Certainty CheckAltitude(
	int aircraftId,
	DateTime messageReceived,
	int altitude
)

Function CheckAltitude ( 
	aircraftId As Integer,
	messageReceived As DateTime,
	altitude As Integer
) As Certainty

Certainty CheckAltitude(
	int aircraftId, 
	DateTime messageReceived, 
	int altitude
)

abstract CheckAltitude : 
        aircraftId : int * 
        messageReceived : DateTime * 
        altitude : int -> Certainty 

Parameters

aircraftId

Type: SystemInt32
The unique identifier of the aircraft.

messageReceived

Type: SystemDateTime
The UTC date and time that the message was received.

altitude

Type: SystemInt32
The altitude in feet.

Return Value

The code needs to build up some history before it can determine whether the aircraft could attain the altitude specified without breaking the laws of physics. The first call for an aircraft will always return Uncertain. If the second altitude is compatible with the first then it will return ProbablyRight, otherwise if at least one of them is wrong then more messages may need to be received until the code can start returning Certainty values of ProbablyRight. Whenever this returns CertainlyWrong you should discard the altitude.

Once this method returns CertainlyWrong it will reset and will not return ProbablyRight until a pair of altitudes have been received that seem to be sane.

Reference