NZ Topo - object class blowhole_pnt

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


A hole in a coastal rock formation through which sea water is forced violently up by tide or a wave.

Topo50 description

Blowholes have become a legacy feature. This means that they will remain in the data until a sheet undergoes revision. During this process the features will be re-classified as a geographic_name_pnt

Representation specification

Representation specification showing blowhole_pnt

Click to enlarge image

Class attributes

Object classblowhole_pnt
Entity classBLOWHOLE
Additional entity classNot applicable
Object inheritancegraphic_point
Entity sourceProposed NZ Entity
Map series Topo50
LSLIFF object class198

Object attributes

This object class does not have attributes.

Change log

Feature versionRevisedDescription
42012-08-28Updated map image and aerial view; added representation specification and example feature photographs
32012-08-27Now defined as a legacy feature
22001-11-23Unspecified update
11999-03-01intial status