NZ Topo - object class reef_poly

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

Description

A ridge, usually of rocks or coral, lying near the surface of the sea, which may be visible at low tide, but is usually covered with water

Topo50 description

Only those significant either by their size or location, and sufficiently visible (water quality and wind conditions at the time imagery is collected can influence the ability to capture these features with certainty and accuracy), are held in the data and shown on the printed maps. LINZ charts may be a better source for reef features, see http://www.linz.govt.nz/hydro/charts/index.aspx

Representation specification

Representation specification showing reef_poly

Click to enlarge image

Class attributes

AttributeValue
Object classreef_poly
Entity classREEF
Additional entity classNot applicable
Object inheritancesimple_area
Entity sourceProposed change to US Entity
Map series Topo50
LSLIFF object class331

Object attributes

AttributeLSLIFF code
Shapefile field
Data type
Attribute descriptionAttribute values*
name1001
name
string
The name of the reef, where known. 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.
"Aotea Reef"
{empty}
name_macronated1140
macronated
boolean
Indicates whether the entry in the name_ascii field contains a macronated vowel. Where the value is "Y" go to http://www.linz.govt.nz/placenames/find-names/macrons/index.aspx for a list of places or feature names within New Zealand that are gazetted and include macrons
Y
N
reef_composition1077
compositn
string
coral
{empty}
name_ascii9000
name_ascii
string
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.
UFID1000
t50_fid
integer
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.
"3254886"

* 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
32008-04-10Removed reference to seed and void objects
22001-11-23Unspecified update
11999-03-01intial status