Method BufferGeodetic

BufferGeodetic(Geometry, Double, LinearUnit, Double, GeodeticCurveType)

Calculates the geodesic buffer of a given geometry.

Declaration

public static Geometry BufferGeodetic(this Geometry geometry, double distance, LinearUnit unit, double maxDeviation = NaN, GeodeticCurveType geodeticCurveType = GeodeticCurveType.Geodesic)

Parameters

Type	Name	Description
Geometry	geometry	The geometry to buffer. A non-null spatial reference is required.
System.Double	distance	The distance to buffer.
LinearUnit	unit	The unit of measure for the distance.
System.Double	maxDeviation	The maximum deviation between points.
GeodeticCurveType	geodeticCurveType	The curve type to calculate.

Returns

Type	Description
Geometry	The Polygon that represents the buffered area.

Remarks

Geodesic buffers account for the actual shape of the Earth. Distances are calculated between two points on a curved surface (the geoid) as opposed to two points on a flat surface (the Cartesian plane).

Negative distance can be used to create buffers inside a Polygon or an Envelope. Using a negative buffer distance shrinks the geometry's boundary by the distance specified. Note that if the negative buffer distance is large enough, the geometry may collapse to an empty polygon.

Supports true curves as input, and may produce a densified curve as output.

Applies to

Platforms and versions

Target	Versions
.NET Standard 2.0	100.3 - 200.5
.NET	100.13 - 200.5
.NET Windows	100.13 - 200.5
.NET Android	200.0 - 200.5
.NET iOS	200.0 - 200.5
.NET Framework	100.0 - 200.5
Xamarin.Android	100.0 - 100.15
Xamarin.iOS	100.0 - 100.15
UWP	100.0 - 200.5

Relevant samples

Buffer: Create a buffer around a map point and display the results as a `Graphic`

Route around barriers: Find a route that reaches all stops without crossing any barriers.

BufferGeodetic(IEnumerable<Geometry>, IEnumerable<Double>, LinearUnit, Double, GeodeticCurveType, Boolean)

Creates and returns a geodesic buffer or buffers relative to the given collection of geometries.

Declaration

public static IEnumerable<Geometry> BufferGeodetic(IEnumerable<Geometry> geometries, IEnumerable<double> distances, LinearUnit distanceUnit, double maxDeviation = NaN, GeodeticCurveType curveType = GeodeticCurveType.Geodesic, bool unionResult = false)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<Geometry>	geometries	A collection of geometries.
System.Collections.Generic.IEnumerable<System.Double>	distances	The distance to buffer each geometry, expressed as a sequence of doubles. If the size of the distances collection is less than the number of geometries, the last distance value is used for the rest of geometries.
LinearUnit	distanceUnit	The unit of measure for the distance.
System.Double	maxDeviation	The maximum deviation between points. If System.Double.NaN then a maximum deviation of up to 0.2% of the buffer distance, with a maximum of 0.01 meters, aiming to give an output geometry with a smooth boundary.
GeodeticCurveType	curveType	The GeodeticCurveType used to calculate the buffer.
System.Boolean	unionResult	Return a single geometry that buffers all the geometries (true), or one buffer for each in the given collection (false).

Returns

Type	Description
System.Collections.Generic.IEnumerable<Geometry>	A collection of polygon geometries that represent a geodesic buffer at the desired distance(s) relative to the given geometries. If unionResult is true, the resulting collection contains a single polygon. If geometries is empty, returns an empty enumerable.

Remarks

Geodesic buffers account for the actual shape of the Earth. Distances are calculated between two points on a curved surface (the geoid) as opposed to two points on a flat surface (the Cartesian plane).

Negative distances can be used to create buffers inside polygons. Using a negative buffer distance shrinks the polygons' boundaries by the distance specified. Note that if the negative buffer distance is large enough, polygons may collapse to empty geometries.

Applies to

Platforms and versions

Target	Versions
.NET Standard 2.0	100.3 - 200.5
.NET	100.13 - 200.5
.NET Windows	100.13 - 200.5
.NET Android	200.2 - 200.5
.NET iOS	200.0 - 200.5
.NET Framework	100.1 - 200.5
Xamarin.Android	100.1 - 100.14
Xamarin.iOS	100.1 - 100.15
UWP	100.1 - 200.5