[R-sig-Geo] Cut SpatialLines into two Lines when intersecting with SpatialPolyon

[Roger Bivand]

On Tue, 3 Jun 2014, Wouter Steenbeek wrote:

> [My apologies if this is a double post. I wrote the first post in HTML, 
> and I think it may not have gotten through.]

Thanks for respecting our guidelines - it is much harder to infect plain 
text, which is why HTML is not welcome.

>
> I have a SpatialLines(DataFrame) (e.g. streets) and 
> SpatialPolygons(DataFrame) (e.g. neighborhoods). When a Line intersects 
> with a polygon boundary, I want to split this Line into two new Lines. 
> So: if a street begins in one neighborhood and ends in another 
> neighborhood, I want to remove the original SpatialLine and replace that 
> by two SpatialLines (streets): one street from the starting point until 
> the intersection with the polygon boundary, and another street from the 
> intersection with the polygon boundary to the original end point.
>
> Can someone give me advice on how to do this?

As in most cases, you will increase your chances of a reply if you provide 
a toy example, for instance using readWKT() in rgeos to generate the 
objects. Probably all you need is in rgeos, but without a toy example, it 
is hard to give advice that isn't more like hand-waving.

Roger

>
> Cheers,
> Wouter
>
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-- 
Roger Bivand
Department of Economics, Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 91 00
e-mail: Roger.Bivand at nhh.no