Re: [Geotools-gt2-users] judging whether a point is inside a Geometry

[Jody G. <jod...@gm...>]

Contains or within 
- http://tsusiatsoftware.net/jts/javadoc/com/vividsolutions/jts/geom/Geometry.html#contains(com.vividsolutions.jts.geom.Geometry)

If you have a bunch to test use a prepared geometry for speed (so it does not have to recreate the edge graph each time). For a discussion see here:
- http://docs.geotools.org/latest/userguide/library/jts/dim9.html#preparedgeometry

Also there *just* point in polygon you can use the class directly:
- IndexedPointInAreaLocator (http://tsusiatsoftware.net/jts/javadoc/com/vividsolutions/jts/algorithm/locate/IndexedPointInAreaLocator.html)

Also note that the same relationship (ie contains) can be used with a GeoTools Query when asking for polygons from a feature source.

See the "Use a point for to Check Polygon Layers" example here:
- http://docs.geotools.org/latest/userguide/library/main/filter.html (it includes pictures of what is going on)

-- 
Jody Garnett


On Monday, 11 July 2011 at 7:07 AM, Ted Yu wrote:

> I went over the methods in Geometry interface and didn't find a method which can tell whether a point is inside a Geometry.
> 
> How can I do that ?
> 
> Thanks
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