Class DistanceOp

Computes the distance and closest points between two Geometrys. The distance computation finds a pair of points in the input geometries which have minimum distance between them. These points may not be vertices of the geometries, but may lie in the interior of a line segment. In this case the coordinate computed is a close approximation to the exact point.

Empty geometry collection components are ignored.

The algorithms used are straightforward O(n^2) comparisons. This worst-case performance could be improved on by using Voronoi techniques.

Inheritance

object

DistanceOp

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: NetTopologySuite.Operation.Distance

Assembly: NetTopologySuite.dll

Syntax

public class DistanceOp

Constructors

DistanceOp(Geometry, Geometry)

Constructs a DistanceOp that computes the distance and closest points between the two specified geometries.

Declaration

public DistanceOp(Geometry g0, Geometry g1)

Parameters

Type	Name	Description
Geometry	g0	A geometry
Geometry	g1	A geometry

DistanceOp(Geometry, Geometry, double)

Constructs a DistanceOp that computes the distance and closest points between the two specified geometries.

Declaration

public DistanceOp(Geometry g0, Geometry g1, double terminateDistance)

Parameters

Type	Name	Description
Geometry	g0	A geometry
Geometry	g1	A geometry
double	terminateDistance	The distance on which to terminate the search.

Methods

Distance()

Report the distance between the closest points on the input geometries.

Declaration

public double Distance()

Returns

Type	Description
double	The distance between the geometries or 0 if either input geometry is empty.

Exceptions

Type	Condition
ApplicationException	if either input geometry is null

Distance(Geometry, Geometry)

Compute the distance between the closest points of two geometries.

Declaration

public static double Distance(Geometry g0, Geometry g1)

Parameters

Type	Name	Description
Geometry	g0	A Geometry.
Geometry	g1	Another Geometry.

Returns

Type	Description
double	The distance between the geometries.

IsWithinDistance(Geometry, Geometry, double)

Test whether two geometries lie within a given distance of each other.

Declaration

public static bool IsWithinDistance(Geometry g0, Geometry g1, double distance)

Parameters

Type	Name	Description
Geometry	g0
Geometry	g1
double	distance

Returns

Type	Description
bool

NearestLocations()

Report the locations of the nearest points in the input geometries. The locations are presented in the same order as the input Geometries.

Declaration

public GeometryLocation[] NearestLocations()

Returns

Type	Description
GeometryLocation[]	A pair of GeometryLocations for the nearest points.

NearestPoints()

Report the coordinates of the nearest points in the input geometries. The points are presented in the same order as the input Geometries.

Declaration

public Coordinate[] NearestPoints()

Returns

Type	Description
Coordinate[]	A pair of Coordinates of the nearest points.

NearestPoints(Geometry, Geometry)

Compute the the closest points of two geometries. The points are presented in the same order as the input Geometries.

Declaration

public static Coordinate[] NearestPoints(Geometry g0, Geometry g1)

Parameters

Type	Name	Description
Geometry	g0	A Geometry.
Geometry	g1	Another Geometry.

Returns

Type	Description
Coordinate[]	The closest points in the geometries.