class Position { Position({ this.altitude, this.id, this.longitude, this.timestmp,}); Position.fromJson(dynamic json) { altitude = json['altitude']; id = json['id']; longitude = json['longitude']; timestmp = json['timestmp']; } double? altitude; int? id; double? longitude; int? timestmp; Map toJson() { final map = {}; map['altitude'] = altitude; map['id'] = id; map['longitude'] = longitude; map['timestmp'] = timestmp; return map; } }