This document is archived and information here might be outdated.  Recommended version.


IInterpolationOp.IDW Method (ArcObjects .NET 10.5 SDK)
ArcObjects Help for .NET developers > ArcObjects namespaces > GeoAnalyst > ESRI.ArcGIS.GeoAnalyst > Interfaces > II > IInterpolationOp Interface > IInterpolationOp.IDW Method (ArcObjects .NET 10.5 SDK)
ArcObjects Library Reference (GeoAnalyst)  

IInterpolationOp.IDW Method

Interpolates using IDW.

[Visual Basic .NET]
Public Function IDW ( _
    ByVal geoData As IGeoDataset, _
    ByVal power As Double, _
    ByVal radius As IRasterRadius, _
    [ByRef barrier As Object] _
) As IGeoDataset

[C#]
public IGeoDataset IDW (
    IGeoDataset geoData,
    double power,
    IRasterRadius radius,
    ref object barrier
);
[C#]

Optional Values

barrier   To indicate that this parameter is undefined, first define a variable object Missing=Type.Missing; then pass this in as ref Missing. 
[C++]
HRESULT IDW(
  IGeoDataset* geoData,
  double power,
  IRasterRadius* radius,
  VARIANT* barrier,
  IGeoDataset** GeoDataset
);

[C++]

Parameters
geoData [in]

  geoData is a parameter of type IGeoDataset
power [in]
  power is a parameter of type double
radius [in]

  radius is a parameter of type IRasterRadius
barrier [optional]
  barrier is a parameter of type VARIANT

  To indicate this parameter is undefined pass a reference to a VARIANT with type VT_ERROR and scode value of DISP_E_PARAMNOTFOUND.
GeoDataset [out, retval]

  GeoDataset is a parameter of type IGeoDataset

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Remarks

geoData

an input FeatureClass or FeatureClassDescriptor containing the points with z values to be interpolated onto a surface Raster

power

exponent of distance. Controls the significance of surrounding points upon the interpolated value. A higher power results in less influence from distant points. It can be any real number greater than zero but the most reasonable results will be obtained using values from 0.5 to 3. A commonly used power is 2

radius

an IRasterRadius indicating the search radius for the input points. The radius distance is specified in map units within which all input sample points will be used to perform interpolation. A commonly used radius is five times the cell size of the output Raster

The object will set and use whatever you set last in your VB script. For example,

set pRad.SetFixed 207.1
set pRad.SetVariable 12
will use the args ... ,SAMPLE,12, ....
set pRad.SetVariable 12
set pRad.SetFixed 207.1
will use the args ... ,RADIUS,207.1, ....

[barrier]

a shapefile containing arcs to be used as a break or limit in searching for the input sample points

See Also

IInterpolationOp Interface