Which is true of oxidation?
a) It is a physical process
b) No change occurs in the makeup of rock
c) Rocks weather at different rates
d) Water freezes in cracks in rock

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

The form that the information for a map is store is by satellite image