I Think you are getting down-voted by misunderstanding what the parent was saying. The parent is talking about mapping out WiFi and Cell data through a city. M

I Think you are getting down-voted by misunderstanding what the parent was saying. The parent is talking about mapping out WiFi and Cell data through a city. Mapping out it's radio spectrum spatially. Not a traditional human usable map such as a street map, road conditions, or whatever else you may be thinking.