Third-Party Attribution

Leaflet

ODINN AIS uses Leaflet (v1.9.4), an open-source JavaScript library for interactive maps.

Copyright © 2010–2024 Vladimir Agafonkin. Copyright © 2010–2011 CloudMade.

Map tiles

Base map and satellite imagery tiles are served by Esri, drawing on HERE, Garmin, USGS, Intermap, Vantor, Earthstar Geographics and other contributors. The exact credit for each layer is shown in the corner of every map view.

Esri's street and topographic basemaps incorporate OpenStreetMap data, which is made available under the Open Database Licence (ODbL). You are free to copy, distribute, transmit, and adapt OpenStreetMap data, as long as you credit OpenStreetMap and its contributors; derivative databases must carry the same licence.

ODINN does not draw tiles from the OpenStreetMap Foundation's volunteer-run tile servers. Their tile usage policy reserves those servers for low-volume use and excludes commercial services.

Weather observations

Observed weather on the weather map comes from the Icelandic Meteorological Office (Veðurstofa Íslands) public observation API at api.vedur.is, covering roughly 330 automatic and manned stations.

Tilvísun / Citation

Veðurathuganir frá sjálfvirkum stöðvum og skeytastöðvum frá Veðurstofu Íslands. Gefið út samkvæmt CC BY 4.0.
Gögnunum hefur verið breytt af ODINN AIS. Veðurstofa Íslands ber ekki ábyrgð á þeirri vinnslu eða túlkun.
Rauntímamælingar eru bráðabirgðagögn sem hafa ekki verið gæðaprófaðar og geta breyst án fyrirvara.
Niðurhalstími gagnanna er sýndur á kortinu sjálfu („sótt …“) og uppfærist á tíu mínútna fresti.

The data is published under the Creative Commons Attribution 4.0 International licence (CC BY 4.0), in accordance with Icelandic law 45/2018 on the re-use of public information. Commercial use is permitted provided the source, dataset, licence and date of downloading are stated. ODINN mirrors the feed into its own database every ten minutes and serves the map from there, so viewing the map places no load on IMO's servers. The download time is shown on the map beside the credit and in every station popup.

Changes ODINN makes to the data

IMO's terms permit their data to be altered only where the change is stated clearly. Between the IMO feed and the screen, ODINN:

• Mæligildi eru námunduð til birtingar (t.d. hiti og vindur í einn aukastaf).
• Aðeins hluti mælibreyta er birtur og aðeins stöðvar sem eru í rekstri.
• Reiknað er út aldur mælingar og hvort hún telst úrelt, og vindhraða er raðað í veðurflokka Veðurstofunnar.
• Athuganir eldri en 30 klst eru ekki geymdar.

Gögnunum hefur verið breytt af ODINN AIS. Veðurstofa Íslands ber ekki ábyrgð á þeirri vinnslu eða túlkun.
ODINN AIS is responsible for this processing. Veðurstofa Íslands is not responsible for it, nor for any interpretation drawn from it.

Rauntímamælingar eru bráðabirgðagögn sem hafa ekki verið gæðaprófaðar og geta breyst án fyrirvara.

Real-time observations are preliminary: they are published before quality control and may be revised or withdrawn without notice. IMO does not guarantee that the data is available, up to date, or fit for any particular purpose, and accepts no liability for loss arising from its use. Data quality varies with the origin of each station.

These are measurements, not forecasts, and every station popup states both the time its reading was taken and the time ODINN downloaded it. All times are UTC, which is also Icelandic local time. Full terms: IMO open-data terms and IMO website conditions. See also the ODINN disclaimer.

Tide predictions

The tide layer on the live map shows predicted high and low water for five harbours on the east coast. The predictions come from tide.is, which publishes the Icelandic Coast Guard's (Landhelgisgæsla Íslands) tide tables. The tables themselves rest on tidal constants from DGFI-TUM's TICON-4 dataset, released under CC BY 4.0.

Required credits

• Tide data from tide.is
• Landhelgisgæsla Íslands — sjávarfallatöflur
• DGFI-TUM TICON-4 (CC BY 4.0)

These are predictions, not measurements

Stjarnfræðileg spá, ekki mæling. Staða milli flóðs og fjöru er reiknuð. Veður og vindur breyta raunhæð. Ekki til nota við siglingar.

Two things about the numbers on screen have to be said plainly, and are said in every station popup as well as here.

