I think you may be looking at a "clipping operation" then.

You will want to loop over each road; you can perform a union with your polygon to get just the section of the road that is inside the polygon.

-- 
Jody Garnett

On Friday, 1 April 2011 at 2:06 AM, mounir younes wrote:

I have tested coveredBy, intersects, within, and contains and they all fail.

 What I have is a set of line strings over a polygon and I want to delete linestrings that are outside of the polygon ! how do I do that ?

Attached is the picture of my problem. In other words I want the parts of the roads outside the polygon to disappear? should I loop over each part of each road?

On Thu, Mar 31, 2011 at 4:52 PM, Jody Garnett <jody.garnett@gmail.com> wrote:
This is another case where reading the javadocs should I hope help?

Both contain and within have some funny language about if the linestring touches the "edge" of your polygon.

You may want to try the jts coveredBy as an alternative? (and are you sure you are not trying to test intersects? - ie test if any part of the linestring is inside the polygon?)

Finally if none of the out of the box methods work for you; you can say exactly what you need:

-- 
Jody Garnett

On Thursday, 31 March 2011 at 11:16 PM, mounir younes wrote:

I want to check if a linestring is inside a polygon ! how can I do t that? I tried .contains and .within but both failed !! can someone help me
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