Translations:Migration in the case of constant velocity/8/en

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The next step is superposition. We superimpose all the pieces of bread. In other words, all the numerical ellipsoids are added together. (In practice, as soon as an ellipsoid is computed, it would be added cumulatively to the running sum.) Interference tends to destroy the noise, and we are left with the desired 3D image of the earth. This process is an elaborate numerical version of what J. Clarence Karcher did graphically in 1921 (Figure 5). The authority for this procedure is the time-honored Huygens’ construction along with the interference principle of Fresnel.