db = db.getSiblingDB("sensor_data")
db.createCollection('noise_sensors',{timeseries: {timeField: 'datetime', metaField: 'sensorid'}})
db.noise_sensors.createIndex({datetime: 1})
db.noise_sensors.createIndex({sensorid: 1})
db.noise_sensors.createIndex({datetime: 1, sensorid: 1})
db.createCollection('properties')
db.properties.createIndex({"location.id": 1})
db.properties.createIndex({"location.loc.coordinates": "2dsphere"})