ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.Geometry Namespace / GeometryEngine Class / Buffer Method / Buffer(Geometry,Double) Method
Specifies the input geometry.
The distance (in the unit of the geometry's spatial reference) to buffer the geometry.
Example Version

Buffer(Geometry,Double) Method
Creates a buffer polygon at the specified distance around the given geometry.
Syntax

Parameters

geometry
Specifies the input geometry.
distance
The distance (in the unit of the geometry's spatial reference) to buffer the geometry.

Return Value

The polygon that represents the buffered area. If the input geometry is empty, then an empty polygon is returned.
Exceptions
ExceptionDescription
Geometry is null.
The method is not implemented for GeometryBag.
The buffer distance must be a valid floating point number.
Remarks
If the buffer distance is zero and the input geometry is a polygon or an envelope, then a polygon created from the input geometry is returned.

If the distance is less than or equal to zero and the input geometry is not a polygon or an envelope, then an empty polygon is returned.

GeometryEngine Buffer

Example
Zoom to a specified point
//Create a point
var pt = MapPointBuilderEx.CreateMapPoint(x, y, 
               SpatialReferenceBuilder.CreateSpatialReference(4326));
//Buffer it - for purpose of zoom
var poly = GeometryEngine.Instance.Buffer(pt, buffer_size);

//do we need to project the buffer polygon?
if (!MapView.Active.Map.SpatialReference.IsEqual(poly.SpatialReference))
{
  //project the polygon
  poly = GeometryEngine.Instance.Project(poly, MapView.Active.Map.SpatialReference);
}

// Must run on MCT.
QueuedTask.Run(() =>
{
  //Zoom - add in a delay for animation effect
  MapView.Active.ZoomTo(poly, new TimeSpan(0, 0, 0, 3));
});
Buffer a MapPoint
// buffer a point
MapPoint pt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0, SpatialReferences.WGS84);
Geometry ptBuffer = GeometryEngine.Instance.Buffer(pt, 5.0);
Polygon buffer = ptBuffer as Polygon;
Buffer a Circular Arc
// create the circular arc
MapPoint fromPt = MapPointBuilderEx.CreateMapPoint(2, 1);
MapPoint toPt = MapPointBuilderEx.CreateMapPoint(1, 2);
Coordinate2D interiorPt = new Coordinate2D(1 + Math.Sqrt(2) / 2, 1 + Math.Sqrt(2) / 2);

EllipticArcSegment circularArc = EllipticArcBuilderEx.CreateCircularArc(fromPt, toPt, interiorPt);

// buffer the arc
Polyline polyline = PolylineBuilderEx.CreatePolyline(circularArc);
Geometry lineBuffer = GeometryEngine.Instance.Buffer(polyline, 10);
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also