I try to create an Auto-complete polygon within a bigger frame (from the same layer), using frame's border. The thing is that when I try to create it outside the frame, the polygon appear but when I'm trying to do inside, it doesn't work. I tried many times and every time, outside it worked and outside,no.



outside result

Why is this situation ? What can I do in order to succeed making autocomplete polygons inside the frame?


Auto-complete Polygon fills gaps with new polygons. They only work where there is no existing polygon.

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Where there are existing polygons, the auto-complete polygon tool will not create any polygons.

This will not create a polygon as there is no gap:

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No polygon created:

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In fact, the tool needs to actually cross an area where there is no existing polygon in order to create a polygon there. If I have a hole which I fully surround by my auto-complete polygon sketch, but without crossing any of the gap, no polygon will be created.

This will not auto-complete any polygon:

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However this will, as it crosses the gap:

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  • Great, man. It worked. – Sam Lee Apr 19 '17 at 11:57

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