Getting a RIZE out of this video...
Asian countries have employed model aircraft for spraying pesticides for more than a decade. This is old technology by today's standards where the pilot has to operate the controls directly. The newer machines have GPS and the operator can program the path the helicopter (or drone) will follow as well as the altitude. It becomes 'hands off' and fully automated.Either way... you might get a Rize out of this video too!
While the pilot/operator had a safety helmet on, he was lacking in no filter mask... something I think is essential when spraying any (fertilizer, pesticide) chemicals over a large area.