[R] calculate area between intersecting polygons

[Remko Duursma]

Here is a different solution:

library(gpclib)
p1 <- as(poly1, "gpc.poly")
p2 <- as(poly2, "gpc.poly")

area.poly(p2) + area.poly(p1) - area.poly(union(p1,p2))


I.e., take areas of both polygons and subtract the union (check
plot(union(p1,p2)) ) to get the area of the intersection.


greetings,
Remko
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