var stations_geojson={
  "Istres":{"lat":43.522667,"lon":4.927500,NUM_POSTE:"13047001"},
  "Nice (Côte d'Azur)":{"lat":43.648833,"lon":7.209000,NUM_POSTE:"06088001"},
  "Orly (Paris-Orly)":{"lat":48.718000,"lon":2.397000,NUM_POSTE:"91027002"},
  "Roissy (Paris-Charles de Gaulle)":{"lat":49.015167,"lon":2.534333,NUM_POSTE:"95527001"}
};