WFS API

From the dataset abstract

The Helsinki districts dataset includes the boundary lines of the city districts, as well as the names and identifiers of the areas. The initial data for the maintenance of the city district dataset is the base map and up-to-date detailed plans.

The dataset is maintained in vector form in the Oracle Spatial database. The city districts dataset is constantly updated on the basis of city planning. The dataset is maintained by the City Survey Services of the City of Helsinki Urban Environment Division.

The data is available for download in several formats, including JSON, KML, CSV, Esri Shape, and XML. Available formats can always be found under OutputFormat in the GetCapabilities query for the service.

Previewing the data in the kartta.hel.fi service:

• City districts

Coordinate systems:

• Esri Shape: ETRS-GK25 (EPSG:3879)
• KML: WGS 84 (WGS 1984, EPSG:4326)
• API: Maintained in ETRS-GK25 (EPSG:3879), can be projected to other coordinate systems. See GetCapabilities query for other possible coordinate systems.

API addresses:

• WMS API: https://kartta.hel.fi/ws/geoserver/avoindata/wms
• WFS API: https://kartta.hel.fi/ws/geoserver/avoindata/wfs

Layers:

• Kaupunginosajako

City district division: attributes, data types and their key and reliability data in information services:

• 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). Identifier of the city district. Reliable, comprehensively existing information.
• nimi_fi (string). Name of the city district in Finnish. Reliable, comprehensively existing information.
• nimi_se (string). Name of the city district 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.
• paivitetty_tietopalveluun (date). Information service record date (yyyy-mm-dd). Reliable, comprehensively existing information.

Source: Helsingin kaupunginosat