The following information relates to rule 7.5 and the naming of survey marks.
The cadastre is being continually updated by the integration of new cadastral survey datasets and the introduction of more and more survey marks. It is essential that survey marks that relate to particular points are able to be identified and not confused with other marks.
All new non-boundary survey marks and points must be given unique names [r 7.5(a)]. These include new PRMs, new witness marks, and other new non-boundary marks (including traverse marks or unmarked points included in the CSD).
Note, new boundary points and boundary marks are not required to be given unique names although surveyors may do so for referencing purposes.
The name must be described by the use of three components in the following sequence [r 7.5(b)]:
- Physical mark type which may be abbreviated, for example ‘IT’ for iron tube
- Unique alpha-numeric identifier, for example ‘1’. Note, the same alpha-numeric identifier cannot be used for more than one new mark on the same CSD (eg there cannot be a new IT 1 and a new IS 1)
- Type and number of the CSD, for example ‘DP 405689’
Rule 7.5(a) requiring a unique name for non-boundary marks applies only to new marks.
If an existing non-boundary mark or boundary point does not have a unique name, a unique identifier may be added in brackets before the CSD reference. For example, marks adopted from DP 7700 could become IT (1) DP 7700 and UNMK (2) DP 7700. This unique name will then be used on future CSDs to comply with rule 9.6.2(d)(ii), unless there are duplicate names, in which case the identifier may be changed to make it unique.
If additional information is to be added to a mark for the benefit of future users (eg a geodetic code), it must be clear that this information is not part of the mark name. One way of ensuring this is to add the information under the mark name in brackets.
An undisturbed old non-boundary or boundary mark must retain its existing name [r 7.5(c)] including the physical mark type, unique identifier (if it has one), and the CSD source type and number.