IARGlobe.Elevation Property

The distance between observer location and globe’s surface.

[Visual Basic 6.0]
Property Elevation As Double

[Visual Basic .NET]
Public Property Elevation As Double

[C#]
public double Elevation {get; set;}

Available with ArcGIS Desktop. Requires Publisher Extension.

The altitude, relative to sea level, of the current observer location.

Elevation is measured in Kilometers.

EDN: ESRI Developer Network