On Tue, Mar 4, 2014 at 8:40 AM, Jody Garnett <[email protected]> wrote:
> The libraries are not that different, GEOS is a port of JTS after all.
> You may wish to ask on the JTS mailing list for details on how buffer and
> centroid can be used.
>
Jody is spot on, aks on the JTS mailing list.
And yeah, I can confirm it's not specific to WPS, here is a sample self
contained program:
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.Point;
import com.vividsolutions.jts.io.ParseException;
import com.vividsolutions.jts.io.WKTReader;
public class BufferUnbuffer {
public static void main(String[] args) throws ParseException {
Geometry point = new WKTReader().read(" POINT(12 42)");
Geometry buffer = point.buffer(0.0001);
Point centroid = buffer.getCentroid();
System.out.println(centroid);
}
}
The output is: POINT (12 41.99999999999999)
If I had to venture a guess, this is due to Java using IEEE floating point
numbers to the letter,
whilst C compilers have them use whatever precision is available in the
native CPU, and if memory
serves me right, this results in more precision bits added to the
computation (80bits vs 64bits)
Hum... according to this page, Java can still perform calculations with 80
bits, but the final
representation is 64:
http://en.wikipedia.org/wiki/Strictfp
Cheers
Andrea
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