ArcGIS Pro 3.1 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.

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    Buffer(Geometry,Double) Method
    In This Topic
    Creates a buffer polygon at the specified distance around the given geometry.
    Public Overloads Function Buffer( _
       ByVal geometry As Geometry, _
       ByVal distance As Double _
    ) As Geometry


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

    Return Value

    The polygon that represents the buffered area.
    Geometry is null or empty.
    The method is not implemented for GeometryBag.
    The buffer distance must be a valid floating point number.
    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

    Zoom to a specified point
    //Create a point
    var pt = MapPointBuilderEx.CreateMapPoint(x, y, 
    //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);

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3.0 or higher.
    See Also