NZ Topo - object class drain_cl

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


A channel which carries surface water.

Topo50 description

Only those drains significant by their size 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 These objects were originally held in the data as river_cl and they are being progressively changed as the sheets are being updated. Where a drain is close to a road, the position held in the data is as close to it's true position as capture techniques permit. This may result in the drain_cl feature being obscurred by the road symbol in the printed map

Representation specification

Representation specification showing drain_cl

Click to enlarge image

Class attributes

Object classdrain_cl
Additional entity classNot applicable
Object inheritancesimple_line
Entity sourceUS Standard Entity
Map series Topo50 Topo250
LSLIFF object class29

Object attributes

AttributeLSLIFF code
Shapefile field
Data type
Attribute descriptionAttribute values*
The name of the drain, where kniown. Text data from July 2012 will be in UTF-8 format. If your system is not UTF-8 compliant, you will need to use the name_ascii attribute, which has had any macronated vowels removed. UTF-8 stands for Unicode Transformation Format-8. It is an octet (8-bit) lossless encoding of Unicode characters. UTF-8 encodes each Unicode character as a variable number of 1 to 4 octets, where the number of octets depends on the integer value assigned to the Unicode character. It is an efficient encoding of Unicode documents that use mostly US-ASCII characters because it represents each character in the range U+0000 through U+007F as a single octet. UTF-8 is the default encoding for XML.
"Church Road Gully Drain"
Indicates whether the entry in the name_ascii field contains a macronated vowel. Where the value is "Y" go to for a list of places or feature names within New Zealand that are gazetted and include macrons
Text data from July 2012 will be in UTF-8 format. If your system is not UTF-8 compliant, you will need to use this attribute, which has had any macronated vowels removed.
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
72012-08-28Updated map image and aerial view; added representation specification and example feature photographs
62012-08-28Added scale-specific definitions
52012-08-16Name attribute in UTF-8 format; added name_ascii attribute
42010-03-01Added name_macronated attribute
32001-11-23Unspecified update
22001-11-01new attribute
11999-03-01intial status