Some cadastral survey network (CSN) marks are near a busy road, at the top of a mountain, far away, or damaged by construction, earthquake or landslide. If this makes them unsafe or impractical to occupy, it may be more practical to create a CSN using PositioNZ-PP to connect to New Zealand Geodetic Datum 2000 (NZGD2000).
There may be additional requirements if you require:
- multiple CSN marks
- a connection to New Zealand Vertical Datum 2016 (NZVD2016)
- an accuracy higher than Order 6. See Coordinate Orders.
Contact CRM_Geodetic@linz.govt.nz to find out more before you start the survey.
For a mark to be assigned Order 6 in Landonline
If you want the mark to be assigned Order 6, you will need:
- a new or existing mark that meets the requirements of a permanent reference mark (PRM)
- 2 independent GNSS occupations on that mark (including a change in antenna height), each of at least 1-hour duration
- measured antenna heights for each occupation, reduced to a vertical distance between the top of the mark and bottom of antenna (heights are not generally required for cadastral surveys, but PositionNZ-PP data is 3-dimensional)
- horizontal agreement of better than 0.15m between the 2 independent occupations after processing in PositioNZ-PP vertical agreement of better than 0.20m between the 2 independent occupations after processing in PositioNZ-PP.
Sending us the data
Once PositioNZ-PP has processed the data, 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 (for example, iron tube down 0.10m at side of driveway).
- If the mark is existing, supply its current name. If the mark is new, suggest an appropriate name for the mark based on a geographical identifier, such as 57 SMITH ROAD (where 57 is the RAPID number of the nearest address). Do not suggest a CSD reference, since the CSD has not yet been approved.
We will add the data to Landonline and generate the new coordinate within 2 working days.