A structure used for the storage of fluids Data Dictionary for tank_pnt: https://docs.topo.linz.govt.nz/data-dictionary/tdd-class-tank_pnt.html This layer is a component of the Ant50 map series. This is the topographic mapping carried out at 1:50,000 scale by LINZ within the Ross Dependency, Antarctica.

Ice stream; a current of ice in an ice sheet or ice cap that flows more rapidly than the surrounding ice,usually flowing to the ocean or to an ice shelf and not constrained by exposed rock. Data Dictionary for ice_stream_cl: http://apps.linz.govt.nz/topo-data-dictionary/index.aspx?page=class-ice_stream_cl This layer is a component of the Ant50 map series. This is the topographic mapping carried out at 1:50,000 scale by LINZ within the Ross Dependency, Antarctica.

An area set aside for the landing of helicopters Data Dictionary for helipad_pnt: https://docs.topo.linz.govt.nz/data-dictionary/tdd-class-helipad_pnt.html This layer is a component of the Ant50 map series. This is the topographic mapping carried out at 1:50,000 scale by LINZ within the Ross Dependency, Antarctica.

A crack or fissure in a glacier resulting from stress; may be 20m wide and 45 metres deep and several hundred metres long. Data Dictionary for crevasse_cl: https://docs.topo.linz.govt.nz/data-dictionary/tdd-class-crevasse_cl.html This layer is a component of the Ant50 map series. This is the topographic mapping carried out at 1:50,000 scale by LINZ within the Ross Dependency, Antarctica.

This provides a polygon coastline and islands layer which is based on the Topo500 products. It is a combination of the following layers: - [NZ Coastlines (Topo, 1:500k)](http://data.linz.govt.nz/layer/50204-nz-coastlines-topo-1500k/) - [NZ Island Polygons (Topo, 1:500k)](http://data.linz.govt.nz/layer/50211-nz-island-polygons-topo-1500k/) This topographic coastline is the line forming the boundary between the land and sea, defined by mean high water. Islands from the NZ Island Polygons layer that lie within the NZ Coastline area (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. For more detailed description of each layer refer to the layer urls above.

The line forming the boundary between the land and sea, defined by mean high water. Data Dictionary for coastline: http://apps.linz.govt.nz/topo-data-dictionary/index.aspx?page=class-coastline This layer is a component of the Ant50 map series. This is the topographic mapping carried out at 1:50,000 scale by LINZ within the Ross Dependency, Antarctica.

A naturally formed, subterranean open area or chamber. Data Dictionary for cave_pnt: https://docs.topo.linz.govt.nz/data-dictionary/tdd-class-cave_pnt.html This layer is a component of the Ant50 map series. This is the topographic mapping carried out at 1:50,000 scale by LINZ within the Ross Dependency, Antarctica.

Disturbed ice area edge; designated where the presence of seracs, criss-crossed crevasses and skauk are in such numerous quantities that is is difficult to separate one ice formation from another. Data Dictionary for distice_poly: http://apps.linz.govt.nz/topo-data-dictionary/index.aspx?page=class-distice_poly This layer is a component of the Ant50 map series. This is the topographic mapping carried out at 1:50,000 scale by LINZ within the Ross Dependency, Antarctica.

A region of permanent ice Data Dictionary for ice_poly: https://docs.topo.linz.govt.nz/data-dictionary/tdd-class-ice_poly.html This layer is a component of the Ant50 map series. This is the topographic mapping carried out at 1:50,000 scale by LINZ within the Ross Dependency, Antarctica.

A place where some historic activity has been conducted, or where some historic object is located. Data Dictionary for historic_site_pnt: http://apps.linz.govt.nz/topo-data-dictionary/index.aspx?page=class-historic_site_pnt This layer is a component of the Ant50 map series. This is the topographic mapping carried out at 1:50,000 scale by LINZ within the Ross Dependency, Antarctica.