NZ Topo - object class shoal_poly

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

Description

A submarine object over which the water is shallow, which is detached from the shore and whose bottom is visible at low water; may be a menace to navigation on the surface

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 shoal features, see http://www.linz.govt.nz/hydro/charts/index.aspx

Representation specification

Representation specification showing shoal_poly

Click to enlarge image

See also: reef_poly

Class attributes

Attribute Value
Object class shoal_poly
Entity class BAR
Additional entity class Not applicable
Object inheritance simple_area
Entity source US Standard Entity
Map series Topo50
LSLIFF object class 343

Object attributes

Attribute LSLIFF code
Shapefile field
Data type
Attribute description Attribute values*
name 1001
name
string
The name of the feature, 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.
"Wairau Shoal"
{empty}
name_macronated 1140
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/regulatory/place-names/find-place-name/find-m%C4%81ori-place-names-dual-names-and-alternative-names for a list of places or feature names within New Zealand that are gazetted and include macrons
Y
N
name_ascii 9000
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.
UFID 1000
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 version Revised Description
6 2012-08-28 Updated map image and aerial view; added representation specification and example feature photographs
5 2012-08-28 Added scale-specific definitions
4 2010-03-01 Added name_macronated attribute
3 2008-04-10 Removed reference to seed and void objects
2 2001-11-23 Unspecified update
1 1999-03-01 intial status