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ISurface.IsVoidZ Method (ArcObjects .NET 10.5 SDK)
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ArcObjects Library Reference (GeoDatabase)  

ISurface.IsVoidZ Method

Returns TRUE if the passed value is equal to the surface's void value.

[Visual Basic .NET]
Public Function IsVoidZ ( _
    ByVal Value As Double _
) As Boolean

[C#]
public bool IsVoidZ (
    double Value
);

[C++]
HRESULT IsVoidZ(
  double Value,
  VARIANT_BOOL* pbIsVoid
);

[C++]

Parameters
Value [in]
  Value is a parameter of type double
pbIsVoid [out, retval]
  pbIsVoid is a parameter of type VARIANT_BOOL

Product Availability

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

Description

Returns TRUE or FALSE depending on whether the specified Z is considered NODATA. Mathmatical operations cannot be performed on NODATA.

Some functions, such as ISurface.GetElevation, return a floating point number representing some characteristic of the surface for a given location. If the location does not fall within the interpolation zone some value representing NODATA must be returned. IsVoidZ can be used to evaluate if the result is NODATA.

See Also

ISurface Interface