Risk-based acceptance framework for Cadastral Survey Datasets (CSDs)
Update January 2012
In 2012, LINZ will be undertaking the first complete review of surveyor profiles since their introduction as part of the risk-based acceptance process in 2008.
This review will only be looking at the surveyor profile component of the risk assessment.
See January's Landwrap article for further information.
Background
LINZ developed and implemented a new risk-based acceptance framework in 2008.
This framework underpins a cadastral survey validation process that supports a wider initiative based on a first time compliance model that aligns with our goals of Optimal Regulation – 'As little as possible, as much as necessary' and e-Delivery excellence.
Current assurance environment
The survey system as a whole functions within a regulatory controlled environment that provides assurance of compliance at several levels. Within the end-to-end process, there is duplication of compliance effort by both surveyors and LINZ in assessing the quality of every cadastral survey dataset (CSD) and determining compliance before integration into the cadastre. Therefore, given this duplication, past levels of LINZ validation effort have not accurately and appropriately reflected the risks associated with each lodged dataset. Nor has the validation process always consistently reflected the gains and advantages available from a world class automated e-survey processing system, especially with 100% e-lodgement.
Objective of the framework
The objective is for LINZ to achieve consistency, effectiveness and greater efficiency by better utilising the automated Landonline tools when processing CSDs. The new process will make better use of resources by aligning LINZ's validation analysis to the risk profile of each dataset.
Risk-based acceptance framework
The framework is based on an assessment matrix comprising two primary elements – the surveyor's profile and the dataset's complexity. Together, these two profiles define the dataset risk profile.
The desired LINZ validation effort, to apply to each dataset being processed, is codified against this dataset risk profile. The following diagram and profile descriptions summarise the framework.
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Parameters used in calculating the Surveyor Profile
- Number of CSDs submitted: <10, >24, other
- Number of both significant and critical requisitions per CSD: >1, <0.15, other
- Number of critical requisitions per CSD: >0.04, = 0, other
Criteria to be used in calculating the Dataset Complexity Profile
The following is the current criteria to guide surveyors in determining the complexity profile of each dataset lodged. The Dataset Profile Lodgement form can be downloaded here
| Profile | Dataset Complexity Criteria – to determine Dataset Complexity Profile |
|---|---|
| Low | Parent parcels have been previously captured into Landonline and this survey definition confirms no conflict with Landonline data (ie no material changes to existing title dimensions) |
| More than 50% of the marks have SDC status (approximate) view Landonline spatial layer Marks NZGD 2000-SDC | |
| Datasets with no new primary parcel boundaries | |
| SO Re-instatement CSD includes Monumentation CSD (High if title is limited as to parcels) | |
| SO Survey Information | |
| Flats/Cross Lease (incl. permanent structure boundaries) | |
| Medium | Less than 50% of marks have SDC status (approximate) view Landonline spatial layer Marks NZGD 2000-SDC) |
| Datasets with new primary parcel boundaries but no new field work | |
| Datasets with non-primary Lease parcels | |
| Complex easements | |
| Standard unit developments | |
| Dataset subject to a specific Surveyor-General’s Ruling | |
| Adopted information not matching source includes bearing adjustments | |
| Other – surveyor to describe | |
| High | Parent parcel title dimensions (or other conflicts) materially different from cadastral record |
| Staged or Layered Unit Developments, or Unit Redevelopments | |
| Strata parcels | |
| Water & irregular boundaries | |
| Parcels with Class D Accepted boundaries | |
| Land being brought under the Land Transfer Act | |
| Crown subdivision | |
| Maori land surveys | |
| Multiple Pt lots with same lot number | |
| Titles limited as to parcels or interim titles | |
| Parent parcel includes Diagrams on Transfer | |
| Unexpected discrepancies when defining a boundary by survey | |
| Known areas of ground movement (eg Edgecumbe, Moeraki, Bisley Ave Nelson & Canterbury) | |
| Very old surveys (pre 1930) supporting guaranteed titles – where the record is poor | |
| Dataset requires additional Surveyor-General statutory approval | |
| Other – surveyor to describe |
Quality assurance of the new framework and validation process
LINZ will analyse a percentage of validated datasets to ensure the new acceptance process is robust and the surveyor and dataset complexity profiles are correct. The results of this analysis will also provide an opportunity for LINZ to routinely assess and refine the framework and validation process.
