Description: This provides a polygon coastline and islands layer which is based on the Topo50products. It is a combination of the following layers:- [NZ Coastlines (Topo1:50k)](http://data.linz.govt.nz/layer/258-nz-coastlines-topo-150k/)- [NZ Island Polygons (Topo1:50k)](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 andChatham Islands areas (i.e. islands in lakes, rivers and estuaries) have beenremoved.The GIS workflow to create the layer is: 1. NZ Coastlines were converted from a polyline to a polygon using a polyline topolygon tool.2. The resulting coastal polygon was then used as an input into an erase tooland run against the NZ Island Polygon layer to remove all islands lying withinthe 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 IsIsland Polygons (Topo, 1:50k), NZ Campbell Is / Motu Ihupuku Island, NZAntipodes 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 Lagoonfrom the NZ Chatham Is lagoon polygons (Topo, 1:50k) layer were then erased fromthe resultant polygon layer to include these two water bodies in the coastlinedefinition.