Hex tile grids for the Earth at various scales, 320km, 220km, 160km, 120km and 80km. The tile grids work the same as normal hex grids from in
the Tiling module, except they have to be joined togethor at the 15, 45, 75 degree longitude boundaries.
A = 3 * √3 * R² / 2 //Where A is area
and R is both the long radius and side length of the regualar hexagon.
R = 2 * r / √3 = d / √3 //Where r is the short radius and d is the
short diameter or hex scale.
R² = d² / 3
A = √3 * d² / 2
A = 0.8660254037844386 * d²
MIA = A/6 //where MIA is minimum island
area.
MIA = 0.14433756729740643 * d²