GNSS coordinates definition
In certain circumstances new deposited plans may be prepared where the boundaries being surveyed are defined by co-ordinates derived using Global Navigation Satellite System(GNSS) techniques rather then the traditional method of ground survey from established marks and occupations. This method is especially useful in the case of large projects where the cost of a standard survey would be prohibitive or where the location is in an area where no survey marks are available. Examples include plans that define long stretches of road through Crown land (e.g. the Alpine Way through Kosciuszko National Park) or plans that define parcels in unsurveyed areas (eg Residential Settlement Leases in Lightning Ridge opal field).
These surveys will not comply with various clauses of the Surveying and Spatial Information Regulation 2012 (especially as regards the placement of pegs on corners), however, depending on the technique used, the MGA co-ordinates derived from GNSS surveying can be of high accuracy. Plans using MGA coordinates will be accepted in LPI provided they comply with the Surveyor General's Direction No.9 (GNSS Techniques).
Plans with boundaries determined by MGA co-ordinates, not ground survey, must meet the following requirements.
- An exemption to the placement of corner marks (and other necessary clause(s) of the Surveying and Spatial Information Regulation 2012) must be obtained from the Cadastral Management Unit, LPI Bathurst prior to lodgment of the plan.
- Boundaries shown in deposited plans may not be defined by co-ordinates unless a specific approval has been obtained from the Registrar General prior to lodgment of the plan. This approval will only be given when the survey is:
- of an extensive nature, and
- normal methods to define the boundaries would be impossible or impractical.
Further, where any new survey with boundaries and corners described by co-ordinates abuts an existing Torrens Title parcel, the common boundary must be fully surveyed to ensure that a consistent definition of that boundary is maintained between the two plans. MGA Co-ordinates are to be included for each re-established corner along the common boundary.
- Sufficient Survey Control Marks must be placed throughout the survey (at intervals and locations to comply with the Surveying and Spatial Information Regulation 2012) to adequately tie the co-ordinate survey into the overall cadastral grid. A surveyor, in the future, must be able to recreate the original reference framework from the Permanent Marks placed in the plan. In an extensive survey this may require the lodgment of an extra sheet detailing the control mark network used.
- A statement must be added to the plan setting out the survey technique adopted throughout the survey, e.g:
SURVEY TECHNIQUE USED 'DIFFERENTIAL GPS USING DUAL FREQUENCY RECEIVERS (or whatever) ' ACCURACY: CLASS 'B'
CO-ORDINATES BASED ON RTA CONTROL SURVEY USING GPS TECHNIQUES (specify the technique) TO AN ACCURACY OF CLASS 'B' SP1 VERSION 1.5
A schedule of the co-ordinates of every corner and every Permanent Mark (identified by an individual number) must be added to the plan. The schedule must include the type of mark placed (if applicable) and reference to the appropriate zone, accuracy and combined scale factor of the co-ordinates. A statement should be added to clearly indicate that the co-ordinates define the position of the corners.
CO-ORDINATES SHOWN ON THIS PLAN REPRESENT THE PARCEL CORNERS
An exemption must be sought from the Registrar General not to show boundary and connection bearings and distances (i.e. to refer to the use of co-ordinates only).
An appropriate statement should be added to the plan to indicate that the corners have not been marked pursuant to Clause 28 Surveying and Spatial Information Regulation 2012.
NOTE: CORNERS NOT MARKED
P - DENOTES CORNER MARKED WITH A STEEL STAR PICKET
Note Wherever corners are not marked, an exemption from the Surveying and Spatial Information Regulation 2012 must be obtained from Cadastral Management Unit, Bathurst.
Parcels limited in stratum must comply with Clauses 13 and 62 Surveying and Spatial Information Regulation 2012, with the usual benchmarks placed and referenced to AHD.
Note New certificates of title will issue on these plans in the normal manner. In general a Limitation notification will not be endorsed on the new titles, however, the Registrar General reserves the right to enter a Limitation notification where appropriate.