What is the name of the atmosphere we live in, which is about 5-9 miles thick, depending on where you are on Earth.

A.) The Stratosphere

B.) The Exosphere

C.) The Mesosphere

D.) The troposphere

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