First, the published data is extremes only — four high and low waters a day, and nothing between them. Every height ODINN shows between two of them, including the figure on the marker and the curve on the chart, is interpolated by ODINN as a half-cosine between the bracketing pair. That is the standard shape of a harmonic tide and what the "rule of twelfths" approximates, but it is our arithmetic, not the source's.

Second, none of these harbours has a gauge of its own. Every one is measured: false in the source data — computed from Reykjavik using the official time differences. Each popup prints the harbour's offset from Reykjavik, which ODINN derives at sync time by comparing high waters, and refuses to print when the comparison cannot be trusted.

Astronomical predictions describe the tide-generating forces alone. Weather, barometric pressure and wind routinely move the real water level away from them. Not for navigation — see the ODINN disclaimer.

Harbours shown

• Djúpivogur
• Stöðvarfjörður
• Fáskrúðsfjörður
• Eskifjörður — also stands for Reyðarfjörður, which tide.is does not publish; the two are about 10 km apart in the same fjord system
• Seyðisfjörður

tide.is asks callers to fetch sparingly, as the data does not change during a day. ODINN mirrors each harbour's predictions into its own database once a day and serves the map from there, so viewing the map places no load on tide.is at all.

Algae screening (Þörungar)

The Þörungar page screens Icelandic waters within 30 NM of the baselines every day for unusual chlorophyll — possible algal blooms — with sea temperature, suspended matter, surface currents and depth for context. ODINN mirrors the data into its own database twice a day and serves the page from there.

Required credits

• Generated using E.U. Copernicus Marine Service Information: marine.copernicus.eu. Chlorophyll (Sentinel-3 OLCI, ~300 m) and suspended matter (~4 km), near-real-time and multi-year ocean colour products; sea temperature and currents from the global physics analysis and forecast model.
• "IS 50V Strandlína" and "Landshlutar" by Náttúrufræðistofnun (formerly Landmælingar Íslands), licensed under CC BY 4.0.
• Territorial sea 12 NM line, contiguous zone 24 NM, exclusive economic zone, baselines, depth contours and depth areas: Landhelgisgæsla Íslands (Icelandic Coast Guard), served by gis.lmi.is. Limits under law no. 41/1979.
• Urban localities (þéttbýlisstaðir): Hagstofa Íslands (Statistics Iceland), served by gis.lmi.is.
• Open public data re-used under law no. 45/2018 on the re-use of public information. With thanks to Náttúrufræðistofnun, Landhelgisgæsla Íslands and Hagstofa Íslands.

What ODINN does to the data

Cloud gaps are filled per cell from passes up to 7 days old; cells within 0.5 km of land and values above 50 mg/m³ are removed; a hotspot is a patch of at least 10 km² where chlorophyll is at least twice, at least 1 mg/m³ above, and 2 standard deviations (log10) above the cell's own 60-day baseline ending 14 days earlier — after Stumpf, R.P. et al. (2003), Harmful Algae 2: 147–160. The 30 NM zone is ODINN's construction: the 12 NM area widened by 18 NM in a Lambert conic projection with ISN93 parameters. Region, nearest town, depth band and distance to coast are added from the layers above.

Satellite screening, not a warning. It shows where chlorophyll is unusually high, not which species is present or whether it is harmful; the thresholds have not yet been calibrated against local water samples. Confirm anything that matters with a water sample — see the ODINN disclaimer.

Seamark data

The charted seamarks layer — lighthouses, beacons, buoys, wrecks and harbours — is derived from OpenStreetMap data tagged under the seamark:* scheme, contributed by the OpenSeaMap community. OpenStreetMap data is made available under the Open Database Licence (ODbL); credit is given to OpenStreetMap and its contributors, and derivative databases must carry the same licence.

ODINN holds a periodic snapshot of this data in its own database and serves the marks from there. No seamark is fetched from a third-party server while you use the map, and no tiles are drawn from OpenSeaMap's volunteer infrastructure.

Much of the light data for Icelandic waters originates in US NGA Publication 115 and may be more than a decade old. Each mark's popup names its recorded source. These marks are navigational context only — see the disclaimer.

Maki Icon Set

Map marker icons are sourced from the Maki icon set by Mapbox. Maki is dedicated to the public domain under the CC0 1.0 Universal licence — no attribution is legally required, but is given here as a courtesy.

Django

ODINN AIS is built with Django, a high-level Python web framework. Copyright © Django Software Foundation and individual contributors.

Python

ODINN AIS runs on Python. Copyright © 2001–2024 Python Software Foundation.

pyais

AIS message decoding uses pyais, an open-source Python library for parsing AIS NMEA sentences.