Pokemon Go Map in Unity

Hey so I know a bit about unity, I have been teaching myself for about 2 Years so I know all the basics and can code without tutorials but still can not do the really impressive stuff I’d Like.

My Question for today is, Is there any way to create the map pokemon go has, like I dont need the game to be online or anything. I have a game Idea which uses a map design like pokemon Go, with the players being allowed to walk around their neighborhood. I also want to make random things appear on the map like how pokemon appear. I have looked up videos on youtube, but simply they don’t really help with what I am looking for. Is there any documents or help out there to setup a map like I want. Thank you!