New Zealand Layers

10cm colour orthophotography of the area affected by the 22 February 2011 Christchurch earthquake.

Flown on 24 February 2011 by NZ Aerial Mapping for the Christchurch Response Centre (CRC).

Public Conservation Areas - spatial representation of DOC's management units defined by various acts of parliament and legislation. The attributes in this dataset have been derived from DOC's Land Management system to provide additional information.

LINZ Data Service
Up to date data from Land Information New Zealand is available for free from the LINZ Data Service. Visit the LINZ Data Service for the latest version of this layer: data.linz.govt.nz/layer/767

The full-quality Topo50 map sheets from LINZ for all of New Zealand, excluding the Chatham Islands.

This map series was created in NZ Transverse Mercator 2000. It may look slightly distorted in the Google Map preview used by Koordinates, and may also appear distorted if downloaded in a projection other than NZTM.

IMPORTANT NOTE: Contains data sourced from Land Information New Zealand. Crown Copyright reserved. Land Information New Zealand gives no warranty in relation to the data, including its accuracy, reliability and suitability and accepts no liability whatsoever in relation to any loss, damage or other costs relating to the use of any data, any compilations, derivative works or modifications of the data.

LINZ Data Service
Up to date data from Land Information New Zealand is available for free from the LINZ Data Service. Visit the LINZ Data Service for the latest version of this layer: data.linz.govt.nz/layer/768

20m contours layer from the LINZ 1:50,000 NZTopo database.

Definition: An imaginary line that connects points of equal height value eg the elevation of the land surface above or below a vertical datum.

Related:

• NZ Spot Heights
  

IMPORTANT NOTE: Contains data sourced from Land Information New Zealand. Crown Copyright reserved. Land Information New Zealand gives no warranty in relation to the data, including its accuracy, reliability and suitability and accepts no liability whatsoever in relation to any loss, damage or other costs relating to the use of any data, any compilations, derivative works or modifications of the data.

Track Centrelines - spatial representation of DOC managed track centrelines. Data shows actively managed open tracks. Closed tracks are not shown.

Polygons representing building rooftop outlines for urban Wellington including Makara Beach and Makara Village. Each building has an associated elevation above MSL (Wellington 1953). The rooftop elevation does not include above roof structures such as aerials or chimneys. Captured in 1996 and updated in 1998, 1999, 2002, 2006, 2009, 2011 and 2012 in conjunction with aerial photography refly projects.

1m contours for urban Wellington including Makara Beach and Makara Village. Based on a DTM created from 2006 LiDAR and updated using 2009 photogrammetry masspoints and breaklines where significant changes in the terrain were detected. WCC generalised the contours by up to 0.2m in order to reduce the number of vertices in the dataset. Contours generated from LiDAR and photogrammetry should not be used for detailed engineering design.

LINZ Data Service
Up to date data from Land Information New Zealand is available for free from the LINZ Data Service. Visit the LINZ Data Service for the latest version of this layer: data.linz.govt.nz/layer/327

New Zealand river centrelines from the LINZ 1:50,000 NZTopo database.

Definition: a natural, flowing body of water emptying into an ocean, lake or other body of water and usually fed along it's course by converging tributaries.

Related:

• NZ Rivers (wide sections)
  

IMPORTANT NOTE: Contains data sourced from Land Information New Zealand. Crown Copyright reserved. Land Information New Zealand gives no warranty in relation to the data, including its accuracy, reliability and suitability and accepts no liability whatsoever in relation to any loss, damage or other costs relating to the use of any data, any compilations, derivative works or modifications of the data.

This data is originally from the National Broadband Map (broabandmap.govt.nz).

It represents the previous Telecom Group fibre encompassing Chorus and its parent company Telecom New Zealand.

Changes in ownership means this data may no longer be current. As an example Chorus no longer have the submarine cable (i.e. across the Cook Strait).

Extensively updated, improved and value-added road center lines originally based on LINZ data. NZ Open GPS Maps nzopengps.org/ is an open source project so contributions and feedback are welcome at gwprojects.org/forum.

The maps are constantly being updated. If you want the very latest data you can follow the instructions on this page to make your own shape files: gwprojects.org/forum/viewtopic.php?f=3&t=348

A lot of the additional attributes to do with routing come through from the original data source in Polish Format (.mp). GPSMapEdit is the definitive program used to edit this format: www.geopainting.com/en/

Speed limit

• 0 = 5km/h
  
• 1 = 20km/h
  
• 2 = 40km/h
  
• 3 = 60km/h
  
• 4 = 80km/h
  
• 5 = 100km/h
  
• 6 = 110km/h
  
• 7 = no limit
  

Route Class

• 0 = Residential
  
• 1 = Collector
  
• 2 = Arterial
  
• 3 = Principal HW
  
• 4 = Major HW
  

The speed limit attribute does not refer to legal speed limits. It may be interpreted as an attempt at capturing the ‘actual’ speed a car would travel on a given road, but actually relates to the routing systems used by in-car GPS units so that trip-routing is optimised. For example, a road with speed bumps may be classified as having a speed attribute of 1 (20km/h) so that it is distinct from adjacent roads of category 2 or 3 (40km/h and 60km/h, respectively), even if these are not the legal speed limits for these sections of the road network.

Note that for the majority of residential streets in major cities, roads are classified as 2 (40km/h). If an accurate representation of speed is your intention (rather than solving computationally-simplified routing problems), interpreting 2 as being 50km/h can give a more realistic picture of the road network. An important exception to this is Wellington/Hutt Valley, where most roads are given the attribute 3 (60km/hr) where they are mostly 50km/h legally.

There are some legacy issues with the speed attribute, with many roads being populated with attributes en masse some time ago, and have not been updated since. There is also the possibility of inconsistencies in the assignment of speed limit attributes between regions for the same type of roads.

The roadclass attribute is similar to the speed limit attribute, but is intended for limited-performance GPS units that would not be able to determine the most appropriate route if considering the more realistic speed attributes. It might solve a routing problem with a marginally shorter route (avoiding, say, a highway) as the nominal speed would be the same, although intersections and other characteristics of the route would actually make it less favourable. A GPS unit using roadclass to solve a routing problem will attempt to find a ‘backbone’ of high-order routeclass, and only use lower-priority roads to get to and from this backbone. In a GIS, routeclass may be appropriate to use in order to solve a large number of network problems more quickly than using the speed attribute. Given that this attribute has fewer categories than the speed limit attribute, it also makes for excellent visualisation of the road network that could be used in map outputs even if the underlying attributes are neglected in favour of speed.