Make polygon from area not covered by loaded polygons (like invert selection)

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See screenshot, from geojson.io, with a geojson file loaded:


So how do we make a polygon out of the blank area? Looking for a way which doesn't involve manually copying selected sequences of co-ordinates from each enclosing polygon's edge. But if we can automate that, awesome!

Obviously the solution would involve specifying a bounding box limit, so we don't polygon the planet.

Some kind of proximity detection could be a way to go : enlist lines (ie, pair of sequential co-ordinates) which don't have any close-by counterparts in the other polygons loaded. Just an idea.

Guess I'm wishing for an "invert selection" like feature ;)



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