def write_to_db(self, db):
"""Write all the cloud information to the survey database.
Parameters
----------
db : :class:`.SocsDatabase`
The instance of the survey database.
"""
indicies = numpy.arange(1, self.cloud_dates.size + 1)
cloud_info = list(map(tuple, numpy.hstack((indicies, self.cloud_dates,
self.cloud_values)).reshape(-1, 3, order='F').tolist()))
cloud = [write_cloud(ci, db.session_id) for ci in cloud_info]
db.write_table("cloud", cloud)
