Middle-Earth is fictional. Everyone knows that.

Honestly this one leaves out more than it leaves in.

I was going to suggest Tassie is also classically missing but the entirety of SE Asia isn't on this one

c/MapsWithMadagascar

And the big one that's dead center is mostly useless

Africa needs to be enlarged quite a bit and there’s a whole continent missing. Not bad otherwise.

Can't believe you forgot New Zealand smh

I feel a tingling in my hands. An algorithm to optimize for n arbitrary polygons

Apparently I am a fool.

What you'd do is, you pick a representative set of points from a world map, e.g. by reducing it to a low resolution, or by sampling with blue noise. Each point gets a 32-bit integer. For up to 32 circles, you check if each point is inside or outside the circle, and mark one bit accordingly. Every region created by these overlapping circles now has a unique ID for all points inside that region.

Scoring groups points by ID, finds whether each group contains more land or water points, and counts all the points outside that majority. That sum is your error.

I would also add one more to NA to make it as wide as it should be. It's pretty skinny here.