Future of Construction Sector: Drone

Drones are just taking off. drones have gone from experimental to essential for tasks such as monitoring site progress, generating accurate contour maps, and measuring stockpiles. In fact, our customers tell us drones have saved them thousands of dollars by unlocking big savings on surveys, catching grading errors before machinery has left the site, and even salvaged subcontractor relations.

[banedanes]

Hi!
What are the main features to look after when buying a drone?
How long should baterry last to complete surveying? (Of course the size of an object being scanned decides this, but talking in general)