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The altitudeInterpretation attribute might be also useful, as it allows to indicate that the upper or lower limit of the airspace layer is excluded in a certain class. For example, certain AIS publications indicate explicitly that the airspace is "class D up to and including FL 065". The current list of values allows only exclusions ('ABOVE_LOWER', 'BELOW_UPPER') to be coded explicitly.
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In the current AIXM 5.1(.1) version, some values do not match their description. For example, "ABOVE_LOWER" is actually defined as "at or above the lower altitude". In order to avoid confusions, it is possible to code explicitly an additional "AT" value if necessary to indicate that a certain airspace class is applicable at the upper or lower limit. |
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A Change Proposal approved by the AIXM CCB for the next version will clarify the coded values of the altitudeInterpretation. See [AIXM-480] Clarify the meaning of SegmentLeg vertical limits and the values of the CodeAltitudeUseTypeThe issue AIXM- 231 has been raised in the AIXM CCB in order to review the list of values for the altitude interpretation. |
Coding Examples
The figure below shows a simple coding example of the class of the AMSWELL FIR including different airspace layers.
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