>>> from karrie.django.ogna.models import Project
>>> mz = Project.objects.get(name="Mainz")
>>> a_dist = Project.objects.distance(mz.center)
{'select_field': <django.contrib.gis.db.models.sql.conversion.DistanceField object at 0x34456d0>, 'procedure_fmt': '%(geo_col)s,%%s', 'setup': False, 'select_params': [<django.contrib.gis.db.backends.postgis.adapter.PostGISAdapter object at 0x3445750>], 'geo_field': <django.contrib.gis.db.models.fields.PointField: center>, 'procedure_args': {'function': 'ST_distance_sphere', 'geo_col': '"ogna_project"."center"', 'geom': <Point object at 0x311beb0>}, 'geom_args': ('geom',), 'geom_field': None, 'desc': None}
model_att: ST_distance_sphere("ogna_project"."center",%s)
select_params: [<django.contrib.gis.db.backends.postgis.adapter.PostGISAdapter object at 0x3445750>]
>>> a_dist[0].distance
Distance(m=84958.0635775)
>>> a_azimuth = Project.objects.azimuth(mz.center)
{'select_field': <django.contrib.gis.db.models.sql.conversion.GeomField object at 0x3445710>, 'procedure_fmt': '%(geo_col)s,%%s', 'select_params': [<django.contrib.gis.db.backends.postgis.adapter.PostGISAdapter object at 0x3465a10>], 'procedure_args': {'function': 'ST_Azimuth', 'geo_col': '"ogna_project"."center"', 'geom': <Point object at 0x311beb0>}, 'geom_args': ('geom',), 'desc': None, 'geom_field': None}
model_att: ST_Azimuth("ogna_project"."center",%s)
select_params: [<django.contrib.gis.db.backends.postgis.adapter.PostGISAdapter object at 0x3465a10>]
>>> a_azimuth[0].azimuth
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 189, in __getitem__
    return list(qs)[0]
IndexError: list index out of range
>>>