Topographic Data - Page 2

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:

• Representation of a road or track does not necessarily indicate public right of access. For access rights, maps and other information, contact the New Zealand Walking Access Commission - www.walkingaccess.govt.nz

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 Closed tracks are defined as being no longer maintained or passable and should not be used.

• 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.

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)
• NZ Island Polygons (Topo 1:50k)
• NZ Auckland Is Island Polygons (Topo, 1:50k)
• NZ Campbell Is / Motu Ihupuku Island Polygons (Topo, 1:50k)
• NZ Antipodes Is Island Polygons (Topo, 1:25k)
• NZ Kermadec Is Island Polygons (Topo, 1:25k)
• NZ Bounty Is Island Polygons (Topo, 1:25k)
• NZ Snares Is / Tini Heke Island Polygons (Topo, 1:25k)
• NZ Chatham Is island polygons (Topo, 1:50k)

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 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.

For more detailed description of each layer refer to the layer urls above.

An imaginary line that connects points of equal height value eg the elevation of the land surface above or below a vertical datum, in this case of LINZ topographic mapping, this is Mean Sea Level.

Data Dictionary for contour: apps.linz.govt.nz/topo-data-dictionary/index.aspx?... . The first contour is the 160m, then 300m, and every 300m thereafter.

This layer is a component of the Topo500 data. The Topo500 map series will, when it is created, provide updated topographic mapping for the New Zealand mainland at 1:500,000 scale.

Any standing body of fresh inland water.

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

This layer is a component of the Topo50 map series. The Topo50 map series provides topographic mapping for the New Zealand mainland, Chatham and New Zealand's offshore islands, at 1:50,000 scale.

Further information on Topo50:
www.linz.govt.nz/topography/topo-maps/topo50

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

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

This layer is a component of the Topo50 map series. The Topo50 map series provides topographic mapping for the New Zealand mainland, Chatham and New Zealand's offshore islands, at 1:50,000 scale.

Further information on Topo50:
www.linz.govt.nz/topography/topo-maps/topo50

An imaginary line that connects points of equal height value eg the elevation of the land surface above or below a vertical datum, in this case of LINZ topographic mapping, this is Mean Sea Level.

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

This layer is a component of the Topo250 map series. The Topo250 map series provides topographic mapping for the New Zealand mainland and Chatham Islands, at 1:250,000 scale.

Further information on Topo250: www.linz.govt.nz/topography/topo-maps/topo250

A relatively permanent walled and roofed construction.

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

This layer is a component of the Topo50 map series. The Topo50 map series provides topographic mapping for the New Zealand mainland, Chatham and New Zealand's offshore islands, at 1:50,000 scale.

Further information on Topo50:
www.linz.govt.nz/topography/topo-maps/topo50

A height above a vertical datum, represented on a map by a dot locator with the elevation printed beside the dot. Unlike trigonometrical stations, spot heights are not identifiable on the ground

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

This layer is a component of the Topo50 map series. The Topo50 map series provides topographic mapping for the New Zealand mainland, Chatham and New Zealand's offshore islands, at 1:50,000 scale.

Further information on Topo50:
www.linz.govt.nz/topography/topo-maps/topo50

This layer has been provided to enable potential users to identify the coverage of photography for Mainland NZ flown on behalf of the Crown between 1936 and 2005. It shows the extent of each aerial survey undertaken. The Historic Aerial Photos, Photo Footprints (1936-2005) layer shows the extent of each photograph in the survey.

See The Crown historic aerial photo archive scanning project for information about the scanning project.

The original data used to create this layer was compiled prior to 2000 and it is possible that some errors exist in the data fields. If you are aware of any inaccuracies, please contact LINZ: info@linz.govt.nz or +64 4 4600110.

How to Access Photos:

The Collection exists as photographic negatives (most are not in digital form) so the images are not downloadable from the LDS.

Scanned photos from the partner regions may be viewed and downloaded from Retrolens.

The Crown Aerial Film Negative Collection is managed for LINZ by WSP Opus International.

You can are order images from the Collection from Opus NZ in a number of formats, including:

• contact prints
• enlargements
• digital files
• precision scans for photogrammetric production
• orthophotos

You will need to tell Opus NZ the survey number (the value in the ‘SURVEY’ attribute) covering your area of interest.

Opus NZ will be able to provide information about the cost of providing images in the various formats. Contact them at: photosales@opus.co.nz or 0800 680 690

There are a small number of images held in the Collection that have not been referenced in the LDS layers due to incomplete metadata. Opus NZ will be able to let you know if additional photographs are available in your area of interest.

There are also a large number of images which previously belonged to New Zealand Aerial Mapping and which are now are available for public use. Historic Aerial Photos, Survey Footprints, NZAM (1939-2008) shows the extent of each survey undertaken. You can order these photos by contacting Opus NZ.

A cable or cables supported by poles or towers for the transmission of electricity

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

This layer is a component of the Topo50 map series. The Topo50 map series provides topographic mapping for the New Zealand mainland, Chatham and New Zealand's offshore islands, at 1:50,000 scale.

Further information on Topo50:
www.linz.govt.nz/topography/topo-maps/topo50