The computation of anisotropic ADCIGs is based on the generalization of integral migration
to the computation of a prestack image that includes the subsurface offset dimension () in
addition to the usual image depth () and midpoint (). Figure 1 illustrates the surface
offset dimension: the image point belongs to the migration response of an
impulse recorded at midpoint m_{D}, surface offset h_{D} and traveltime t_{D} - provided that the
traveltime along the source and receiver paths (of length L_{s} and L_{r}, respectively) is equal to
t_{D}.

imp-resp
Figure 1
Illustration of generalized migration, where the prestack image is function of the
subsurface offset. and are the group aperture and
dip angles, respectively.