Google Street View provides comprehensive data on many European Union member countries.  However, Germany and Austria are not well mapped.  Due to privacy concerns, much of Germany opted-out or restricted Google from proceeding with its mapping project.

Sometimes we believe we have a complete data set only to learn that we do not see the whole picture.  If we do not take into account the human element, we may find by the numbers decision-making leads to unanticipated failure.