The research of geometric correction in treat the geometry to Unmanned small aircraft at low altitude image

Geometric distortion is important in the research of image geometric processing. This paper introduces a unique technique for image processing based on low-altitude UAV (Unmanned Aerial Vehicle) and accordingly generating the DEM and Digital Orthophoto. Through the UAV image Orthorectification and the regional network of radio beam method for adjustment of the whole deal, and then analyzes the impact of accuracy of geometric correction factors. Experiments proved the scheme is reliable which arrange ground control points more dense around the peripheral field.