Depending on the seismic experiment we are analyzing, the coordinates of the image space possess different information relevant to the experiment. We refer to a conventional seismic reflection experiment, where the source and the receiver have the same type of wave, as single-mode. For this case, the transformation from the subsurface-offset domain into the angle-domain is a well-known process in the literature Sava and Fomel (2003). In this case the angle axis represents the true reflection opening angle. Chapter 3 discusses the common-image gathers for PS seismic data, focusing mainly on the accurate transformation from the subsurface-offset domain into the angle-domain to obtain true PS-ADCIGs.
Using both synthetic and real datasets, I show that true PS-ADCIGs correctly describe the image, where the polarity flip occurs at zero angle and it is an indicator for the accuracy of the final PS image. Furthermore, the true PS-ADCIGs could be used to update both the P and the S velocity models using, for example, velocity analysis by profile migration Al-Yahya (1987)