Saltatory propagation occurs in axons, in which action potentials .

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it

Ilike to eat pears ya nah wha im sayin b? shout out to all my pears b.