NZ Topo - object class coastline

This page describe the coastline object class used to represent objects in the NZTopo topographic database.


The line forming the boundary between the land and sea, defined by mean high water.

Topo50 description

The value of MHW varies across the country from 0.5 to 2.5m above MSL. To find out more information about Tidal Levels refer to the Tidal Information in the NZ Nautical Almanac Note also that the coastline feature is reserved in the data for the North, South and Stewart Islands of mainland New Zealand. All the remaining islands have their 'coastline' captured as island_poly. Where coastline is close to a road, the printed map may only show the road representation; both features are held in the data. Where the coastline is a wharf edge, the printed map may only show the wharf representation; again both features are held in the data.

Topo250 description

A generalised subset of the Topo50 coastline is held in the Topo250 data and shown on the Topo250 printed maps

Representation specification

Representation specification showing coastline

Click to enlarge image

See also: island_poly

Class attributes

Object classcoastline
Entity classSHORELINE
Additional entity classNot applicable
Object inheritancesimple_line
Entity sourceUS Standard Entity
Map series Topo250 Ant50 Topo50
LSLIFF object class24

Object attributes

AttributeLSLIFF code
Shapefile field
Data type
Attribute descriptionAttribute values*
It is intended that this attribute will be used to hold the elevation value of mean high water (above mean sea level) in future. Until this time, this value will be left empty
A unique identifier for use on Topo50 data in the LINZ Data Service. This is not a universal ID. The intention is to manage these ID’s as persistent, however this is not guaranteed and there will be instances where what appears to be a minor change to a feature may result in a new ID being assigned.

* See explanation of attribute values for more information about how attribute values are represented.

Change log

Feature versionRevisedDescription
92013-05-07Updated tidal range values
82012-08-28Updated map image and aerial view; added representation specification and example feature photographs
72012-08-28Added scale-specific definitions
62012-08-27Changed description on elevation attribute
52008-04-10Removed reference to seed and void objects
42004-06-14new associated objects
32001-11-23Unspecified update
22000-11-01updated data type
11999-03-01initial status