def slim_aggregates(aggregates):
    """"slim version of the region aggregates, minimizing NoData and verbose naming"""
    slimmed_aggregates = []
    for aggregate in aggregates:
        verbose_keys = list(aggregate.keys())
        for verbose_key in verbose_keys:
            slim_key = verbose_key.split('_')[0]
            aggregate[slim_key] = aggregate.pop(verbose_key)
        datetime = aggregate['datetime']
        aggregate['Date'] = datetime.split('T')[0] + 'Z'
        aggregate.pop('datetime', None)
        slimmed_aggregates.append(aggregate)
    return slimmed_aggregates
