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Set the observer location as a combination of latitude and longitude in decimal degrees plus altitude in kilometers.
[Visual Basic .NET]
Public Sub GetObserverLatLonAlt ( _
    ByRef pLatDD As Double, _
    ByRef pLonDD As Double, _
    ByRef pAltKMs As Double _
)
[C#]
public void GetObserverLatLonAlt (
    ref double pLatDD,
    ref double pLonDD,
    ref double pAltKMs
);
[C++]
HRESULT GetObserverLatLonAlt(
  System.Double* pLatDD,
  System.Double* pLonDD,
  System.Double* pAltKMs
);
[C++] Parameters pLatDD [out]
pLatDD is a parameter of type double* pLonDD [out]
pLonDD is a parameter of type double* pAltKMs [out]
pAltKMs is a parameter of type double*