Generates SVG maps (and ultimately PNGs for anki-ultimate-geography) mainly using shapefiles from Natural Earth Data. The style of the maps was intended to follow that of the Locator Maps on Wikimedia (e.g. Belarus in its region).
The data for the Celtic Sea and the English Channel are from International Hydrographic Organization, IHO; Sieger, Rainer (2012): Limits of oceans and seas in digitized, machine readable form. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, which is under CC BY 3.0.
npm, gdal-bin, mapshaper, d3-geo-projection
sudo apt install npm gdal-bin
# npm install mapshaper
# npm install d3-geo-projection
# for the versions used currently:
npm install mapshaper@0.5.5 d3-geo-projectionThe code is extremely messy!
The shp files in shp/original/bering_strait.shp were manually edited with QGIS, using Natural Earth Data’s ne_10m_geography_marine_polys.shp as the basis for the US and Russian coastlines and mostly relying on the IHO’s 2002 draft of “Names and Limits of Oceans and Seas” for the northern and southern limits of the strait.
7.9 BERING STRAIT Bering Strait is situated between the north east extremity of Russia and the Seward Peninsula in Alaska. It has the following limits:
On the North: From Mys2 Unikyn (66°22’N – 170°35’W), on the coast of Poluostrov Chukotskiy, a line eastward to the coast of Seward Peninsula at the southern entrance to Shimaref Inlet (66°11’N – 166°14’W) (the common limit with the Arctic Ocean, see 9, and the Chukchi Sea, see 9.10).
On the South: A line from Mys Chaplina (64°50’N – 172°20’W), in Russia, eastwards to Sledge Island (64°30’N – 166°15’W), off the south western coast of the Seward Peninsula in Alaska.
However, since the coordinates of Mys Chaplina (64°50’N – 172°20’W) do not agree with those given on Wikipedia (64°24′17″N 172°13′39″W) or those implied by the map on page 21 of the aforementioned document, I’ve adjusted the south-western vertex to the coordinates given by Wikipedia for Mys Chaplina.
The Baltic Sea (“Pangaea”) SVG was manually modified so that the Szczecin and Curonian Lagoons were excluded, by changing the order of these two elements. (If this type of “exclusion” becomes more frequent I’ll automate it with mapshaper’s -erase feature.)
map_data.json and the images in tests/samples/ are released under CC BY-SA 3.0. All the remaining files are released under the Unlicense.