How many chromosomes are present at the end of metaphase?

24 and in metaphase the hair like things in the cell pull the chromosomes apart for where later the cell can split and make 2 cells 

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