To apply RIP to 3-D data, we chose to change our migration operator
from downward-continuation migration to
common azimuth migration Biondi and Palacharla (1996). This helps to keep our computational needs
relatively low for a 3-D imaging problem. It also means that we will only be
handling the inline offsets,
so geophysical RIP will only be acting along the inline offset ray
parameter.