In areas with structurally complex geology, tomographic velocity analysis is required to estimate velocities. This paper describes a tomographic velocity analysis algorithm which uses planewave synthesis imaging as a prestack migration. In reflection tomography, prestack migration is required for finding reflector locations and measuring traveltime errors. The method described in this paper performs the reflector picking in the stacked images obtained by surface-oriented planewave synthesis imaging and measuring traveltime errors in the form of residual moveout (RMO) velocity in common surface location (CSL) gathers obtained by reflector-oriented planewave synthesis imaging.