High-accuracy of orthorectification model with self-geometric constraint for high buildings in urban area

This paper first presents how to exam which type of errors causes this incomplete orthorectification in urban highbuilding area, and then presents a new method for orthorectification of high buildings in urban area. The proposed method in this paper is different from the traditional methods, which improved the accuracy by increasing the number and/or improved the geometric distribution of ground control points. This proposed method first established mathematical model of constrain condition on the building edges, such as perpendicularity, and then the established constrain conditions are merged into the orthorectification model. A test field has been used to evaluate our methods. The experiments of comparing the accuracy achieved by our method and other methods are conducted. The experimental results demonstrated that the proposed method can improve the accuracy of 2-5 feet for those buildings of over 100 m high.