Tall grasses, acacia trees belong to what biome

Carbon-14 has a half-life of 5,730 years and most igneous rock is older than that.

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