[R-sig-Geo] Clearing the area outside of a polygon defined on a grid.

[peleve]

Thanks Robert,
I was able to do it with the following using the 'gpclib" package:

p2 <- as(xy, "gpc.poly")
p1 <- as(maparea, "gpc.poly")
plot(setdiff(p1, p2), poly.args = list(col = 3), add = TRUE)

Did exactly what I was looking for.  Pretty simple, actually.

Thanks for inspiring me.

Pete




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