PositioNZ-PP can be used to generate Order 6 Cadastral Survey Network (CSN) marks, which LINZ can add to Landonline in advance of a Cadastral Survey Dataset (CSD) being submitted.
This is an efficient way of getting connected to the datum in areas where there are no nearby geodetic or CSN marks.
For a mark to be assigned Order 6 in Landonline, you will need:
- A new or existing mark that meets the requirements of a Permanent Reference Mark (PRM)
- Two independent GNSS occupations on that mark (including a change in antenna height), each of at least one hour duration
- Measured antenna heights for each occupation, reduced to a vertical distance between the top of the mark and bottom of antenna (while heights are not generally required for cadastral surveys, the PositionNZ-PP data is three-dimensional, hence accurate antenna heights are required)
- Horizontal agreement between the two independent occupations after processing in PositioNZ-PP of better than 0.15m
- Vertical agreement between the two independent occupations after processing in PositioNZ-PP of better than 0.20m
Once PositioNZ-PP has processed the data, please send the following to CRM_Geodetic@linz.govt.nz:
- The zip file containing the results of the PositioNZ-PP processing
- A brief description of the mark (eg Iron tube down 0.10m at side of driveway)
- If the mark is new, an appropriate name for the mark. This should be based on a geographical identifier, such as SMITH ROAD (where 57 is the RAPID number of the nearest address) rather than a CSD reference, since the CSD has not yet been approved
- If the mark is existing, the current name of the mark
LINZ will add the data to Landonline and generate the Order 6 coordinate within two working days.
If multiple CSN marks are required, or an Order 3V vertical control mark is required, please contact CRM_Geodetic@linz.govt.nz before doing the survey as there may be additional requirements (eg longer occupations) to ensure accuracy standards are met.