Geodetic On-Line Access (GOLA)

    Please provide marks status feedback via SLIP Geodetic portal button ...


      Mark Details (GOLA last updated on 30-Jun-2025)
      Download details of all points Frequently Asked Questions
      Download graphic summaries of all points

    View the graphic summary
    SSM     PERTH 261
    Alternate names : Map ref.: PERTH SH50-14
    APREF/NGCA codes: Database number : 100484
    Stamp name:      Date established :   01/01/1942
    Physical status : located (Dept of Land Admin.) Phys. status date :  20/03/2002
    Physical type :    brass plaqueHatch cover type : none
    Mark set in :        rockAccess type : 4 wheel drive
    Geographical CoordinatesMGA2020 Coordinates
    Horizontal datum : GDA2020Zone :             50
    Latitude :     S 31 14 33.14831Easting (m) :   391060.814
    Longitude :  E 115 51 21.59851Northing (m) :  6542953.775
    Convergence :       -0 35 36.27
    Point scale factor : 0.99974638
    Coordinate date :       13/08/2018
    Horizontal method :   GNSS Survey NetworkCadastral connection : Exists
    Relative horiz. accuracy :       15ppm ** Estimated relative uncertainty to adjacent marks
    Positional uncertainty (m) : 0.021 (95% Confidence level)
    Error Ellipse
    Semi-major axis (m) : 0.022
    Semi-minor axis (m) : 0.020
    Azimuth of semi-major axis (m) : 24 26 46
    Height Information
    Vertical datum :   AHD71Height type :          Orthometric
    Height (m) :         242.338Height date :          09/11/2001
    Established by :  Dept of Land Admin.State :                    Final
    Vertical method : Spirit LevellingVertical accuracy : 12rootK
    Derived GDA2020 ellipsoidal height (m) : 210.759N-Value (m) :          -31.579
    Geoid model :         AusGeoid2020
    ** Derived GDA2020 ellipsoidal height: h = H + N Interpolation :         Bi-Cubic
    Vertical datum :   GDA2020Height type :          Ellipsoidal
    Height (m) :         210.728Height date :          15/08/2018
    Established by :  Geoscience AustraliaState :                    Final
    Vertical method : GNSS Survey NetworkVertical accuracy : 0.037m
    Mark to hatch cover :  
    Mark to ground level : 
    RM Info** Warning: RM azimuths and coordinates are unverified
    ** Azimuth, distance and height difference are relative to main mark
    RM1 Phys. status : located (Scanlan Surveys Pty Ltd.) Date :   06/04/2001
    Phys. type :    star iron picketSet in : cairn
    Azimuth :           231 18 53Type :   True azimuth
    Distance (m) :    5.567Type :   Horizontal
    Height diff. (m) : -0.242Type :   Spirit Levelling
    RM to GL (m) :   None
    RM2 Phys. status : located (Scanlan Surveys Pty Ltd.) Date :   06/04/2001
    Phys. type :    brass rodSet in : rock
    Azimuth :           332 24 28Type :   True azimuth
    Distance (m) :    5.789Type :   Horizontal
    Height diff. (m) : NoneType :   
    RM to GL (m) :   None
    RM3 Phys. status : located (Scanlan Surveys Pty Ltd.) Date :   06/04/2001
    Phys. type :    bridge nailSet in : rock
    Azimuth :           64 10 43Type :   True azimuth
    Distance (m) :    5.464Type :   Horizontal
    Height diff. (m) : 0.345Type :   Spirit Levelling
    RM to GL (m) :   None
    RM Position Information** Warning: RM coordinates should be verified prior to use
    ** Coordinates are calculated from reference observations
    ** Coordinate accuracies commensurate with related observations
    RM1
    Geographical CoordinatesMGA2020 Coordinates
    Horizontal datum : GDA2020Zone :             50
    Latitude :     S 31 14 33.26129Easting (m) :   391056.505
    Longitude :  E 115 51 21.43429Northing (m) :  6542950.252
    Height Information
    Vertical datum :   AHD71
    Height (m) :         242.096
    RM2
    Geographical CoordinatesMGA2020 Coordinates
    Horizontal datum : GDA2020Zone :             50
    Latitude :     S 31 14 32.98172Easting (m) :   391058.080
    Longitude :  E 115 51 21.49718Northing (m) :  6542958.877
    Height Information
    Vertical datum :   
    Height (m) :         No height available
    RM3
    Geographical CoordinatesMGA2020 Coordinates
    Horizontal datum : GDA2020Zone :             50
    Latitude :     S 31 14 33.07103Easting (m) :   391065.706
    Longitude :  E 115 51 21.78438Northing (m) :  6542956.205
    Height Information
    Vertical datum :   AHD71
    Height (m) :         242.683
    Cadastral Connection Fieldbooks
    G 121
    Special Notes
    Unknown DateOld rock cairn (Boonanarring) is 32.03 metres from mark.
    24/05/2006Located within Trigonometrical Station Reserve 11915
    ATRF 2014
