Excessive thirst, dry tongue and mouth, weight loss, fatigue, weakness, incoordination, mental dullness, low urine volume, slightly elevated body temperature, high serum protein and sodium describes

It is definitely dehydration.

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