Unmanned aerial vehicle shooting and reconstruction method and device for building facade fine modeling

The invention discloses an unmanned aerial vehicle shooting and reconstruction method and device for building facade fine modeling, and the method comprises the steps: S1, using a camera carried by an unmanned aerial vehicle to vertically downwards shoot a building image from the air, obtaining the plane and elevation information of a building after photogrammetry processing, selecting the outer contour range of the building, constructing a rough three-dimensional frame model of the building in combination with the elevation information; S2, extracting a planar graph of the building according to the rough model of the building, establishing an external expansion boundary of the planar graph of the building to obtain an outer contour line of the building, generating a transverse or longitudinal unmanned aerial vehicle flight path of a building facade according to the outer contour line of the building, and obtaining a facade shot image collected by flight according to the unmanned aerial vehicle flight path; a