Length3D Method—ArcGIS Pro

Gets the 3D length for a specified geometry.

Syntax

C#
Visual Basic (Declaration)

public double Length3D( 
   Geometry geometry
)

Public Function Length3D( _
   ByVal geometry As Geometry _
) As Double

Parameters

geometry: The input geometry.

Return Value

The calculated length in the same units as the geometry's spatial reference unit. If the geometry is empty, then zero is returned.

Exceptions

Exception	Description
System.ArgumentNullException	Geometry is null.
System.NotImplementedException	The method is not implemented for GeometryBag or Multipatch.
System.InvalidOperationException	The geometry is not Z-Aware.
OperationException	Cannot do 3D operations on curve segments.
GeometryObjectException	Geometry is not a polyline or polygon.

Remarks

The geometry must be z-aware or else an exception is thrown.

Example

MapPoint c1 = MapPointBuilder.CreateMapPoint(1, 2, 3);
MapPoint c2 = MapPointBuilder.CreateMapPoint(4, 2, 4);

// line segment
LineSegment line = LineBuilder.CreateLineSegment(c1, c2);
double len = line.Length;     // = 3
double len3D = line.Length3D;   // = Math.Sqrt(10)

// polyline
Polyline p = PolylineBuilder.CreatePolyline(line);
double p_len = p.Length;        // = len = 3
double p_len3D = p.Length3D;    // = len3D = Math.Sqrt(10)

double ge_len = GeometryEngine.Instance.Length(p);      // = p_len = len = 3
double ge_len3d = GeometryEngine.Instance.Length3D(p);    // = p_len3D = len3D = Math.Sqrt(10)

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

Reference

GeometryEngine Class
GeometryEngine Members