Abstract: Aiming at the geometric misalignment and image mosaic problems in the production of digital orthophoto (DOM), combined with the occlusion detection method and the image registration method based on the TPS thin-plate spline model, the geometric misalignment of the image is repaired and seamlessly spliced. The repair of the geometrically misaligned area is divided into the inner side and the outer side according to the acquired three-dimensional characteristic line. The inner side is repaired by orthorectification. The outer side is selected as an unobstructed image for image registration and then filled. The algorithm is verified by the real over-the-horizon geometric misalignment image. The results show that the method used in this paper can effectively avoid the “bilateral” phenomenon caused by the occlusion image while repairing the geometrical misalignment of the viaduct area, and guarantee the local orthomorphic after the repair. Seamless stitching of images and original orthophotos.

Key words: DOM, geometric misalignment, orthorectification, thin plate spline, stitch