Relation with the baseline data
A Digital NOTAM is a small data set, which provides in a coded format (AIXM 5.1 or later versions) information about operationally significant aeronautical information changes. Most of the time, these changes are of short duration and affect only a few of the properties of a feature (the operational status of a runway, the activation status of an airspace, the position of a runway threshold, etc.). It may also happen that the change is of longer duration or even permanent and it is also possible that the event in fact consists in the creation of a complete new feature (such as a temporary new obstacle).
In most situations, the Digital NOTAM is in the form of a "temporary delta" which contains only the properties actually changed during the event. For example, if an Airspace is activated, the Digital NOTAM is encoded as a TEMPDELTA TimeSlice for the Airspace that contains an (activation.AirspaceActivation.)status='ACTIVE'. The TEMPDELTA and the BASELINE records are closely related, they are facets of the same feature. ToDo add a diagram that shows the Airspace BASELINE and the Airspace TEMPDELTA with their association as a line. We do not need to speak here yet about gml:identifer. | When there is no baseline feature, the Digital NOTAM itself is in the form of a new baseline. It contains all the properties that are necessary to be know for that feature during its duration of validity. ToDo add a diagram that shows the obstacle as a new BASELINE |
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