Platforms and pipelines appear as you zoom in.
Each producing field is a circle. In Rate, its area and its color are what the field produced in the month on the player, that month’s volume divided by its days; color runs on a log scale over three and a half decades below the scale’s top, area by the square root, and both stop growing at the legend’s open top end. So that a small producer stays in sight, a circle is never drawn under 3.2 px across, except inside a ring: there it is drawn at its true size however small, so the ring never looks fuller than the field is. In Cumulative, they are what the field has produced from the start of its regulator’s series to that month. A field shared across a median line is one circle, each side reported by its own regulator and never counted twice.
Around each circle, in Rate, a thin ring marks the field’s best month so far: the largest monthly rate the regulator reports for it, up to the month shown, drawn at the circles’ own scale. A field still rising fills its ring; one past its best sits small inside it; one that has stopped leaves its ring empty. A ring is a best month in the regulator’s series and no more. A field whose series starts late may have had a better month the ring cannot show (the Dutch series start in January 2003 and the UK series in June 1975). Danish figures before January 2018 are each year’s total spread evenly over its months, so a Danish ring from then is a year’s average. One UK field, Tern, reports two months of gas in 2000 far above the rest of its life, and its gas ring keeps them as reported. Fields whose best month never reached 3.1 % of the scale’s top get no ring, since it would be smaller than 3 px. A ring says nothing about what is left in the ground.
Outlines say where a field is and its state, not how much it produces: tinted while it produces, gray once it has shut down. Danish outlines are the Energy Agency’s legal field delineations, drawn dashed. A month a country has not reported yet draws its fields as outlines without a circle, and the line under the map says which country is missing. The depth shading is EMODnet’s mean depth, for orientation only. Play runs a year a second and stops at the newest month every country shown has reported.
Type: Ysabeau Office by Christian Thalmann (Catharsis Fonts), SIL Open Font License 1.1; a subset is in fonts/ with its license.
A weekly build fetches the regulators’ open data and writes data/geo.json, data/snapshot.json and data/bathy.png. A scheduled refresh replaces data/snapshot.json, the file with the figures. The map re-reads both files every time it is opened and whenever new data lands while it is open; the app itself never goes online.