GEOMETRIC CORRECTION OF REMOTELY-SENSED IMAGERY USING GROUND CONTROL POINTS AND ORTHOGONAL POLYNOMIALS

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 required whenever the image is to be compared with existing maps or with other images. The authors deal 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.