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Kinematics of the angle-domain transformation

In 2-D, ADCIGs are computed by applying a slant-stack decomposition to the prestack image along the subsurface-offset axis at a constant midpoint. The kinematics of the transformation are defined by the following change of variable:
\frac{\partial z_\xi}{\part...
\\ z_{\tilde{\gamma}}
\tan \widehat{\gamma},\end{eqnarray} (9)
where $z_{\tilde{\gamma}}$ is the depth of the image point after the transformation.