Statistical Area 2 2025

This dataset is the definitive version of the annually released statistical area 2 (SA2) boundaries as at 1 January 2025 as defined by Stats NZ. This version contains 2,395 SA2s (2,379 digitised and 16 with empty or null geometries (non-digitised)). SA2 is an output geography that provides higher aggregations of population data than can be provided at the statistical area 1 (SA1) level. The SA2 geography aims to reflect communities that interact together socially and economically. In populated areas, SA2s generally contain similar sized populations. The SA2 should: form a contiguous cluster of one or more SA1s, excluding exceptions below, allow the release of multivariate statistics with minimal data suppression, capture a similar type of area, such as a high-density urban area, farmland, wilderness area, and water area, be socially homogeneous and capture a community of interest. It may have, for example: - a shared road network, - shared community facilities, - shared historical or social links, or - socio-economic similarity, form a nested hierarchy with statistical output geographies and administrative boundaries. It must: - be built from SA1s, - either define or aggregate to define SA3s, urban areas, territorial authorities, and regional councils. SA2s in city council areas generally have a population of 2,000–4,000 residents while SA2s in district council areas generally have a population of 1,000–3,000 residents. In major urban areas, an SA2 or a group of SA2s often approximates a single suburb. In rural areas, rural settlements are included in their respective SA2 with the surrounding rural area. SA2s in urban areas where there is significant business and industrial activity, for example ports, airports, industrial, commercial, and retail areas, often have fewer than 1,000 residents. These SA2s are useful for analysing business demographics, labour markets, and commuting patterns. In rural areas, some SA2s have fewer than 1,000 residents because they are in conservation areas or contain sparse populations that cover a large area. To minimise suppression of population data, small islands with zero or low populations close to the mainland, and marinas are generally included in their adjacent land-based SA2. Zero or nominal population SA2s To ensure that the SA2 geography covers all of New Zealand and aligns with New Zealand’s topography and local government boundaries, some SA2s have zero or nominal populations. These include: - SA2s where territorial authority boundaries straddle regional council boundaries. These SA2s each have fewer than 200 residents and are: Arahiwi, Tiroa, Rangataiki, Kaimanawa, Taharua, Te More, Ngamatea, Whangamomona, and Mara. - SA2s created for single islands or groups of islands that are some distance from the mainland or to separate large unpopulated islands from urban areas - SA2s that represent inland water, inlets or oceanic areas including: inland lakes larger than 50 square kilometres, harbours larger than 40 square kilometres, major ports, other non-contiguous inlets and harbours defined by territorial authority, and contiguous oceanic areas defined by regional council. - SA2s for non-digitised oceanic areas, offshore oil rigs, islands, and the Ross Dependency. Each SA2 is represented by a single meshblock. The following 16 SA2s are held in non-digitised form (SA2 code; SA2 name): 400001; New Zealand Economic Zone, 400002; Oceanic Kermadec Islands, 400003; Kermadec Islands, 400004; Oceanic Oil Rig Taranaki, 400005; Oceanic Campbell Island, 400006; Campbell Island, 400007; Oceanic Oil Rig Southland, 400008; Oceanic Auckland Islands, 400009; Auckland Islands, 400010 ; Oceanic Bounty Islands, 400011; Bounty Islands, 