<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This dataset contains the true centroid point layer for the annually released statistical area 2 (SA2) boundaries as at 1 January 2021.. </SPAN></P><P><SPAN>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 location of a set of polygons as points, particularly when used for comparative analysis. Note that the centroid could potentially fall outside the SA2 polygon, depending on the shape of the polygon.</SPAN></P><P><SPAN>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. </SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Purpose
This dataset contains the true centroid point layer for the annually released statistical area 2 (SA2) 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
Resource Constraints
Constraints
Use Limitation
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>Creative Commons Attribution 4.0 International (CC BY 4.0)</SPAN></SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Language
eng
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 2021 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.
