Discussion
A sliver polygon typically arises when
Answer: C
Correct answer: two versions of the same boundary are overlaid
Where the same line has been digitised twice, or captured from two sources, the two versions differ by a small amount along their length. Overlaying them creates a chain of long thin polygons between the two. They are geometrically valid and analytically meaningless, and they are removed by a tolerance or by snapping the boundaries together first.
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