1. A system comprising: a catheter including: a flexible catheter body having a distal portion; and at least one electrode disposed on the distal portion, the at least one electrode configured to measure an electrical signal based on a cardiac activation signal; and a mapping processor configured to: acquire the electrical signal from the at least one electrode; provide an electrogram based on the electrical signal; determine a sharpness feature associated with the electrogram and, based on the determined sharpness feature, determine a characteristic of a morphology of the electrogram, wherein the characteristic of the morphology of the electrogram is related to the sharpness.