Topographic Layers

The Topo50 map series provides topographic mapping for the New Zealand mainland, the Chatham Islands, and offshore islands at 1:50,000 scale.

Along with the paper-based Topo50 map series, digital images of the maps are also publicly available.

Georeferenced raster digital images are provided at a resolution of 300 DPI. Georeferencing allows adjacent maps to be accurately and automatically aligned within GIS systems.

For more information, and a description of the georeferencing keys:
www.linz.govt.nz/topography/topo-maps/topo50/digit...

Please be aware of the following:

• The existence of a road or track does not necessarily indicate public right of access.
  

• Closed tracks are defined as being no longer maintained or passable and should not be used by recreationalists. The Department of Conservation or other authorities should be contacted for the latest information on tracks and huts.
  

• Not all aerial wires, cableways and obstructions that could be hazardous to aircraft are held in the data.
  

• Contours and spot elevations in forest and snow areas may be less accurate.
  

• Not all pipelines including both underground and above ground are held in the data or shown on the printed maps. For the latest information please contact the utility and infrastructure agencies
  

• Permits may be required to visit some sensitive and special islands and areas. Contact the Department of Conservation to see if you need to apply for a permit.

Polygon for each Topo50 map sheet in the Ross Dependency, Antarctic holding extents of each sheet, it's sheet code, name, edition, and revision statement. This is the same information that is printed on each ANTTopo50 map.

A large, massive piece of floating glacier ice of any shape, detached from the front of a glacier into a body of water; extends more than 5m above sea level.

Data Dictionary for iceberg_poly: apps.linz.govt.nz/topo-data-dictionary/index.aspx?...

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: apps.linz.govt.nz/topo-data-dictionary/index.aspx?...

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.

Meltwater_stream; a flow of water that is supplied by melting glacier ice; a "glacial stream" often grayish-white in colour because of the "rock flour"resulting from glacial erosion.

Data Dictionary for melt_stream_cl: apps.linz.govt.nz/topo-data-dictionary/index.aspx?...

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.

Fast ice; any sea ice that forms along and remains attached to the coast or that forms between grounded icebergs or is attached to the bottom in shallow water.

Data Dictionary for fastice_poly: apps.linz.govt.nz/topo-data-dictionary/index.aspx?...

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 closed depression formation forming a closed loop and representing an area of lower ground of less than the vertical interval.

Data Dictionary for depform_edge: apps.linz.govt.nz/topo-data-dictionary/index.aspx?...

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: apps.linz.govt.nz/topo-data-dictionary/index.aspx?...

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: apps.linz.govt.nz/topo-data-dictionary/index.aspx?...

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.

Large area of permanent sea ice.

Data Dictionary for ice_shelf_poly: apps.linz.govt.nz/topo-data-dictionary/index.aspx?...

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.