Adopted Traverses - Accuracy Requirements

A new Ruling LINZR65312 exempts most adopted non-boundary marks from having to meet the accuracy standards in rule 3.1(b). Poor quality adoptions, such as very old centreline traverses, have been failing the related validation tests in Landonline and causing problems for surveyors. This Ruling means that those adopted vectors can be included in a CSD and not breach the standards.

The exemption does not apply to adopted cadastral survey network marks. Rule 4.2 requires connection to cadastral survey network marks where the specified distance criteria are met. The accuracy standard in rule 3.1(b) continues to apply to that connection, even where the connection includes adopted vectors. If such adoptions are not sufficiently accurate, an alternative connection may be required.

The exemption does not affect the accuracy standards between adopted boundary points which continue to apply.

The pre-validation tests in Landonline will be changed so that these marks will no longer be tested for compliance with this standard.

In the meantime, pre-validation reports of adopted non-boundary marks that fail the relative accuracy test for rule 3.1(b) and are covered by this exemption can be ignored. Any such marks are listed under the heading Rule 3.1(b): Relative accuracy between non-boundary marks including adopted marks. Note that some listed failures may be between new, old and adopted cadastral survey network marks, to which the exemption does not apply.

However surveyors should still consider marks that fail the misclose test for rule 3.1(b). Any such marks are listed under the heading Rule 3.7 and Rule 3.1(b): Misclose of observations between all new and old non-boundary marks including adopted marks.

As with the relative accuracy test, some listed failures may be between new, old and adopted cadastral survey network marks, to which the exemption does not apply. Even, where the exemption does apply, a failure indicates that the captured vectors to affected points do not fit very well. While this may be expected, such as in the case of a very old traverse, it may also indicate a capture error. It would be helpful to include an explanation of the accepted failures in the Survey Report.