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v4.5
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    v4.5

      distance()

      La fonction distance() retourne la distance directe entre deux coordonnées géographiques en mètres.

      Arguments:

      • Coordonnées géographiques1 <point>
      • Coordonnées géographiques2 <point>

      Retourne:

      • Distance <number>

      Echantillon de graph : (à utiliser pour les exemples suivants)

      Exécutez les UQLs ci-dessous un par un dans un graphset vide pour créer des données de graph:
      create().node_property(@default, "name").node_property(@default, "lat_long", point)
      insert().into(@default).nodes([{_id:"L001", _uuid:1, name:"New York", lat_long:point({latitude:40.7, longitude:-74.0})}, {_id:"L002", _uuid:2, name:"Paris", lat_long:point({latitude:48.5, longitude:2.2})}, {_id:"L003", _uuid:3, name:"Sydney", lat_long:point({latitude:-33.9, longitude:150.9})}, {_id:"L004", _uuid:4, name:"Beijing", lat_long:point({latitude:39.9, longitude:116.3})}])
      

      Utilisation Courante

      Exemple : Calcul direct, retour en kilomètres

      find().nodes({name in ["New York", "Paris"]}) as a
      find().nodes({name in ["Sydney", "Beijing"]}) as b
      return table(a.name, b.name, distance(a.lat_long, b.lat_long)/1000)
      

      |  a.name  | b.name  | distance(a.point, b.point)/1000 |
      |----------|---------|---------------------------------|
      | New York | Sydney  | 16017.5939640978                |
      | Paris    | Beijing | 8247.41966611293                |
      

      Exemple : Multiplier et calculer, retour en kilomètres

      find().nodes({name in ["New York", "Paris"]}) as a
      find().nodes({name in ["Sydney", "Beijing"]}) as b
      with distance(a.lat_long, b.lat_long)/1000 as c
      return table(a.name, b.name, c)
      

      |  a.name  | b.name  |         c        |
      |----------|---------|------------------|
      | New York | Sydney  | 16017.5939640978 |
      | New York | Beijing | 10992.9752060986 |
      | Paris    | Sydney  | 16967.299225946  |
      | Paris    | Beijing | 8247.41966611293 |
      
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