EUROCONTROL is an intergovernmental organisation with 41 Member and 2 Comprehensive Agreement States.
The Digital NOTAM Subscription and Request Service allows the service consumer to get aeronuatical information in accordance with the Digital NOTAM specification. The aeronautical information conforms to the event scenarios that are supported by Digital NOTAM such as runway closures. The service consumer may subscribe to the service, specifying the event scenarios of interest. It is also possible to send a direct request to the service to get the aeronautical information. The information returned is in the form of an AIXM 5.1.1 message. This supports the integration of the latest information into an existing aeronautical information store in the various ATM systems.
The service offers subscription and request capabilities to distribute aeronautical data based on event scenarios.
The service consumer shall be able to request the redistribution of a Digital NOTAM (if, for example, the original distribution was not received).
Access and Use
The service shall ensure point-to-point integrity in accordance with EUROCONTROL Specification for SWIM Technical Infrastructure (TI) Yellow Profile through the use of Transport Layer Security (TLS) 1.2 or above.
Quality of Service
The service shall ensure integrity by using SWIM Technical Infrastructure (TI) Yellow Profile bindings.
Quality Of Data
The aeronautical data offered by the service shall satisfy the applicable sections of Commission Implementing Regulation (EU) 2017/373 of 1 March 2017.
The aeronautical data offered by the service shall be encoded according to the event scenarios given in the Digital NOTAM Specification.
The aeronautical data offered by the service shall apply the AIXM 5.1.1 coding guidelines. This includes:
- Common Coding Guidelines
- Technical Coding Guidelines
Web Feature Service - Temporality Extension
The event scenarios use features that are in the Aeronautical Information Exchange Model (AIXM) 5.1.1 and the AIXM Event Extension.
The AIXMBasicMessage that is returned by the service shall contain an event feature and the related AIXM features and time slices.
The Digital NOTAM Subscription and Request Service Request Interface shall support filtering based on the operators defined in the OGC Filter Encoding 2.0 Encoding Standard. The temporal extension (WFS-TE) shall be used to support advanced temporal filtering. As a minimum use case number 4 (Retrieve the BASELINE of a feature valid at a point in time) shall be supported. The other uses cases should be supported.
The Digital NOTAM Subscription and Request Service Subscription Interface shall allow for the selection of event scenarios of interest. These should be organised around e.g. a specific aerodrome or airspace. The considerations given in the General Principles for the Digital NOTAM will help AISP organise the event scenarios.
Source of Information
- Owners of Obstacles.
A service monitoring mechanism shall be made available to service consumers.
The service behaviour shall be in accordance with the patterns detailed in Message Exchange Patterns: Identification Guidelines.
The two interfaces have different behaviour. A combination of an AMQP 1.0 implementation and an OGC Web Feature Service 2.0 Interface Standard implemetation shall be used for the basic behaviour.
The typical behaviour for PUBLISH_SUBSCRIBE means that:
- A request-reply implementation handles the subscription. See the Digital NOTAM Subscription and Request Service Subscription Interface.
- An AMQP 1.0 implementation handles the distribution of the messages. See the Digital NOTAM Subscription and Request Service Distribution Interface.
For SYNCHRONOUS_REQUEST_REPLY (used in the Digital NOTAM Subscription and Request Service Request Interface), the typical behaviour is as follows:
- The request message is sent from the service consumer to the service
- The service consumer remains blocked while awaiting the reply
- The service remains blocked while processing the reply
- The AIXM Basic Message, the reply message, is sent from the service to the service consumer.
Allows the service consumer to request an AIXM Basic Message based on filters which are linked to the event feature.
Service Interface Binding
EUROCONTROL Specification for SWIM Technical Infrastructure (TI) Yellow Profile
Network Interface Binding
The OGC Web Feature Service 2.0 Interface Standard shall be used.
The standardised operations for a Basic WFS shall be implemented.
The information scope offered by the service supports the requirements of the Digital NOTAM Specification.