Exact vectorization#20

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AlexeyTrekin wants to merge 3 commits intomasterfrom

exact-vectorization

Commits on Apr 7, 2020

Add a new vectorization method based on rasterio exact pixel-beoundary shape extraction. Not tested.
AlexeyTrekin
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Commits on Apr 8, 2020

change parent search for speedup. still very slow.
AlexeyTrekin
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Fix typo
trekin
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