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
53580
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
MB2020_V1_00_Centroid_True
Date
Presentation Form
Presentation Form Code
mapDigital
Abstract
This dataset contains the true centroid point layer for the annually released meshblock boundaries as at 1 January 2020.The "true" centroid is the centre of mass of that polygon, such that if some flat substance of uniform thickness and density were cut into the shape of that polygon, then that object would balance at the centroid. The centroid is a useful way of summarizing the locations of a set of polygons as points, particularly when used for comparative analysis. Note that the centroid could potentially fall outside the meshblock polygon, depending on the shape of the polygon. 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.Non-digitised meshblocks cannot have a centroid.
Purpose
This dataset contains the true centroid point layer for the annually released meshblock boundaries as at 1 January 2020.
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
SA2s 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 2020 statistical area 2 pattern, were dissolved using the dissolve tool in the Arc GIS suite. To derive the SA2 boundaries clipped to the coastline, meshblock polygons were dissolved to exclude meshblocks with a land/water attribute of Inlet or Oceanic.
