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Māori land blocks vs parcels

Mapping Māori land requires understanding that Māori land blocks, titles, and ownership structures do not align neatly with the parcel based cadastre most GIS users are trained on. Confusing blocks with parcels is a common source of error and can lead to incorrect analysis, misrepresentation of whenua, and loss of trust with landowners. This page explains the differences, common pitfalls, and practical checks for working with Māori land spatial data, with guidance suited to iwi, hapū, whānau, and practitioners supporting them.

Core concepts to understand​

Parcels in the LINZ cadastre​

The standard cadastral layer represents land as parcels.

  • parcels are legal survey units
  • each parcel has a unique identifier
  • parcels align to survey plans, not ownership structure
  • parcels change as surveys update, subdivisions occur, or boundaries are redefined Parcels answer the question, where is the surveyed boundary today.

Māori land blocks​

Māori land blocks are legal and cultural land units defined through the Māori Land Court.

  • blocks may contain one or many parcels
  • a block boundary may follow historical descriptions rather than modern survey lines
  • blocks often persist even when parcels inside them change
  • block names carry whakapapa, history, and meaning Blocks answer the question, what land is held under Māori land tenure and how it is recognised by the Court.

Titles and ownership​

Māori land titles are issued by the Māori Land Court.

  • titles sit over blocks, not parcels
  • ownership is usually shared, sometimes across hundreds of owners
  • ownership interests are not spatially subdivided
  • succession changes ownership but not block geometry Never assume a parcel equals a title or an owner.

Why parcels and blocks do not match​

Several historical processes explain the mismatch:

  • original block boundaries were described before modern surveying
  • later surveys cut parcels across earlier block extents
  • public works, roads, and waterways fragmented parcels but not titles
  • some blocks were partially alienated, leaving remnant Māori land The result is overlapping layers that represent different legal realities.

Common pitfalls when mapping Māori land​

  • treating a parcel layer as a Māori land map
  • dissolving parcels to create a block shape without legal reference
  • assuming parcel ownership fields describe Māori ownership
  • clipping analysis to parcels and losing block context
  • publishing parcel maps without explaining their limits These mistakes can undermine trust quickly.

Māori Land Court spatial data​

Māori Land Court spatial datasets are the most appropriate starting point for Māori land mapping.

  • blocks represent recognised Māori land units
  • attributes link to block name and status
  • boundaries are indicative, not survey accurate These datasets should always be accompanied by an accuracy statement.

Downloading Māori Land Court spatial data via Te Puni Kōkiri​

publishes Māori Land Court spatial data through its open data channels. Typical workflow: 1. Locate the Māori Land Court spatial dataset in the TPK open data portal. 2. Download the spatial layer in a GIS friendly format. 3. Review metadata carefully before use. 4. Load alongside LINZ parcels for comparison, not replacement. Important notes:

  • block boundaries are approximate
  • use for context and planning, not legal definition
  • always confirm with the Māori Land Court or block trustees for decisions

When working with both systems: 1. Māori Land Court blocks 2. Modern aerial imagery 3. LINZ cadastral parcels 4. Supporting layers such as roads and waterways This keeps the Māori land context visible while still allowing parcel level interpretation.

Practical checks before using the data​

Before analysis or publication, run these checks.

Geometry checks​

  • confirm coordinate system is correct
  • check for gaps or overlaps within blocks
  • compare block extents against imagery for obvious misalignment

Attribute checks​

  • confirm block names are present and correctly spelled
  • check land status fields
  • avoid using parcel ownership fields as Māori ownership indicators

Context checks​

  • ask what question the map is answering
  • confirm the scale is appropriate
  • identify whether parcel detail adds value or confusion If parcel detail does not add value, remove it.

Explaining maps to Māori audiences​

When sharing maps:

  • clearly state whether you are showing blocks or parcels
  • explain why both layers may appear
  • avoid technical cadastral language where possible
  • use block names prominently Maps should support kōrero, not replace it.

Use cases where block based mapping is preferred​

  • land trust planning
  • succession and governance discussions
  • cultural mapping
  • strategic land use conversations
  • Treaty and historical context work Parcel based mapping is more suitable for infrastructure, consenting, or engineering discussions, and even then should be contextualised.

Tikanga and data responsibility​

Māori land data carries responsibility.

  • do not publish block maps without permission
  • avoid implying ownership certainty where none exists
  • store data securely
  • record who approved its use and for what purpose Respecting whenua includes respecting how it is represented.

A simple decision guide​

If you are unsure which layer to use:

  • start with Māori Land Court blocks
  • add parcels only if the kaupapa requires it
  • explain the relationship clearly
  • document limits and assumptions Understanding the difference between blocks, parcels, and titles is foundational for Māori GIS work. Getting this right early prevents technical errors and supports respectful, accurate mapping of whenua.