Class SnappingNoder

Nodes a set of segment strings snapping vertices and intersection points together if they lie within the given snap tolerance distance. Vertices take priority over intersection points for snapping. Input segment strings are generally only split at true node points (i.e.the output segment strings are of maximal length in the output arrangement).

The snap tolerance should be chosen to be as small as possible while still producing a correct result. It probably only needs to be small enough to eliminate "nearly-coincident" segments, for which intersection points cannot be computed accurately. This implies a factor of about 10e-12 smaller than the magnitude of the segment coordinates.

With an appropriate snap tolerance this algorithm appears to be very robust. So far no failure cases have been found, given a small enough snap tolerance.

The correctness of the output is not verified by this noder. If required this can be done by ValidatingNoder.

Inheritance

object

SnappingNoder

Implements

INoder

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: NetTopologySuite.Noding.Snap

Assembly: NetTopologySuite.dll

Syntax

public sealed class SnappingNoder : INoder

Constructors

SnappingNoder(double)

Creates a snapping noder using the given snap distance tolerance.

Declaration

public SnappingNoder(double snapTolerance)

Parameters

Type	Name	Description
double	snapTolerance	Points are snapped if within this distance

SnappingNoder(double, ElevationModel)

Creates a snapping noder using the given snap distance tolerance.

Declaration

public SnappingNoder(double snapTolerance, ElevationModel em)

Parameters

Type	Name	Description
double	snapTolerance	Points are snapped if within this distance
ElevationModel	em	An elevation model. May be null

Methods

ComputeNodes(IList<ISegmentString>)

Computes the noding of a set of ISegmentStrings

Declaration

public void ComputeNodes(IList<ISegmentString> inputSegmentStrings)

Parameters

Type	Name	Description
IList<ISegmentString>	inputSegmentStrings	A Collection of ISegmentStrings

GetNodedSubstrings()

Returns a IList<T> of fully noded ISegmentStrings. The ISegmentStrings have the same context as their parent.

Declaration

public IList<ISegmentString> GetNodedSubstrings()

Returns

Type	Description
IList<ISegmentString>

Implements

INoder