I might be wrong but to me this looks very similar as the input

Yes, but the regions have been assigned distinct numbers. (Looking closely, you'll see that the clump of "B"s in the top right corner is given a different number than the clump of "B"s in the bottom left.)

In reply to Re: Re: Re: Map grid to boundary conversion algorithm by simonm
in thread Map grid to boundary conversion algorithm by Willard B. Trophy

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