ice_coords and ice_fake are generated from a projected map of southern Ocean sea ice data.
The coords layer is the longitude and latitude values for the centres of the polar cells. This is veyr loosely analogous to the coordinate arrays used by ROMS data, included here for working examples, illustration and code tests.
The proper metadata for these layers is "-3950000, 3950000, -3950000, 4350000 (xmin, xmax, ymin, ymax)"
"+proj=stere +lat_0=-90 +lat_ts=-70 +lon_0=0 +k=1 +x_0=0 +y_0=0 +a=6378273 +b=6356889.449 +units=m +no_defs"