CalculateNonSimpleZs Method (GeometryEngine)

In This Topic

Calculates Z attribute values for each non-simple (NaN) Z-value from existing simple (non-NaN) Z attributes on the specified geometry. The non-simple Z values are obtained by extrapolation/interpolation for polylines and interpolation for polygons.

Syntax

C#
Visual Basic (Declaration)

public Multipart CalculateNonSimpleZs( 
   Multipart multipart,
   double defaultZValue
)

Public Function CalculateNonSimpleZs( _
   ByVal multipart As Multipart, _
   ByVal defaultZValue As Double _
) As Multipart

Parameters

multipart: The polygon or polyline to calculate Z-values for.
defaultZValue: The value to which NaN Z-values that could not be interpolated will be set.

Return Value

A geometry in which each coordinate has a simple (non-NaN) Z value.

Exceptions

Exception	Description
System.ArgumentNullException	Multipart is null or empty.
System.InvalidOperationException	This geometry is not Z-Aware.

Example

Interpolate Z values on a polyline

List<Coordinate3D> coords2 = new List<Coordinate3D>()
{
  new Coordinate3D(0, 0, 0),
  new Coordinate3D(0, 1000, double.NaN),
  new Coordinate3D(1000, 1000, 50),
  new Coordinate3D(1000, 1000, 76),
  new Coordinate3D(0, 1000, double.NaN),
  new Coordinate3D(0, 0, 0)
};

SpatialReference sr = SpatialReferences.WebMercator;

Polyline polyline = PolylineBuilderEx.CreatePolyline(coords2, sr);

// polyline.HasZ = true
// polyline.Points[1].HasZ = true
// polyline.Points[1].Z  = NaN   
// polyline.Points[4].HasZ = true
// polyline.Points[4].Z  = NaN   

Polyline polylineNoNaNZs = GeometryEngine.Instance.CalculateNonSimpleZs(polyline, 0) as Polyline;

// polylineNoNaNZs.Points[1].HasZ = true
// polylineNoNaNZs.Points[1].Z = 25  (halfway between 0 and 50)
// polylineNoNaNZs.Points[4].HasZ = true
// polylineNoNaNZs.Points[4].Z = 38  (halfway between 76 and 0)

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

Reference

GeometryEngine Class
GeometryEngine Members

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