Hydrologiarajapinta — Finnish national hydrological archive
The Finnish national hydrological record as an OData service: daily discharge, water level, runoff, evaporation, areal and point precipitation, snow water equivalent, ice thickness, freeze-up and break-up dates, and surface and profile water temperature, for the network Syke operates.
Rights
- Licence
- CC BY 4.0
- Commercial reuse
- Yes
- Redistribution
- Yes
- Derivative use
- Yes
- Attribution required
- YesContains data from the Finnish Environment Institute (Syke), licensed under CC BY 4.0.
- Terms last checked
- 26 August 2026
Access and coverage
- Publisher
- Suomen ympäristökeskus (Finnish Environment Institute)
- Website
- https://www.vesi.fi/
- Geographic coverage
- Finland — 711 discharge stations
- Temporal coverage
- 1911 onwards
- Resolution
- Daily values computed by the publisher
- Update frequency
- daily
- Formats
- json, api
- Bulk download
- Available
- Registration required
- No
- Cost to Hydrionis
- Free
- Domains
- river flow, precipitation, snow ice, temperature, evaporation
Notes
Ingested in Sprint 7. Two properties made this worth building rather than another flag on the map. Syke computes the daily discharge itself, so Hydrionis stores the publisher’s own number rather than re-deriving a statistic under the same name. And every station record carries PaaVesalNimi, the main drainage basin — so Finnish gauges join the water graph at ingestion, in the way Sweden’s do and England’s do not. The archive carries per-value quality flags: a value flagged "!" (mahdollisesti virheellinen arvo, possibly erroneous) is refused, because Hydrionis cannot show a per-point flag on a chart and a doubted value plotted beside a trusted one is indistinguishable from it. Interpolated values are stored and described, on the same reasoning that keeps SMHI’s roughly-checked values: interpolation is a stated method, not a doubt, and removing it would punch holes in the middle of continuous records. Coordinates are published as degrees-minutes-seconds integers, not decimal degrees; read as decimals they would place Finnish gauges in the Indian Ocean.
What Hydrionis uses it for
10,327,195 observations across 1 metrics currently reference this source.