Use this process to record an old mark that has been affected by ground movement, but has not been determined as disturbed or undisturbed, and is not being used to define a boundary (See rule 18.3 of the Rules for Cadastral Survey 2010).

You must not include unproven marks in CSDs where survey marks and parcel boundaries have not been affected by ground movement.

Treat old marks that have been previously captured as unproven and are to be used as evidence for re-establishing a boundary as either reliable or disturbed.

Advice for different capture scenarios is listed below:

New Unproven Boundary, Non-boundary or Geodetic Mark

If you locate an old survey mark that is not determined as disturbed or undisturbed and is not being used to re-establish a boundary, capture it as an unproven mark.

Do not capture adoptions indicating that the unproven mark is not in its original position.

Enter the fields in Mark Details:

  • Mark Name: Existing mark name (Mark Type Abbrev, Mark No, Mark Plan Ref)
  • Mark Plan Ref: add the suffix ‘(UNPROVEN)’ after CSD number
  • Mark State: Old
  • Mark Purpose: Non-boundary, PRM, Witness, etc for non-boundary mark; or ‘defined by survey’ for boundary mark

    Do not link the unproven mark to an existing mark node.

Unproven mark found and proven to be disturbed

If you find an old survey mark that was labelled ‘Unproven’ on a prior CSD, and prove this to be disturbed, capture it as a disturbed mark.

Do not label it as ‘Unproven’. See Capturing Disturbed Marks (see related content below)

Finding unproven marks that prove to be reliable

If you find an old survey mark that was labelled ‘Unproven’ on a prior CSD, and it proves reliable on a subsequent survey:

  1. Capture the mark with its original mark name.
  2. Remove the suffix ‘Unproven’ from the Mark Plan Reference.

If you find an old geodetic mark that was labelled ‘Unproven’ on a prior CSD, and it proves to be reliable, submit a request to the National Geodetic Office for the mark name to be amended:

  1. Search for the geodetic mark in the Geodetic Database (see Related External Content below)
  2. Select User feedback/unproven status under the header ‘Detailed Information’
  3. Select Submit feedback on this mark
  4. Complete the feedback fields and select Submit feedback

Linking the nodes

If only one node exists in Landonline, you must link to it. If both the unproven and original nodes exist in Landonline, link to the original node and report this in section 17 Survey System Maintenance of the Survey Report Template Guide (see related content below) requesting that the nodes be merged.

Finding unproven marks that are to be retained

If you find an old survey mark that was labelled ‘Unproven’ on a prior CSD and it is to remain unproven, link it to its existing unproven node in Landonline.

Do not capture adoptions indicating that the unproven mark is not in its original position.

Adopting unproven survey marks

If it is necessary to adopt an unproven survey mark as well as adopting the original position of the mark:

  1. Capture both marks.
  2. Retain their respective names with reference in the Mark Description field to ‘As adopted from …’ / ‘As found on …’.

    Until a mark is found and proved to be disturbed, it cannot be treated or labelled as a disturbed mark.
  3. Link the original adopted position to its existing original mark node, if available in Landonline.
  4. Link the adopted unproven mark to its existing unproven mark node.

    If the unproven mark has already been linked to the original adopted node, link to this node and report this in section 17 Survey System Maintenance of the Survey Report Template Guide (see related content below).

Removing the ‘Unproven’ status

When an old unproven mark is deemed reliable or disturbed, you need to remove the unproven status and treat the mark according to its new determination.

When an unproven mark is subsequently proven to be reliable, it must remain proven unless further ground movement or disturbance occurs.

To be considered unproven, an old survey mark must have been affected by ground movement.

Mark Protection and 5th Order Geodetic Mark Surveys

A minimum of two reliable survey marks are required to be linked in Landonline for you to submit your survey.

Want to know more about capturing marks? See related content below.