Data sources
SeaData combines data from the sources below. For each source we list the rights holder, the licence under which the data is available and — where the licence requires it — the verbatim attribution text.
SeaData processes this data: it is interpolated to the given position, converted and combined. Results therefore differ from the original source. See also the terms and conditions.
Tides and sea level
Global tidal heights (17 constituents, 1/8° grid)
Rights holderDGFI-TUM — Hart-Davis, Piccioni, Dettmering, Schwatke, Passaro, Seitz
Required attributionHart-Davis M., Piccioni G., Dettmering D., Schwatke C., Passaro M., Seitz F. (2021). EOT20 — A global Empirical Ocean Tide model from multi-mission satellite altimetry. SEANOE. https://doi.org/10.17882/79489
Measured tidal constants for ports (tide gauges)
Rights holderDGFI-TUM — Hart-Davis, Dettmering, Seitz
Required attributionHart-Davis M., Dettmering D., Seitz F. TICON-4: TIdal CONstants from multi-mission satellite altimetry and tide gauges. SEANOE. https://doi.org/10.17882/109129
Tidal heights as comparison model; ports without a tide gauge
Rights holderLEGOS, NOVELTIS and CLS — funded by CNES, distributed by AVISO+
Required attributionThe FES2022 Tide product was funded by CNES, produced by LEGOS, NOVELTIS and CLS and made freely available by AVISO. CNES, 2024. FES2022 (Finite Element Solution) Tidal model (Version 2024) [Data set]. CNES. https://doi.org/10.24400/527896/A01-2024.004
Tidal current: speed and direction
Rights holderNOVELTIS, LEGOS and CLS — distributed by AVISO+ with support from CNES
Required attributionFES2014 was produced by Noveltis, Legos and CLS and distributed by Aviso+, with support from Cnes (https://www.aviso.altimetry.fr/)
Tidal prediction for comparison
Rights holderTidesAtlas
Water level (TOTAL/TIDE/SURGE) for Norwegian tide stations, relative to mean sea level
Rights holderMeteorologisk institutt (MET Norway); getijforcering: Kartverket (Norwegian Mapping Authority)
Required attributionWater level forecast from MET Norway (Norwegian Meteorological Institute); astronomical tide from Kartverket (Sehavniva). Licensed under NLOD 2.0 / CC BY 4.0.
Tidal heights as fifth tide model (1/16° grid)
Rights holderDTU Space, Technical University of Denmark
LicenceWetenschappelijk gebruik, met bronvermelding
Required attributionDTU Space — DTU23 Ocean Tide model.
Measured water levels and astronomical predictions for the Dutch coast and inland waters
Rights holderRijkswaterstaat, Ministerie van Infrastructuur en Waterstaat
LicenceOpen data
Required attributionBron: Rijkswaterstaat (waterinfo.rws.nl).
Official tidal predictions for Danish stations and the WAM wave model
Rights holderDanmarks Meteorologiske Institut (DMI)
LicenceDMI Open Data
Required attributionBron: Danmarks Meteorologiske Institut (DMI).
Measured water levels along the UK coast
Rights holderEnvironment Agency (Verenigd Koninkrijk)
Required attributionContains Environment Agency information licensed under the Open Government Licence v3.0.
Official tidal predictions for French ports
Rights holderService hydrographique et océanographique de la marine (SHOM)
LicenceVolgens de voorwaarden van SHOM
Required attributionSource: SHOM — api-maree.fr.
Measured water levels on German waterways and coast
Rights holderWasserstraßen- und Schifffahrtsverwaltung des Bundes (WSV)
Required attributionDatenquelle: Wasserstraßen- und Schifffahrtsverwaltung des Bundes (WSV), PEGELONLINE.
Weather, wind and waves
Wave height and period, currents, sea level
Rights holderEuropean Union — implemented by Mercator Ocean International
Required attributionGenerated using E.U. Copernicus Marine Service Information
Wave height, period and direction (northern North Sea and Norwegian Sea)
Rights holderMeteorologisk institutt (MET Norway)
Required attributionData from MET Norway (Norwegian Meteorological Institute), WAVEWATCH III 4km, via thredds.met.no. Licensed under NLOD 2.0 / CC BY 4.0.
