Stats NZ CON2016_HD_Clipped is the high definition set of regional council constituency boundaries for 2016, clipped to the coastline for cartographic purposes, as defined by the regional councils and Local Government Commission but maintained by Statistics New Zealand (the custodian).Constituencies are established under the Local Electoral Act 2001 and result from the division of a region for electoral purposes.Constituencies are divisions of regional council areas. They are defined at meshblock level, and do not coincide with area units. They are created, based on population, to be the voting areas within councils. Constituencies are required to reflect communities of interest. Their boundaries, so far as is practicable, coincide with those of territorial authorities or wards. The boundaries of constituencies may be reviewed before each three-yearly local government election. Regional councils must review their representation arrangements at least once every six years. The provisions for such reviews are in the Local Government Act 2002. Constituencies are numbered based on their corresponding regional council. Each constituency has a unique four-digit code. The first two digits represent the regional council that the constituency lies within. The last two digits are sequential and represent the number of constituencies within a regional council. For example, the West Coast Regional Council (12) contains three constituencies, which are coded 1201, 1202, and 1203.Digital boundary data became freely available on 1 July 2007.

For further metadata, please refer to the metadata documents on the Stats NZ website: http://www.stats.govt.nz/browse_for_stats/Maps_and_geography/Geographic-areas/digital-boundary-files.aspx#metadata