Marine Areas/ Ocean Basins (NaturalEarth)

The outline of the marine areas are obtained from Natural Earth. They are automatically downloaded, cached[1] and opened with geopandas. The following marine regions are defined in regionmask:

Ocean basins 1:50m

Import regionmask:

In [1]: import regionmask

Ocean Basins

Warning

natural_earth_v4_1_0.ocean_basins_50 and natural_earth_v5_0_0.ocean_basins_50 do not extend all the way to 180°E (see #410). Please use natural_earth_v5_1_2.ocean_basins_50

Be careful, however, as the regions changed between the natural_earth versions.

In [2]: basins = regionmask.defined_regions.natural_earth_v5_1_2.ocean_basins_50

In [3]: basins
Out[3]: 
<regionmask.Regions 'Natural Earth: ocean basins 50m'>
Source:   http://www.naturalearthdata.com
overlap:  False

Regions:
  0         Arctic Ocean         Arctic Ocean
  1       SOUTHERN OCEAN       SOUTHERN OCEAN
  2 North Atlantic Ocean North Atlantic Ocean
  3  North Pacific Ocean  North Pacific Ocean
  4  South Pacific Ocean  South Pacific Ocean
 ..                  ...                  ...
112           Ungava Bay           Ungava Bay
113         Amazon River         Amazon River
114        Yangtze River        Yangtze River
115       Columbia River       Columbia River
116         Korea Strait         Korea Strait

[117 regions]

In [4]: basins.plot(add_label=False);

Also create a mask for a 1° grid globally:

In [5]: import numpy as np

# create a grid
In [6]: lon = np.arange(0.5, 360)

In [7]: lat = np.arange(89.5, -90, -1)

In [8]: mask = basins.mask(lon, lat)

In [9]: basins.plot(add_label=False);

In [10]: mask.plot(add_colorbar=False);