NZ Topo - object class contour

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

Description

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.

Topo50 description

Contours at a 20m contour interval are held in the data and shown on the Topo50 printed maps. In very flat areas, some supplementary contours with a 10m contour interval are held in the data and shown on the maps. Note that there is no 0m contour, and that the coastline is mean high water mark

Topo250 description

Contours at a 100m contour interval are held in the Topo250 data and shown on the Topo250 printed maps; these are eneralised from those shown on the Topo50 series

Ant50 description

Contours at 20m and 50m contour interval are held in the Ant50 data and shown on the Ant50 maps

Representation specification

Representation specification showing contour

Click to enlarge image

Important information: Contours and height_pnts in forest and snow areas may be less accurate.

See also: coastline height_pnt sinkhole_pnt depform_edge

Class attributes

AttributeValue
Object classcontour
Entity classGROUND SURFACE
Additional entity classNot applicable
Object inheritancegraphic_line
Entity sourceUS Standard Entity
Map series Topo50 Topo250 Ant50 Topo500
LSLIFF object class26

Object attributes

AttributeLSLIFF code
Shapefile field
Data type
Attribute descriptionAttribute values*
contour_designation1023
designated
string
Values
supplementaryA contour added extra to the usual contour interval, added usually only over extensive areas of very low relief.
supplementary
{empty}
contour_natural_formation1024
nat_form
string
Values
depressionUsed to depict depressions in the earth surface.
depression
{empty}
elevation1021
elevation
real
The elevation above mean sea level
"20"
"40"
"60"
contour_definition1126
definition
string
Values
indefinitethe position of the object cannot be placed within the usual accuracy tolerance
indefinite
{empty}
UFID1000
t50_fid
integer
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.
"3254886"

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

Change log

Feature versionRevisedDescription
72012-08-28Updated map image and aerial view; added representation specification and example feature photographs
62012-08-28Added scale-specific definitions
52010-01-02updated comments section
42003-06-30removed attribute
32001-11-23Unspecified update
22000-03-31comments, new attribute
11999-03-01initial status