JTS Topology Suite version 1.12

Class DouglasPeuckerSimplifier

  extended by com.vividsolutions.jts.simplify.DouglasPeuckerSimplifier

public class DouglasPeuckerSimplifier
extends java.lang.Object

Simplifies a Geometry using the standard Douglas-Peucker algorithm. Ensures that any polygonal geometries returned are valid. Simple lines are not guaranteed to remain simple after simplification.

Note that in general D-P does not preserve topology - e.g. polygons can be split, collapse to lines or disappear holes can be created or disappear, and lines can cross. To simplify geometry while preserving topology use TopologyPreservingSimplifier. (However, using D-P is significantly faster).


Constructor Summary
DouglasPeuckerSimplifier(Geometry inputGeom)
Method Summary
 Geometry getResultGeometry()
 void setDistanceTolerance(double distanceTolerance)
          Sets the distance tolerance for the simplification.
 void setEnsureValid(boolean isEnsureValidTopology)
          Controls whether simplified polygons will be "fixed" to have valid topology.
static Geometry simplify(Geometry geom, double distanceTolerance)
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


public DouglasPeuckerSimplifier(Geometry inputGeom)
Method Detail


public static Geometry simplify(Geometry geom,
                                double distanceTolerance)


public void setDistanceTolerance(double distanceTolerance)
Sets the distance tolerance for the simplification. All vertices in the simplified geometry will be within this distance of the original geometry. The tolerance value must be non-negative.

distanceTolerance - the approximation tolerance to use


public void setEnsureValid(boolean isEnsureValidTopology)
Controls whether simplified polygons will be "fixed" to have valid topology. The caller may choose to disable this because: The default is to fix polygon topology.

isEnsureValidTopology -


public Geometry getResultGeometry()

JTS Topology Suite version 1.12