The droplet coverage rate and deposition density
were improved by the canopy shape changing from a
natural round shape to the open shape when the UAV
operates at the 1.0 m height. The spray performance is
stable along the flight direction in the operating process
by this UAV. However, the droplet is easily affected by
crosswinds and this could cause the droplet drift,
deposition reduction, poor uniformity and large discrete
degree