Wind, waves and pressure from the IFS model
Rights holderEuropean Centre for Medium-Range Weather Forecasts
Required attributionContains modified ECMWF open data
Wind, gusts, temperature, pressure, precipitation and cloud cover from a locally held grid
Rights holderDeutscher Wetterdienst (DWD)
Required attributionDatenbasis: Deutscher Wetterdienst, eigene Elemente ergänzt
Wind, gusts, temperature, pressure, precipitation and cloud cover at ~2 km for the southern North Sea
Rights holderRoyal Netherlands Meteorological Institute (KNMI)
Required attributionSource: KNMI
Shipping forecast for the North Sea districts, the Dutch continental shelf and the coastal districts
Rights holderRoyal Netherlands Meteorological Institute (KNMI)
Required attributionSource: KNMI
Additional weather models for positions outside our own grids
Rights holderOpen-Meteo, op basis van nationale weerdiensten
Required attributionWeather data by Open-Meteo.com (CC BY 4.0)
Precipitation and observations for the Netherlands
Rights holderBuienradar / RTL
Wave height, sea level and currents for the North-West European Shelf (~1.5 km)
Rights holderMet Office (Verenigd Koninkrijk)
Required attributionContains Met Office data licensed under the Open Government Licence v3.0.
Observations from UK buoys and light vessels, and the UK rainfall radar composite
Rights holderMet Office (Verenigd Koninkrijk)
Required attributionContains Met Office data licensed under the Open Government Licence v3.0.
Waves, currents and ocean observations for the Baltic Sea
Rights holderSveriges meteorologiska och hydrologiska institut (SMHI)
Required attributionBron: SMHI.
MFWAM wave model, AROME weather model and the French rainfall radar composite
Rights holderMétéo-France
Required attributionSource: Météo-France.
Observations from German stations in the North Sea and Baltic
Rights holderBundesamt für Seeschifffahrt und Hydrographie (BSH)
LicenceVolgens de voorwaarden van het BSH
Required attributionDatenquelle: Bundesamt für Seeschifffahrt und Hydrographie (BSH).
Wave, wind and water level measurements for the Belgian coastal zone
Rights holderVlaamse Overheid — Agentschap Maritieme Dienstverlening en Kust (MDK), afdeling Kust
LicenceVolgens de voorwaarden van Meetnet Vlaamse Banken
Required attributionBron: Meetnet Vlaamse Banken (Vlaamse Overheid, afdeling Kust).
Measurements from French wave buoys
Rights holderCEREMA (Frankrijk)
Required attributionSource: CEREMA — CANDHIS.
Netherlands rainfall radar composite
Rights holderRoyal Netherlands Meteorological Institute (KNMI)
Required attributionBron: KNMI.
Polish coastal and station measurements
Rights holderInstytut Meteorologii i Gospodarki Wodnej — PIB (Polen)
LicenceVolgens de voorwaarden van IMGW-PIB
Required attributionŹródło: IMGW-PIB.
Latvian coastal and station measurements
Rights holderLatvijas Vides, ġeoloģijas un meteoroloģijas centrs (LVĢMC)
LicenceVolgens de voorwaarden van LVĢMC
Required attributionAvots: LVĢMC.
Estonian coastal and station measurements
Rights holderRiigi Ilmateenistus (Estland)
LicenceVolgens de voorwaarden van Riigi Ilmateenistus
Required attributionAllikas: Riigi Ilmateenistus.
Space weather and GNSS
Kp index, solar wind, radio blackouts
Rights holderNational Oceanic and Atmospheric Administration (VS)
Required attributionSpace weather data: NOAA/NWS Space Weather Prediction Center
Display of GNSS interference
Rights holderGPSJam
Shipping
Vessel positions and aids to navigation (AIS)
Rights holderAISStream.io
Required attributionAIS data provided by AISStream.io
Additional AIS messages (second stream)
Rights holderAISHub
LicenceVolgens de voorwaarden van AISHub (uitwisseling van feeds)
Required attributionBron: AISHub.
Map material
Underlying map data
Rights holderOpenStreetMap contributors
Required attribution© OpenStreetMap contributors
Voyager base map
Rights holderCARTO
Required attribution© OpenStreetMap contributors © CARTO
Ocean base map
Rights holderEsri and partners
Required attributionEsri, GEBCO, NOAA, National Geographic, Garmin, HERE, Geonames.org and other contributors
Nautical marks layer (SeaMarks)
Rights holderOpenSeaMap contributors
Required attribution© OpenSeaMap contributors
Topo base map
Rights holderOpenTopoMap
Required attributionKartendaten: © OpenStreetMap contributors, SRTM | Kartendarstellung: © OpenTopoMap (CC-BY-SA)
Software
Map rendering in the browser
Rights holderVolodymyr Agafonkin and contributors
Charts
Rights holderChart.js contributors
Astronomical arguments for tidal computation
Rights holderTyler Sutterley and contributors
Sun and moon positions
Rights holderSimon Kennedy
