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For Route Segment, PANS-AIM requires some basic properties as part of the minimum AIP data set. This is
...,from point, to point, track, distance, upper limit, lower limit, MEA, MOCA, ...
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In some State AIPs, an additional limit, "overriding" the Lower limit specification is published. To publish this minimum limit, often statements such as " but at least" are used. The Lower limit override always refers to ground e.g. "feet above ground". How to encode this in AIXM 5.1.1? in AIXM 4.5, a dedicated attribute was provided VAL_DIST_VER_LOWER_OVRDE Example:
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Regarding the general encoding guidelines and rules for vertical limits see topic Vertical Limits.
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