Guide to Magellan Image Interpretation

Figure 4-1. Solving for heights using same-side stereo images.

Figure 4-1. Solving for heights using same-side stereo images. Measurements are taken from the separate images of a same-side stereo image pair to determine the height of point P above the reference plane, R. As wavefront W1 intercepts point P, the projection in range space (i.e., time delay) places the echo from P at point p1 on plane R. Similarly in the second image, the echo from point P is placed at point p2 Identify a point r1,2 in a low-relief area on the plane R, and measure the distance from r1,2 to p1 on image 1, and from r1,2 to p2 on image 2. The difference between these distances (d1 - d2) is s, the parallax of point P. Using the incidence angles of the two observations (Greek letter theta subscript 1 and Greek letter theta subscript 2 ), the height h of the feature is obtained by dividing s by the parallax-to-height ratio (cot Greek letter theta subscript 2 - cot Greek letter theta subscript 1 ).

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