ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Spatial Representation Info
Vector Spatial Representation
Topology Level Code
geometryOnly
Geometric Object Type Code
point
Integer
29894
Reference System Info
Reference System
Reference System Identifier
Identifier
Code
2193
Code Space
EPSG
Version
8.6.2
Identification Info
Data Identification
Citation
Citation
Title
SA12021_V1_00_Centroid_Inside
Date
Presentation Form
Presentation Form Code
mapDigital
Abstract
This dataset contains the inside centroid point layer for the annually released statistical area 1 (SA1) boundaries as at 1 January 2021.The "inside" centroid is a point which always falls inside each SA1 polygon as this is often desirable. The placement of the point is typically in the widest part of the polygon. The algorithms used are proprietary to ESRI and are related to label placement. Note that the "inside" centroid is NOT always the same as the center of gravity ("true" centroid) of the polygon as in some situations the true centroid may fall outside the SA1 geometry. The dataset contains the EASTING and NORTHING attributes of the centroid point in NZGD2000 New Zealand Transverse Mercator (EPSG:2193) and LATITUDE and LONGITUDE of the centroid point in decimal degrees in WGS1984 (EPSG:4326) projection.
Purpose
This dataset contains the inside centroid point layer for the annually released statistical area 1 (SA1) boundaries as at 1 January 2021.
Credit
Stats NZ
Point Of Contact
Responsible Party
Individual Name
Geospatial Team
Organisation Name
Stats NZ
Contact Info
Contact
Phone
Telephone
Voice
0508 525 525
Address
Address
Electronic Mail Address
geography@stats.govt.nz
Online Resource
Online Resource
Linkage
URL
https://datafinder.stats.govt.nz/
Role
Role Code
owner
Descriptive Keywords
Keywords
Keyword
Centroids
Type
Keyword Type Code
theme
Descriptive Keywords
Keywords
Keyword
Downloadable Data
Resource Constraints
Constraints
Use Limitation
Creative Commons Attribution 4.0 International (CC BY 4.0)
Spatial Representation Type Code
vector
Language
Language Code
eng
Character Set
Character Set Code
utf8
Topic Category Code
boundaries
Version 6.2 (Build 9200) ; Esri ArcGIS 10.3.1.4959
Extent
EX _ Extent
Geographic Element
EX _ Geographic Bounding Box
Extent Type Code
Boolean
true
-180180-47.056014-33.791721
Extent
EX _ Extent
Geographic Element
EX _ Geographic Bounding Box
Extent Type Code
Boolean
true
-180180-47.056014-33.786903
Distribution Info
Distribution
Distribution Format
Format
Name
File Geodatabase Feature Class
Data Quality Info
DQ _ Data Quality
Scope
DQ _ Scope
Level
Scope Code
dataset
Lineage
LI _ Lineage
Statement
SA1s are based on the meshblock pattern. Non-alignment of meshblock to cadastral boundaries is one of a number of reasons for meshblock boundary adjustments. Other reasons include requests from local authorities, Local Government Commission, Electoral Representation Commission, and to make census enumeration processes easier. From the meshblock pattern, higher geographies, including the 2021 SA1 pattern, were dissolved using the dissolve tool in the Arc GIS suite. To derive the SA1 boundaries clipped to the coastline, meshblock polygons were dissolved to exclude meshblocks with a land/water attribute of Inlet or Oceanic.
