This computational procedure is called photogrammetric intersection.
Suppose that a stereo line pair consists of an image
line of Array I (fore-looking) at time t and an image line
of Array I1 (nadir looking) at time t+At (Figure 4). Image coordinates,
x, and x,,, of a ground point P in both image lines
are measured. The ground coordinates of P, or vector r, are
to be computed