Hi,
  Say i have two polygon shape files, A and B. Each one has many polygons.
If we overlay the two layers, we should get three parts generally, PART1
only from A, PART2 only from B, and PART3 from both A AND B.
 In R, how can we get these three parts in shape format?
  Just point me several key functions or a simple example to do it.
  Thanks.

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Jane Chang
Queen's

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