Improved imagery over the years have powered counting of trees, particularly over vast stretches of land, best done by a computer.
'Flying photographer' George Steinmetz on capturing environmental change, the ethics of using drones
George Steinmetz says he photographs from a couple hundred feet up, which allows him to observe the scale. 'It’s much more intimate and we can decode what’s happening below. Flying helps you to get into areas you otherwise cannot,' he says