Digital SNOWTAM Trial: AIXM Database Design Pulsar Consulting sa Avenue Pasteur, 17 1300 Wavre Belgium Tel : +32 10 43 51 00 Fax : +32 10 43 51 01 Web: www.pulsar.be

Agenda General Guidelines Temporality Model Implementation Common Properties and Geoms Notes Implementation ICAO SNOWTAMs Implementation (not included in AIXM) Null Properties Implementation (xNOTAM-Trial)

Implemented only a subset of AIXM 5.x Manual design (no generation) General Guidelines Implemented only a subset of AIXM 5.x Manual design (no generation) As close as possible to the AIXM Conceptual Model One table per class for <<feature>> and <<object>> Inheritance generally not applied at the database level Inherited fields repeated in each table avoid too many joins Notes and many to many relationships Enumerations  database constraint (!! AIXM 5.1 !!)

Temporality Model Implementation Timeslice types: BASELINE PERMDELTA TEMPDELTA STATE (~ long SNAPSHOT) (interpretation) Fields about temporality are repeated in all timeslice tables to avoid having to many joins (validTime, interpretation, sequenceNumber, etc…) Valid Time / Feature Lifetime Sequence Number / Correction Number as explained in the temporality model (in xSNOWTAM, only one TempDelta can be valid at the specific time)

Common Properties and Geoms * Added technical fields in all tables Tracing information Pre-calculated information and aggregated geoms Runway thirds geoms

Notes Implementation One Note table linked to all timeslices tables (many to many) No constraint on property_name (but managed by applications)

ICAO SNOWTAMs Implementation (not included in AIXM) The timeslices impacted by a SNOWTAM are linked to the associated SNOWTAM. Furthermore, the ICAO SNOWTAM is linked to its associated AirportHeliport Feature:

NULL Properties Implementation Timeslices may explicitly set a property to ‘NULL’: means this property has no value anymore (the property is changed to ‘NULL’). In Digital NOTAM Trial: new “is null” boolean property for each nullable simple or complex property = concatenation of the property name and the suffix “_N” (was generated from the db schema) Not needed in Digital SNOWTAM. Contaminations last no more than 24 hours and a “green” SNOWTAM is emitted for ‘all clear’ situation

QUESTIONS