Example computer-implemented method, computer-readable media, and computer system are described for generating subterranean imaging data based on vertical seismic profile (VSP) data. In some aspects, VSP data of a subterranean region can be received. Four angle attributes for each image point can be computed based on the received VSP data. Five-dimensional (5D) angle-domain common-image gathers (ADCIG) can be generated according to a ray-equation method based on the four angle attributes.