Flying our drone makes a massive difference for what we can see during our inspections and the detail we can give in our roof defect reports. Certainly a different perspective than the traditional "binoculars from ground level" only view point, which is often the most offered by many other Surveyors.
We normally use a combination of drone flights; remote operated 10 meter camera poles; powerful optical zoom cameras; and the 'good-old' "binoculars from the ground" approach.