@lolcat No idea! I assume a lot of coastline data comes from government survey data, at varying degrees of detail and accuracy. Part of the challenge of coastline representation, I'm told, is how to simplify the geometry as you zoom out without it looking weird or distorting shapes. Like, at what zoom level do you replace a cove with just a straight line? Last time I looked at this people had genuinely spent 10y of research on just that question, and it's still not fully solved.
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