The app which I'm planning will allow people to draw polygons of
various sizes on the map.  For example, you could draw around the
state of Texas and the city of Dallas.

This gives problems if Texas loads on top of Dallas, because every
click on Dallas will, I presume, be intercepted by the Texas overlay.

My idea was to sort the polygons by size and load the largest ones
first, in the hope that Dallas will be "on top of" Texas.  Is this
necessary?  Is it sufficient?  Or do I need to investigate layers?

Thanks
Nick

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