[R-sig-Geo] overlap between shapefiles

[Tom Philippi]

To add to Don's recommendation, after you have the 3rd SpatialPolygons
object of the overlap or intersection, you may need to spTransform() them
to a projection where area makes sense, then use rgeos::gArea to compute
the areas.  Which projections to use depends on the spatial scale and
general location of your rangemaps: there is no single best answer.

Tom 2

On Fri, May 8, 2015 at 12:10 PM, MacQueen, Don <macqueen1 at llnl.gov> wrote:

> In the rgeos package there are  gIntersects() and gIntersection(), that
> might be enough to get you started.
>
> -Don
>
> --
> Don MacQueen
>
> Lawrence Livermore National Laboratory
> 7000 East Ave., L-627
> Livermore, CA 94550
> 925-423-1062
>
>
>
>
>
> On 5/8/15, 10:46 AM, "Karla Shikev" <karlashikev at gmail.com> wrote:
>
> >Dear all,
> >
> >I'd like to take two shapefiles and to calculate the area of overlap based
> >on some world projection. Any suggestions about possible functions?
> >
> >Thanks!
> >
> >Karla
> >
> >       [[alternative HTML version deleted]]
> >
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