This is an interesting interview that explains why mapping is important and how it should be done to ensure the final product is useful for policy. Unfortunately, much of the broadband mapping in the U.S. has been done by a telco-front group called Connected Nation that produces shoddy, unverifiable maps without making any useful data public.
In this report, Gordon Cook interviews Sara Wedeman, a mapping expert who also works in behavioral economics. Cook describes the interview here, on his blog. The discussion ventures beyond mapping, offering keen insights into why universal broadband availability is so important.