What happens to sister chromatids in meosis 2?

They are pulled apart and put onto each side of the cell so the cell can pinch in the middle and let cell division happen

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