Helsingin piirijako

The Helsinki district division data includes the boundary lines of the districts within the city, as well as the names and identifiers of the areas. The district division system of Helsinki is a regional division of the entire area of Helsinki created for administrative purposes. The district divisions consist of the following area levels: major district, district, city sub-district and small district. The initial data for the maintenance of the district divisions is the base map and up-to-date detailed plans. The data is maintained in vector form in the Oracle Spatial database. District divisions are constantly updated on the basis of decisions made by the city geodesist. The data is maintained by the City Survey Services of the City of Helsinki Urban Environment Division. The district division data is published as open data as the boundaries change. **Previewing the data in the kartta.hel.fi service:** - [Major districts](https://kartta.hel.fi/link/dBxyPD) - [Districts](https://kartta.hel.fi/link/dBy5wU) - [Small districts](https://kartta.hel.fi/link/dByF8N) - [All base maps layers active](https://kartta.hel.fi/link/dBwxnX) - All base map layers can be found on the website: [https://kartta.hel.fi/](https://kartta.hel.fi/?setlanguage=en) > Layers > Background Maps > Base maps **Coordinate systems:** - Maintained in ETRS-GK25 (EPSG:3879), can be projected to other coordinate systems. See [GetCapabilities query](https://kartta.hel.fi/ws/geoserver/avoindata/wfs?request=GetCapabilities) for other possible coordinate systems. **API addresses:** - WMS API: [https://kartta.hel.fi/ws/geoserver/avoindata/wms](https://kartta.hel.fi/ws/geoserver/avoindata/wms?request=getCapabilities) - WFS API: [https://kartta.hel.fi/ws/geoserver/avoindata/wfs](https://kartta.hel.fi/ws/geoserver/avoindata/wfs?request=getCapabilities) **Layers:** - Piirijako_suurpiiri - Piirijako_peruspiiri - Piirijako_osaalue - Piirijako_pienalue **District divisions: attributes, data types and their key and reliability data:** - id (int). Unique identifier of the feature. Reliable, comprehensively existing information. - aluejako (string). Type of regional division. Reliable, comprehensively existing information. - kunta (string). Municipality. Reliable, comprehensively existing information. - tunnus (string). Identification number of the district division. Reliable, comprehensively existing information. - nimi_fi (string). Name of the district division in Finnish. Reliable, comprehensively existing information. - nimi_se (string). Name of the district division in Swedish. Reliable, comprehensively existing information. - yhtluontipvm (date). Feature creation date (yyyy-mm-dd). Reliable, comprehensively existing information. - yhtmuokkauspvm (date). Previous editing date of the feature (yyyy-mm-dd). Reliable, comprehensively existing information. - yhtdatanomistaja (string). Data owner. Reliable, comprehensively existing information. - kokotunnus (string). ID of the combination of district divisions. Reliable, comprehensively existing information. - paivitetty_tietopalveluun (date). Date of update in information service. (yyyy-mm-dd). Reliable, comprehensively existing information. - datanomistaja (string). Data owner organisation. Reliable, comprehensively existing information. - geom (GeometryPropertyType). Geometry of the feature. ##Helsinki district division boundaries 1995–2024 The Helsinki district division boundaries 1995–2024 data includes the boundary lines of the Helsinki districts, as well as the names and identifiers of the areas from the years 1995–2024. For the years 1995–2000, the data is missing the boundaries of small districts. The source of the publication is the Seutu-CD produced by HSY and the Regional Map published on it. This [Excel file](https://www.hel.fi/hel2/tietokeskus/data/helsinki/Helsingin_aluejaot_2016.xlsx) contains the Helsinki regional divisions for 2016 covering all area levels. The file contains the area codes of the Regional Map, the official regional names of Helsinki and the code+name used by Statistics Finland in its data. The second data consists of postal area codes for city sub-districts and small districts on their own tabs. In particular, the city sub-districts do not fit inside postal areas precisely in all areas (see the [map](https://www.hel.fi/hel2/tietokeskus/data/helsinki/Postialue_Osaalue.jpg)).