A Local Transformation Method for Generating an Orthoimage

This paper presents a new Local Transformation method for the generation of an orthoimage, focusing on the use of automated procedures and accuracy improvement. Edges are extracted and used for tie point positioning, with block processing and a point template utilized to clarify the selected tie points. Although the Local Transformation uses the same polynomial function as the Global Transformation introduced by the author [see MSRS, Vol. 40, No. 2, pp. 212-224], the accuracy of the final output increases and manual processes are reduced. With an output accuracy of less than 1 pixel of residual, the results are acceptable.