A method is provided for generating height information for an image point on a rectified image from first and second aerial images having respective first and second sets of rational polynomial coefficients (RPCs), the first and second aerial images and the rectified image including overlapping image locations. The method comprises steps for generating epipolar lines and RPC lines and intersection points of epipolar lines and RPC lines. The method also comprises steps for equating line and sample coordinates to cubic polynomial equations and simultaneously solving the cubic polynomial equations to generate a height of the image point.