400012; Oceanic Snares Islands, 400013; Snares Islands, 400014; Oceanic Antipodes Islands, 400015; Antipodes Islands, 400016; Ross Dependency. SA2 numbering and naming Each SA2 is a single geographic entity with a name and a numeric code. The name refers to a geographic feature or a recognised place name or suburb. In some instances where place names are the same or very similar, the SA2s are differentiated by their territorial authority name, for example, Gladstone (Carterton District) and Gladstone (Invercargill City). SA2 codes have six digits. North Island SA2 codes start with a 1 or 2, South Island SA2 codes start with a 3 and non-digitised SA2 codes start with a 4. They are numbered approximately north to south within their respective territorial authorities. To ensure the north–south code pattern is maintained, the SA2 codes were given 00 for the last two digits when the geography was created in 2018. When SA2 names or boundaries change only the last two digits of the code will change. High-definition version This high definition (HD) version is the most detailed geometry, suitable for use in GIS for geometric analysis operations and for the computation of areas, centroids and other metrics. The HD version is aligned to the LINZ cadastre. Macrons Names are provided with and without tohutō/macrons. The column name for those without macrons is suffixed ‘ascii’. Digital data Digital boundary data became freely available on 1 July 2007 Further information To download geographic classifications in table formats such as CSV please use Ariā For more information please refer to the Statistical standard for geographic areas 2023. Contact: [e-mail]本数据集为新西兰统计局（Stats NZ）定义的、截至2025年1月1日的年度发布版官方统计区域2（statistical area 2, SA2）边界数据集。本版本共包含2395个SA2区域，其中2379个已完成数字化，16个几何信息为空或为null（未数字化）。 SA2是一种产出地理单元，其可提供的人口数据聚合粒度高于统计区域1（statistical area 1, SA1）。SA2地理单元旨在反映社会与经济互动紧密的社区。在人口密集区域，SA2的人口规模通常较为相近。SA2应满足以下要求： - 由一个或多个SA1区域组成连续集群（下述例外情况除外）； - 支持在尽可能少进行数据抑制的前提下发布多元统计数据； - 覆盖类型相近的区域，例如高密度都市区、农田、荒野区域与水域； - 具备社会同质性，并能体现特定利益共同体。 其可具备的特征例如： - 共享道路网络 - 共享社区设施 - 共享历史或社会关联 - 社会经济特征相似 且应与统计产出地理单元及行政边界形成嵌套层级关系。 SA2必须满足以下要求： - 由SA1区域构建而成； - 可用于定义或聚合生成SA3区域、都市区、领地当局及区域议会边界。 城市议会辖区内的SA2通常拥有2000~4000名居民，而地区议会辖区内的SA2通常拥有1000~3000名居民。在大型都市区中，单个SA2或一组SA2通常大致对应单一郊区。在农村区域，农村居民点会与周边农村区域一同归入对应的SA2中。 针对存在大量商业与工业活动的城市区域SA2，例如港口、机场、工业区、商业区与零售区域，其居民数量通常不足1000人。此类SA2可用于分析企业人口统计、劳动力市场与通勤模式。在农村区域，部分SA2因位于保护区内或覆盖人口稀少的大面积区域，居民数量同样不足1000人。 为尽可能减少人口数据的抑制发布，靠近大陆的低人口或零人口小型岛屿以及码头通常会被归入邻近的陆基SA2中。 零人口或名义人口SA2 为确保SA2地理单元覆盖新西兰全境，并与新西兰地形及地方政府边界对齐，部分SA2拥有零或名义人口规模，具体包括： - 领地当局边界跨区域议会边界的SA2。此类SA2的居民数量均不足200人，分别为：Arahiwi、Tiroa、Rangataiki、Kaimanawa、Taharua、Te More、Ngamatea、Whangamomona与Mara。 - 为远离大陆的单个岛屿或岛屿群设立的SA2，或用于将大型无人岛与都市区分隔开的SA2； - 代表内陆水域、海湾或海洋区域的SA2，包括：面积超过50平方公里的内陆湖泊、面积超过40平方公里的港口、主要港口、由领地当局定义的其他非连续海湾与港口，以及由区域议会定义的连续海洋区域； - 用于未数字化海洋区域、近海石油钻井平台、岛屿及罗斯属地（Ross Dependency）的SA2。 每个此类SA2均由单个统计地块（meshblock）表示。 以下16个SA2以非数字化形式存储（SA2代码；SA2名称）： 400001; 新西兰经济区, 400002; 海洋克马德克群岛, 400003; 克马德克群岛, 400004; 塔拉纳基海洋石油钻井平台, 400005; 坎贝尔岛海洋区域, 400006; 坎贝尔岛, 400007; 南地海洋石油钻井平台, 400008; 奥克兰群岛海洋区域, 400009; 奥克兰群岛, 400010; 邦蒂群岛海洋区域, 400011; 邦蒂群岛, 400012; 斯奈尔斯群岛海洋区域, 400013; 斯奈尔斯群岛, 400014; 安蒂波德斯群岛海洋区域, 400015; 安蒂波德斯群岛, 400016; 罗斯属地。 SA2编号与命名 每个SA2均为具备名称与数字代码的单一地理实体。其名称对应某一地理特征、公认地名或郊区。在部分地名相同或高度相似的场景中，SA2会通过其所属领地当局名称加以区分，例如：格拉德斯通（卡特顿地区）与格拉德斯通（因弗卡吉尔市）。 SA2代码为6位数字：北岛SA2代码以1或2开头，南岛SA2代码以3开头，未数字化SA2代码以4开头。各领地当局辖区内的SA2编号大致遵循从北到南的顺序。为维持北到南的代码编码规律，2018年创建地理单元时，代码最后两位设为00。当SA2名称或边界发生变更时，仅代码的最后两位会发生变化。 高清版本 本高清（HD）版本拥有最精细的几何精度，适用于地理信息系统（GIS）中的几何分析操作，以及面积、质心与其他指标的计算。该高清版本与新西兰土地信息局（LINZ）的地籍数据对齐。 长音符 名称同时提供带毛利长音符（tohutō/macrons）与不带长音符的版本，不带长音符版本的列名后缀为"ascii"。 数字数据 本数字边界数据于2007年7月1日起免费对外开放。 进一步信息 如需下载CSV等表格格式的地理分类数据，请使用Ariā平台。 如需了解更多信息，请参阅《2023年地理区域统计标准》。 联系方式：[e-mail]