Polygon Class

Print this page
Learn more about Verizon Connect GeoBase.
Get information about the latest release

Represents the physical shape of a closed polygonal area such as a lake or national park. Not to be confused with a Polygon, which is a GIBObject containing geometries, i.e. an array of Geometry objects such as Geometry.Polygons.

Inheritance Hierarchy

SystemObject
Telogis.GeoBase.GeometryGeometry
Telogis.GeoBase.GeometryPolygon

Namespace: Telogis.GeoBase.Geometry
Assembly: geobase.net (in geobase.net.dll) Version: 4.99.0.0

Syntax

Copy

public class Polygon : Geometry

Public Class Polygon
	Inherits Geometry

The Polygon type exposes the following members.

Constructors

	Name	Description
	Polygon(LineString)	Construct a polygon from one or more LineStrings.
	Polygon(String)	Construct a Polygon from WKT.

Top

Properties

	Name	Description
	BoundingBox	Calculates the bounding-box of the polygon. (Overrides GeometryBoundingBox.)
	InnerRings	The holes and islands of a polygon.
	OuterRing	The shell of the polygon. Must be clockwise.
	WKT	The WKT representation of the polygon. (Overrides GeometryWKT.)
	WKTWithZ	The WKT representation of the polygon with Z Level.

Top

Methods

	Name	Description
	Contains	Determines whether the Polygon contains or touches a point.
	DistanceTo	Returns the shortest distance from the given location to the edge of this Polygon, in the specified units. If the given location is inside this Polygon, the distance returned will be zero. This is calculated using the great circle distance.
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetPythagoreanArea	Obsolete.
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	Intersects(BoundingBox)	Determines whether the Polygon intersects, contains, or touches a BoundingBox.
	Intersects(LatLon)	Determines whether the Polygon intersects, contains, or touches a line.
	PythagoreanDistanceTo	Obsolete.
	QuickArea	Calculates a Pythagorean approximation of the area.
	QuickDistanceTo	Returns the Pythagorean distance from the given location to the edge of this Polygon, in the specified units. If the given location is inside this Polygon, the distance returned will be zero. See remarks for comments on the accuracy of this method.
	ToString	Returns a string that represents the current object. (Inherited from Object.)

Top

Remarks

A polygon feature is made up of a number of PolygonRings. The OuterRing property forms the external boundary of the polygon. One or more InnerRings may be specified to add holes or islands within the polygon.

A ring must contain at least 4 points. The first and last points must be equal.

A simple polygon like a lake might only have an OuterRing, which describes the outline of the lake. A lake with an island in the middle of it is represented by a polygon with an OuterRing and an a single InnerRing for the island. Furthermore, A lake with an island with a lake would be represented by a polygon with an OuterRing and two InnerRings.

The winding of polygons is irrelevant, however by convention filled areas are oriented clockwise while holes are oriented counter-clockwise.

Intersecting InnerRings must be merged into a single Ring.

Reference

Telogis.GeoBase.Geometry Namespace