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The land/water demarcation classification

There is a separate classification to identify land and water meshblocks. Every meshblock must be classified as either land or water. Note that some historic meshblocks had a classification of 'other', where the meshblock consisted of both land and water.

Land/water demarcation classification:

  • 1 – Land
    • 11 – Island
    • 12 – Mainland
  • 2 – Water
    • 21 – Inland water
    • 22 – Inlet
    • 23 – Oceanic

1 – Land meshblocks

Land meshblocks are meshblocks that have been classified as island or mainland meshblocks.

11 – Island meshblocks

Island meshblocks are meshblocks containing islands that are near to the shore but not linked to a mainland meshblock.

In an effort to separate land from water, the majority of islands, or groups of islands, have now been digitised and assigned a meshblock, regardless of whether they are named or populated.

12 – Mainland meshblocks

Mainland meshblocks are meshblocks containing either land-only areas, or land/water areas where the water area:

  • has not been defined as an inland water meshblock
  • is not generally used for shipping activity, and/or
  • cannot be easily separated from the land-based meshblock (eg small lakes or rivers where the meshblock boundary runs down the centre of the river).

The mainland meshblocks exclude islands (unless they are close to the coast, in which case they may be hooked to a mainland meshblock), but may include some inlet and oceanic areas.

2 – Water meshblocks

Water meshblocks are meshblocks that have been classified as inland water, inlet, or oceanic meshblocks.

21 – Inland water meshblocks

Inland water meshblocks are meshblocks containing lakes and rivers where the meshblock is water only. When separating lakes from land the following guidelines apply:

  • All lakes greater than or equal to 9km2 must be separated from land.
  • If the lake is less than 9km2 and it is used for business or recreational purposes, or people are living on the lake, then the land and water must be separated into separate meshblocks.
  • If the lake is less than 9km2 in size and is not used for business or recreational purposes, or there are no people living on the lake, then the lake can be incorporated into the mainland meshblock.

22 – Inlet meshblocks

Inlet meshblocks are meshblocks containing inlets, bays, coastal harbours, ports, lagoons, or estuaries where the meshblock is water only.

23 – Oceanic meshblocks

Oceanic meshblocks are meshblocks including the area from the mean high water mark or the mean low water springs (depending on the territorial authority) to the extent of the 200 mile EEZ, excluding inlet meshblocks and island meshblocks. Note that meshblock geographic units are only digitised to the 12 mile limit.

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