Perturbing the mask has made the arrowhead shape less obvious and the overall shape of the peninsula islands more natural and organic. Now that candidate align the peninsula invent
I can create an island chain, the next step is to identify peninsulas on the map and figure out how to properly mask with the peninsula. Sadly, the research field of identification seems to be moribund, so I was forced to my own algorithm.
A peninsula is a point on the coast line where the land bulges out into the sea. To detect these spots, I slide 2 points (Beginning and End) along the coast line, keeping them a fixed distance along the coast apart. At each step, I check whether the midpoint of the line between Beginning and End is over land. For example:
124