Farmland water level observation device and method based on scanning measurement of unmanned aerial vehicle

The invention discloses a farmland water level observation device and observation method based on unmanned aerial vehicle scanning measurement. The device comprises a water level observation ruler, an unmanned aerial vehicle, an image acquisition assembly and a control assembly. The method comprises the steps of obtaining a plurality of sample pictures; obtaining a target identification model for identifying the water level observation ruler; controlling the unmanned aerial vehicle to obtain a real-time picture; the real-time picture is input into a target recognition model, and the target recognition model judges whether a water level observation ruler exists in the real-time picture or not; a telephoto picture of the water level observation ruler is obtained through a telephoto lens of the image acquisition assembly, basic information is obtained by recognizing the two-dimensional code, and water level data is obtained through a water level gauge; the unmanned aerial vehicle is matched with the image acquis