Pelagic_productivity_ORC (MapServer)

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Service Description:

This provides a polygon coastline and islands layer which is based on the Topo50

products. It is a combination of the following layers:

- [NZ Coastlines (Topo

1:50k)](http://data.linz.govt.nz/layer/258-nz-coastlines-topo-150k/)

- [NZ Island Polygons (Topo

1:50k)](http://data.linz.govt.nz/layer/288-nz-island-polygons-topo-150k/)

- [NZ Auckland Is Island Polygons (Topo,

1:50k)](http://data.linz.govt.nz/layer/959-nz-auckland-is-island-polygons-topo-150k/)

- [NZ Campbell Is / Motu Ihupuku Island Polygons (Topo,

1:50k)](http://data.linz.govt.nz/layer/932-nz-campbell-is-motu-ihupuku-island-polygons-topo-150k/)

- [NZ Antipodes Is Island Polygons (Topo,

1:25k)](http://data.linz.govt.nz/layer/978-nz-antipodes-is-island-polygons-topo-125k/)

- [NZ Kermadec Is Island Polygons (Topo,

1:25k)](http://data.linz.govt.nz/layer/908-nz-kermadec-is-island-polygons-topo-125k/)

- [NZ Bounty Is Island Polygons (Topo,

1:25k)](http://data.linz.govt.nz/layer/992-nz-bounty-is-island-polygons-topo-125k/)

- [NZ Snares Is / Tini Heke Island Polygons (Topo,

1:25k)](http://data.linz.govt.nz/layer/893-nz-snares-is-tini-heke-island-polygons-topo-125k/)

- [NZ Chatham Is island polygons (Topo,

1:50k)](http://data.linz.govt.nz/layer/86-nz-chatham-is-island-polygons-topo-150k/)

Islands from the NZ Island Polygons layer that lie within the NZ Coastline and

Chatham Islands areas (i.e. islands in lakes, rivers and estuaries) have been

removed.

The GIS workflow to create the layer is:

1. NZ Coastlines were converted from a polyline to a polygon using a polyline to

polygon tool.

2. The resulting coastal polygon was then used as an input into an erase tool

and run against the NZ Island Polygon layer to remove all islands lying within

the NZ Mainland and Stewart Island.

3. This was then merged with the NZ Chatham Is island polygons (Topo, 1:50k)

that have had the islands within the main island polygon removed, NZ Auckland Is

Island Polygons (Topo, 1:50k), NZ Campbell Is / Motu Ihupuku Island, NZ

Antipodes Is Island Polygons (Topo, 1:25k), NZ Kermadec Is Island Polygons

(Topo, 1:25k), NZ Bounty Is Island Polygons (Topo, 1:25k) and NZ Snares Is /

Tini Heke Island Polygons (Topo, 1:25k) layers using a merge tool.

4. Lake Onoke from the NZ Lake Polygons (Topo 1:50k) layer and Te Whanga Lagoon

from the NZ Chatham Is lagoon polygons (Topo, 1:50k) layer were then erased from

the resultant polygon layer to include these two water bodies in the coastline

definition.

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