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

Attribute Value
Object class mast_pnt
Entity class TOWER
Additional entity class Not applicable
Object inheritance graphic_point
Entity source US Standard Entity
Map series Topo50 Topo250
LSLIFF object class 75

Object attributes

Attribute LSLIFF code
Shapefile field
Data type
Attribute description Attribute values*
mast_height 1050
The height of the mast in metres, where known
UFID 1000
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 version Revised Description
8 2012-08-28 Updated map image and aerial view; added representation specification and example feature photographs
7 2012-08-28 Added scale-specific definitions
6 2010-03-01 removed attribute mast_use
5 2005-06-30 new attribute values for mast_use_2
4 2003-06-30 Unspecified update
3 2001-11-23 Unspecified update
2 1999-10-01 updated data type, new attribute value
1 1999-03-01 initial status