ice_coords and ice_fake are generated from a projected map of southern Ocean sea ice data.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"