Drones are a great platform for visual auditing tasks!
We can fly over a structure, a piece of land or a body of water; we can follow a boundary or other feature to trace its outline, taking photographs or video as we fly to document the extents of a flood or weather damage to crops etc.
We can collect images to document the condition of rooftops, chimneys, roads, towers etc. and then produce reports that identify the location of assets and the photographs that we took of them.
Often we can produce a 3D model of the asset or area of interest for easier navigation and arrange the images in 3D space around it for a more intuitive inspection/navigation experience.