Helsingfors floder, bäckar och Diken

The data includes the openwaters in Helsinki, i.e. rivers, streams, ditches, nores, and the piping shares of the largest openwaters. The structure of the data follows the data model of HSY’s Hulewater Data Management project (huti). The data was produced in 2022 based on spatial data sets. The data sources of the dataset are listed in [here](https://kartta.hel.fi/paikkatietohakemisto/pth/?id=499). In the base map, the two edges formed by the base map have been classified as a channel with a width of more than 2 metres and the centre line has been digitised on the basis of the base map. With the exception of Östersundom, which has been supplemented on the basis of a basic map and with a width of more than 2 metres, streams that collect water from more than 75 hectares on the basis of HSY data are classified. From the rivers crossing the Helsinki border, the Mätäjoki river has been digitised on the basis of the main map of Vantaa. In the Östersundom area, the routes to Sipoo and Vantaa have been digitised with rough accuracy on the basis of the base map. Ditches less than 2 metres wide have been copied unwrought from the base map, so their timeliness and accuracy vary. The ditches in the Östersundom area have been supplemented on the basis of an elevation model. Preview of the material [in the City of Helsinki map service](https://kartta.hel.fi/link/b9Je9r). The material can be downloaded in several formats, including JSON, KML, CSV, Esri Shape and XML. Available formats can always be found in the outputFormat section of the service [GetCapabilities](https://kartta.hel.fi/ws/geoserver/avoindata/wfs?request=GetCapabilities). For more information and guidance, see [WFS search guide](https://kartta.hel.fi/avoindata/dokumentit/Prosessi_Ty%C3%B6ohje_kyselypalveluiden_kaytto_ulkoverkko.pdf). ** Coordinate system(s):** — ETRS-GK25 (EPSG:3879). Maintenance coordinates. The data can also be projected in other coordinate systems. Other possible coordinate systems can be found in the GetCapabilities document of the interface service. **Addresses of interface services:** — WFS interface: [https://kartta.hel.fi/ws/geoserver/avoindata/wfs](https://kartta.hel.fi/ws/geoserver/avoindata/wfs?request=getCapabilities) — WMS interface: [https://kartta.hel.fi/ws/geoserver/avoindata/wms](https://kartta.hel.fi/ws/geoserver/avoindata/wms?request=getCapabilities) **Published levels:** — Open loops **Level attributes:** — ID: an automatically generated unique identifier. — the channel type: target line type. River = Over 5 m wide rivers (Vantaanjoki and Keravanjoki). Stream = Uniform networks with natural-like sections with a width of 2-5 m. Oja = lines under 1 m wide on the heel map and 2-5 m wide lines on the heel map, which are located outside the contiguous streams or have been created as a result of human activity on the basis of a map interpretation. Noro = The channel classified as a nore based on Ely’s assessment or natural mapping. There is no comprehensive mapping of nores in Helsinki. Some of the Norwegians verified endangered and observable habitat types from the spatial dataset (2022). — medium width: based on the classification of the base map. 3 = more than 5 meters. 2 = 2-5 meters. 1 = Less than 2 meters. With the exception of Östersundom, in which the area is classified as 2-5 m wide, streams that collect water from more than 75 hectares on the basis of HSY data are classified. — additional information: link to the target page in the Nature Information System. — type of land: based on Helsinki’s new soil map (Published 2017, updated 2022). The soil type determined for the sections of the channels on the basis of a geo-spatial analysis. — length: length of the section of the line in metres to two decimal places. — the bridge: does not apply to lines less than 2 metres wide.Based on HSY’s drum and bridge data. The geometry of the open line is consistent with the geometry of the bridge material (snapping). The portions of the line running under the bridge are valued by 1. on the drum: does not apply to lines less than 2 metres wide. Based on HSY’s drum and bridge data. The geometry of the open line is consistent with the geometry of the drum material (snapping). The portions of the line running in a drum or tube receive a value of 1. — natural state: based on Hazardous and Observed Habitats. Applies only to the invented portions of the channels.