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 <[email protected]> wrote: > > This is another case where reading the javadocs should I hope help? > > - > > http://tsusiatsoftware.net/jts/javadoc/com/vividsolutions/jts/geom/Geometry.html > > > > 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: > > - http://docs.geotools.org/latest/userguide/guide/library/jts/dim9.html > > > > -- > > 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 > > > ------------------------------------------------------------------------------ > > > Create and publish websites with WebMatrix > > > Use the most popular FREE web apps or write code yourself; > > > WebMatrix provides all the features you need to develop and > > > publish your website. http://p.sf.net/sfu/ms-webmatrix-sf > > > _______________________________________________ > > > Geotools-gt2-users mailing list > > > [email protected] > > > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users > > > > > > > Attachments: > - .png > >
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