[R-sig-Geo] Re-shape shapefile using another shapefile?

[zhongkui]

Dear List,

 I would like give a example to clearly describe (hopefully) my question. I
have two shapefiles with class of "SpatialPolygonsDataFrame", for example:

Shapefile1 (S1): Australian boundary (land area only)
Shapefile2 (S2): Australian land use type boundary

S2 includes land area and coastal waters, this means both water and land
could be included in one polygon of S2. But I am only interested in the land
area. So, my questions is:

Can S1 be used to re-shape S1 and get a revised S2? And how? Or other
solutions? 

Thanks very much for your help.

Regards,

Zak



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