Building contour precise extraction method based on point cloud and UAV image secondary registration

The invention discloses a building contour precise extraction method based on point cloud and UAV image secondary registration. The method provides powerful technical support for projects of special subject of "illegal building demolition and chaos regulation" of ministry of housing and urban-rural construction. The method is characterized by, under the premise of non-contact measurement, carryingout data acquisition on a target region through an UAV (unmanned aerial vehicle) and a laser scanner to obtain precise contour and dimension information of a complex building from the earth's surfaceto the top of the building; and comparing the original design contour and a current state tif file to judge whether the building has redundant contour, the redundant contour being illegal buildings.With advantages of two kinds of data of the terrestrial three-dimensional laser scanner and the aerial UAV being combined, the method provides complete and high-precision building top and facade total-factor information based o