Simplifies a
Geometry using the Douglas-Peucker algorithm. Ensures that any polygonal geometries returned are valid. Simple lines are not guaranteed to remain simple after simplification. All geometry types are handled. Empty and point geometries are returned unchanged. Empty geometry components are deleted.
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).
KNOWN BUGS
In some cases the approach used to clean invalid simplified polygons can distort the output geometry severely.
See also:
TopologyPreservingSimplifier
Other
version: 1.7
public DouglasPeuckerSimplifier(Geometry inputGeom)
distanceTolerance - distanceTolerance the tolerance to use
Returns:
a simplified version of the geometry
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.
Parameters:
distanceTolerance - 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:
valid topology is not required
fixing topology is a relative expensive operation
in some pathological cases the topology fixing operation may either fail or run for too long