The code attempts to compute the slope of a given landing region in a satellite image from stereo images by following the papers and algorithms by pages.cpsc.ucalgary.ca/~samavati/papers/others/tele-Art/szeliski96.pdf, http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.33.2815 and homography based image matching.