Geometry.Touches

Geometry.Touches method

Determines if this geometry and a specified geometry touch.

public bool Touches(IGeometry other)

Parameter	Type	Description
other	IGeometry	A geometry.

Return Value

true if this geometry is “spatially touches” another geometry. false otherwise.

Exceptions

exception	condition
ArgumentNullException	Argument is `null`.
ArgumentException	One of the geometries is invalid in such way that operation can not be finished.
ArgumentException	`SpatialReferenceSystem` of geometries are not equivalent. You can use `SpatialReferenceSystemTransformation` in order to convert geometries to the same spatial reference system.

Remarks

This method tests whether geometries touch each other in terms of DE-9IM intersection matrix. Two geometries touch each other if they have at least one boundary point in common, but no interior points. That is: two LineStrings touch each other if they share an endpoint, but don’t share a segment, two polygons touch each other if they share part of exterior or interior ring, but their interiors don’t overlap. This method is equivalent to:

this.Relate(other, "FT*******") || this.Relate(other, "F**T*****") || this.Relate(other, "F***T****");

See OpenGIS Simple Features Specification for more details about DE-9IM and “spatially touches” relation.

Geometry.Touches