Produce a set of polygons for each region of the map corrected for date line and hemisphere
crossings. Due to the complexity of going around the hemisphere, clip the range.
Consider a polygon that cross both the hemisphere in the north and the date line in the
west (-182 92, -182 88, -178 88, -178 92, -182 92). The result is two polygons: (-180 90, -180
88, -178 88, -178 90, -180 90) (180 90, 180 88, 178 88, 178 90, 180 90)