What is evidence that each color of visible light has a wave of a specific wavelength. pls help me :)

From a high concentration to a low concentration.

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