OSG Submission of PSMs coordinates


Submission of PSMs coordinates

Notice of the Surveyor-General No 4, requires Surveyors to determine Permanent Survey Marks (PSMs) coordinates and provide them to the Surveyor-General under the following circumstances:

  1. Placed PSMs: Surveyors must determine and provide MGA2020 coordinates and a Positional Uncertainties (PUs) for all newly placed PSMs.
  2. Existing PSMs: For existing PSMs connected to that either lack a PU or possess a PU greater than or equal to 0.10m Survey Mark Database should be referenced for current PU status.
  3. Existing PSMs with differing coordinates: Surveyors finding coordinates differences regarding existing PSMs on surveys lodged with Land Services SA must report the discrepancies to the Surveyor-General, and provide updated coordinates for the survey mark. The tolerances are set by the Surveyor-General in the Notice of the Surveyor-General No 1 (item 1.2.4, Differences to Published Coordinates of Permanent Survey Marks).

Note: PSM coordinates identified with a 'Type B PU' attribute are exempt from requiring re-coordination, as their coordinates are expected to be dynamic due to external factors such as reactive soil. These PSMs are not integrated into the state geodetic network and are instead included in the database as isolated, or unadjusted coordinates.

The provision of coordinates to the Surveyor-General shall be undertaken in accordance with Section 2 of the Cadastral Survey Guidelines.

To submit PSMs coordinates, complete the provision of PSM coordinates form and the provision of PSM coordinates spreadsheet provided by the Surveyor-General:

Provision of PSM coordinates spreadsheet
Download XLSX | 73 KB

To complete the spreadsheet, surveyors need to complete the following:

  1. PSM number
  2. Mark type
  3. Determined coordinates
  4. Date of the observations
  5. Primary control method (which refers to the method in which the base was determined, e.g. AUSPOS or Static)
  6. Primary horizontal PU (enter the existing PU value for PSM in the Survey Database or AUSPOS report)
  7. PSM coordination method (which refers to the method used to determine the baseline between the PSM and base). Once the PSM coordination method is chosen the derived PU is calculated automatically.

Surveyors must ensure that the combination of the PU of the control and coordination method which results in a PU higher than satisfies the requirement for the area (see Cadastral Survey Guidelines, Section 2.5.a). This can be tested prior to fieldwork using the spreadsheet.

We acknowledge and respect Aboriginal peoples as the state's first peoples and nations, and recognise them as traditional owners and occupants of land and waters in South Australia. Further, we acknowledge that the spiritual, social, cultural and economic practices of Aboriginal peoples come from their traditional lands and waters, that they maintain their cultural and heritage beliefs, languages and laws which are of ongoing importance, and that they have made and continue to make a unique and irreplaceable contribution to the state. We acknowledge that Aboriginal peoples have endured past injustice and dispossession of their traditional lands and waters.