10 lots or more. • Surveyors must: • Connect to at least two SCN GDA94 ground marks (or appropriate GNSS observation); and • Rotate the survey onto MGA94 bearing datum. • If insufficient SCN GDA94 ground marks are located in the vicinity of the survey, they will be established by OSGV upon application to the Manager, Geodetic Survey by email to smes.support@dtpli.vic.gov.au.

  24. Other Subdivisions and Surveys • For: • “Small” land subdivisions creating less than 10 lots; • Building subdivisions; • Application surveys under the Transfer of Land Act 1958; • Boundary Plans; and • Crown Surveys • The following rules apply depending on the availability of SCN GDA94 marks within the parameters of Regulation 14(2), Survey Co-ordination Regulations 2004.

  25. Two or More SCN GDA94 marks available (each within 500m radius) • Surveyors must: • Connect to at least two SCN GDA94 ground marks (or appropriate GNSS observation); and • Rotate the survey onto MGA94 bearing datum. SCN GDA94 MGA94 LUS SCN GDA94 SCN GDA94

  26. One SCN GDA94 mark available(within 500m radius) • Surveyors must: • Connect to that SCN GDA94 ground mark (or appropriate GNSS observation); and • Connect to at least one other PM or PCM to satisfy Regulation 11(3), Surveying (Cadastral Surveys) Regulations 2005; and • Adopt a bearing datum in accordance with title or a previous cadastral survey or plan. Non-SCN New PCM Unregistered PM LUS SCN GDA94

  27. No SCN GDA94 marks available • Surveyors must: • Connect to at least two PMs or PCMs to satisfy Regulation 11(3), Surveying (Cadastral Surveys) Regulations 2005; and • Adopt a bearing datum in accordance with title or a previous cadastral survey or plan. Non-SCN New PCM Unregistered PM LUS

  28. Previous connection to SCN GDA94 marks • A nearby earlier survey can be used for MGA94 bearing datum provided it: • Derived its MGA94 bearing datum from a connection to two SCN GDA94 ground marks; • Was performed by the same surveyor or survey firm; and • Was completed within the last five years. • In this case, surveyors must: • Connect to at least two PMs or PCMs from the earlier survey that are at least 200 metres apart; and • Rotate the survey onto MGA94 bearing datum.

  29. Permanent Marks • Where new PMs are established or existing unregistered PMs are found and connected to in a cadastral survey, surveyors must: • Obtain an allocated number for the PM using SMES; • Quote that number where appropriate on the survey documents; and • Prepare a PM Sketch Plan and lodge it with the Surveyor-General within one month; • Where new PCMs are established, surveyors must: • Assign a number to the PCM from the series of numbers pre-allocated to each licensed surveyor by the Surveyor-General; and • Quote that number where appropriate on the survey documents.

  30. Connection by Networked Real-time GNSS Observations • Verification of coordinates on at least one SCN GDA94 ground mark. Variation of horizontal component of the coordinate difference with SMES coordinates not to exceed 0.10m • Control points (PMs and PCMs) are to be established by at least two independent occupations separated by at least 20 minutes i.e. t2 - t1 > 20 min • Horizontal component of the differences of the control point positions, i.e. P2 - P1, must not exceed 0.05m SCN GDA94 Rover P1 (t1) P2 (t2) Rover Rover Networked Area

  31. MGA94 Bearing Datum by Real-time GNSS Observations • MGA94 bearing datum is to be derived from the independent occupations of two PMs or PCMs in the survey at least 200 metres apart. • Derived connection to SCN GDA94 ground mark used for verification purposes is to be shown on the Abstract of Field Records. Networked Area P1 (t1) P3 (t3) MGA94 Datum Line > 200m Rover Rover P4 (t4) P2 (t2) LUS Rover Rover

  32. Connection by Real-time GNSS Observations from a Single GPSnet Reference Station • Same procedure as for Networked Real-time GNSS Observations. • Distance from control point to GPSnet reference station not to exceed 20 kilometres. SCN GDA94 Rover GPSnet Reference Station < 20km P1 (t1) P2 (t2) Rover Rover

  33. Real Time Kinematic using Own Base Station • Where at least two SCN GDA94 ground marks are available, MGA94 datum is to be derived from a best-fit with the SMES coordinates of the PMs. • If insufficient SCN GDA94 ground marks exist in the vicinity, the survey may be placed on MGA94 bearing datum as derived from the GNSS observations. Rover Mean Shift SCN GDA94 PM Base SCN GDA94 PM Rover SCN GDA94 PM

  34. General Comments on GNSS • Surveyors must ensure they follow ‘best practice’ GNSS observation techniques. • Standards and Practices for Control Surveys (SP1) available at http://www.icsm.gov.au/geodesy/sp1.html • Provision will exist in SMES 4 for this data to be uploaded for inclusion in the network adjustment. • Licensed Surveyor’s Report to include details of the GNSS equipment and methodology used in the survey. • Also to include the comparison between GNSS and SMES coordinates of the SCN GDA94 mark as proof of verification.

  35. Summary • Cadastral surveys are no longer to be coordinated (effective as of today). • SMES 4 will designate survey marks as “SCN” and “Non-SCN” marks. • Only SCN GDA94 marks are to be used for connection of cadastral surveys to MGA94 bearing datum. • The quality of the coordinates of SCN marks will expressed as uncertainty. • All PMs and PCMs connected to in a survey are to be numbered. • Surveyors are encouraged (?urged) to connect to Non-SCN marks and unregistered PMs within the bounds of a survey. • Requirements for derivation of MGA94 bearing datum by GNSS observations remain practically unchanged.

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