NZ Topo - object class mast_pnt

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


A vertical pole serving as an antenna or antenna support.

Topo50 description

Only those significant either by their size (generally those over 10m) or location are held in the data and shown on the printed maps. Any in the CBD are not held in the data or shown on the printed maps. Note also that a single mast feature may represent one, two or a group of masts in close proximity. Where a mast is located close to a trig, the mast symbol is replaced on the printed map by the text 'Mast'

Topo250 description

Only those significant by their size or location are held in the Topo250 data and shown on the Topo250 printed maps; these are a generalised subset of those shown on the Topo50 series

Representation specification

Representation specification showing mast_pnt

Click to enlarge image

Important information: Not all aerial wires, cableways and obstructions that could be hazardous to aircraft are held in the data or shown on the printed maps

Class attributes

Object classmast_pnt
Entity classTOWER
Additional entity classNot applicable
Object inheritancegraphic_point
Entity sourceUS Standard Entity
Map series Topo50 Topo250
LSLIFF object class75

Object attributes

AttributeLSLIFF code
Shapefile field
Data type
Attribute descriptionAttribute values*
The height of the mast in metres, where known
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
82012-08-28Updated map image and aerial view; added representation specification and example feature photographs
72012-08-28Added scale-specific definitions
62010-03-01removed attribute mast_use
52005-06-30new attribute values for mast_use_2
42003-06-30Unspecified update
32001-11-23Unspecified update
21999-10-01updated data type, new attribute value
11999-03-01initial status