def filter_regions(self):
        return self.filter_nodes('/DistrictBuilder/Regions/Region')
Floating Algae Index. Method from paper: Feng, Hu, Chen, Cai, Tian, Gan,
dataset/ETHPy150Open PublicMapping/DistrictBuilder/django/publicmapping/redistricting/__init__.py/StoredConfig.filter_regions--crossover with--dataset/ETHPy150Open nasa/CrisisMappingToolkit/cmt/modis/simple_modis_algorithms.py/fai