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5 changes: 3 additions & 2 deletions doc/source/development/extending.rst
Original file line number Diff line number Diff line change
Expand Up @@ -33,8 +33,9 @@ decorate a class, providing the name of attribute to add. The class's

@staticmethod
def _validate(obj):
if 'lat' not in obj.columns or 'lon' not in obj.columns:
raise AttributeError("Must have 'lat' and 'lon'.")
# verify there is a column latitude and a column longitude
if 'latitude' not in obj.columns or 'longitude' not in obj.columns:
raise AttributeError("Must have 'latitude' and 'longitude'.")

@property
def center(self):
Expand Down