    GDA2020 coordinates are equivalent to ATRF2014@2020.0. ATRF2014 coordinates can be determined by application of the Australian Plate Motion Model. For general and technical information on GDA2020 see http://www.icsm.gov.au/gda2020 and ATRF2014 see http://www.icsm.gov.au/australian-terrestrial-reference-frame.
    View the graphic summary
    SSM     PERTH 261
    Alternate names : Map ref.: PERTH SH50-14
    APREF/NGCA codes: Database number : 100484
    Stamp name:      Date established :   01/01/1942
    Physical status : located (Dept of Land Admin.) Phys. status date :  20/03/2002
    Physical type :    brass plaqueHatch cover type : none
    Mark set in :        rockAccess type : 4 wheel drive
    Geographical CoordinatesMGA94 Coordinates
    Horizontal datum : GDA94Zone :             50
    Latitude :     S 31 14 33.19522Easting (m) :   391059.812
    Longitude :  E 115 51 21.56009Northing (m) :  6542952.320
    Convergence :       -0 35 36.29
    Point scale factor : 0.99974638
    Coordinate date :       05/05/2000
    Horizontal method :   Geodetic-TerrestrialCadastral connection : Exists
    Relative horiz. accuracy :       5ppm ** Estimated relative uncertainty to adjacent marks
    Positional uncertainty (m) : 0.031 (95% Confidence level)
    Error Ellipse
    Semi-major axis (m) : 0.033
    Semi-minor axis (m) : 0.029
    Azimuth of semi-major axis (m) : 35 0 0
    Height Information
    Vertical datum :   AHD71Height type :          Orthometric
    Height (m) :         242.338Height date :          09/11/2001
    Established by :  Dept of Land Admin.State :                    Final
    Vertical method : Spirit LevellingVertical accuracy : 12rootK
    Derived GDA94 ellipsoidal height (m) : 210.82N-Value (m) :          -31.518
    Geoid model :         AUSGeoid09 V1.01
    ** Derived GDA94 ellipsoidal height: h = H + N Interpolation :         Bi-Cubic
    Vertical datum :   GDA2020Height type :          Ellipsoidal
    Height (m) :         210.728Height date :          15/08/2018
    Established by :  Geoscience AustraliaState :                    Final
    Vertical method : GNSS Survey NetworkVertical accuracy : 0.037m
    Mark to hatch cover :  
    Mark to ground level : 
    RM Info** Warning: RM azimuths and coordinates are unverified
    ** Azimuth, distance and height difference are relative to main mark
    RM1 Phys. status : located (Scanlan Surveys Pty Ltd.) Date :   06/04/2001
    Phys. type :    star iron picketSet in : cairn
    Azimuth :           231 18 53Type :   True azimuth
    Distance (m) :    5.567Type :   Horizontal
    Height diff. (m) : -0.242Type :   Spirit Levelling
    RM to GL (m) :   None
    RM2 Phys. status : located (Scanlan Surveys Pty Ltd.) Date :   06/04/2001
    Phys. type :    brass rodSet in : rock
    Azimuth :           332 24 28Type :   True azimuth
    Distance (m) :    5.789Type :   Horizontal
    Height diff. (m) : NoneType :   
    RM to GL (m) :   None
    RM3 Phys. status : located (Scanlan Surveys Pty Ltd.) Date :   06/04/2001
    Phys. type :    bridge nailSet in : rock
    Azimuth :           64 10 43Type :   True azimuth
    Distance (m) :    5.464Type :   Horizontal
    Height diff. (m) : 0.345Type :   Spirit Levelling
    RM to GL (m) :   None
    RM Position Information** Warning: RM coordinates should be verified prior to use
    ** Coordinates are calculated from reference observations
    ** Coordinate accuracies commensurate with related observations
    RM1
    Geographical CoordinatesMGA94 Coordinates
    Horizontal datum : GDA94Zone :             50
    Latitude :     S 31 14 33.30820Easting (m) :   391055.504
    Longitude :  E 115 51 21.39587Northing (m) :  6542948.797
    Height Information
    Vertical datum :   AHD71
    Height (m) :         242.096
    RM2
    Geographical CoordinatesMGA94 Coordinates
    Horizontal datum : GDA94Zone :             50
    Latitude :     S 31 14 33.02863Easting (m) :   391057.079
    Longitude :  E 115 51 21.45876Northing (m) :  6542957.422
    Height Information
    Vertical datum :   
    Height (m) :         No height available
    RM3
    Geographical CoordinatesMGA94 Coordinates
    Horizontal datum : GDA94Zone :             50
    Latitude :     S 31 14 33.11795Easting (m) :   391064.704
    Longitude :  E 115 51 21.74596Northing (m) :  6542954.751
    Height Information
    Vertical datum :   AHD71
    Height (m) :         242.683
    Cadastral Connection Fieldbooks
    G 121
    Special Notes
    Unknown DateOld rock cairn (Boonanarring) is 32.03 metres from mark.
    24/05/2006Located within Trigonometrical Station Reserve 11915