Why did leeuwenhoek have an advantage over other scientists studying small items?

Leeuwenhoek had an advantage studying small items because he created lens with a high amplifying power and from there created microscopes with those lens. He used this technology to investigate microorganisms and came to discoveries such as of the existence of bacteria, the existence of the vacuole and the banded pattern of the muscular fibers.

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