Acell shows alignment of chromosomes along the equatorial plate. what will happen next?

If it shows alignment of chromosomes along the equatorial plate, this means that it's in metaphase. The next phase is anaphase which is basically the separating of sister chromatids. Hope it helps!

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