Geometric correction of remotely-sensed imagery usiing ground control points and orthogonal polynomials

Abstract

Remotely-sensed data obtained from satellites or aircraft are usually geometrically distorted due to the acquisition system and the movements of the platform. A geometric correction of the image is required whenever the image is to be compared with existing maps or with other images. This paper deals with the composition of a correction function using ground control points. Use is made of orthogonal functions. They offer a computational advantage and simplify the analysis of significant terms in the correction function. An accuracy analysis is performed, with emphasis being laid on the number and location of the ground control points.