[R-sig-Geo] Determine if a line segment intersects a polygon

[Roger Bivand]

On Fri, 10 Aug 2007, Waichler, Scott R wrote:

> I am looking for a method that would determine whether any part of a
> line segment defined by (x0, y0) and (x1, y1) intersects a given polygon
> (true or false).  I don't have any other geospatial needs here, so if a
> solution exists using base R that would be great.

Perhaps look at crossing.psp() in the spatstat package - there are lots of 
useful functions there.

Roger

>
> Thanks,
> Scott Waichler
> Pacific Northwest National Laboratory
> scott.waichler _at_ pnl.gov
>
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>

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no