What are the possible causes of the presence of glucose in the urine? ?

May mean that the woman has gestional diabetes

What's the yellow wallpaper?

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