NZ Topo - object class ladder_cl

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


A set of steps, or rungs, inserted in two uprights to serve as a means of ascending a cliff-face

Topo50 description

ladder_cl is used when the feature is large enough to be captured at 1:50,000 as a line feature. Ladders were originally captured by surveyors in the field. As they are not always visible on imagery, these features are left unchanged unless more current information becomes available

Representation specification

Representation specification showing ladder_cl

Click to enlarge image

See also: track_cl ladder_pnt

Class attributes

Object classladder_cl
Entity classLADDER
Additional entity classNot applicable
Object inheritancesimple_line
Entity sourceProposed NZ Std Entity
Map series Topo50
LSLIFF object class64

Object attributes

AttributeLSLIFF code
Shapefile field
Data type
Attribute descriptionAttribute values*
chainthe ladder is a chain ladder - that is where rungs are inserted between two lengths of chain
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
52012-08-28Updated map image and aerial view; added representation specification and example feature photographs
42012-08-28Added scale-specific definitions
32001-11-23Unspecified update
11999-03-01intial status