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Relation with the baseline data

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Introduction

A basic knowledge of the AIXM key concepts, in particular of the Temporality model, is necessary in order to understand the Digital NOTAM coding examples discussed here. The XML sources are attached, together with the Visio file that contains the source of the diagrams used on the page.

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).

Relation with the baseline data

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'.

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The TEMPDELTA and the 
BASELINE records are closely related, they are facets of the same 
feature.

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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.
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The role of the Event feature

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take the previous diagram and add the Event as another box, related to the TEMPDELTA. Add a second TEMPDELTA for a related feature (a route closure)



 Warning
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take the previous diagram and add the Event as another box, related to the BASELINE. Add a second TEMPDELTA for a related feature (a runway closure because of a temporary crane at its end.


Basic elements of the XML coding
explain here the basic elements of the XML coding (collapsed elements), for the two threads
  • the Event
  • the TEMPDELTA timeslice with its type and its meaningful attributes.
  • the association with the event
More advanced elements of the XML encoding
For both threads
  • duration of validity
  • gml:identifier as the principal means to connect the TEMPDELTA with the BASELINE. Mention that the BASELINE is not part of the digital NOTAM encoding, but that it can be provided as a complement. More details in the next section.
Option - complementary baseline data
Except for the new obstacle, show here how additional baseline data could be provided in order to:
  • generate NOTAM text or text for pre-flight briefing
  • graphicaly represent the event
  • identify the feature affected in a system that does no use the UUID values as feature identifier

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