Orthorectification Using Rational Polynomials

You can orthorectify certain types of satellite images that are supplied with a mathematical model of the image geometry in the form of a set of rational polynomial coefficients. This procedure also requires a digital elevation model. You can often improve the fit of the rational polynomial model to a particular image by regeoreferencing the image using accurate 3D ground control points.
 

Orthorectification Using Rational Polynomials   (file date: 27 Sep 11)

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