The schools are in same quintile, albeit Maryland on the high end and UCONN on the lower end. In any event, both schools lag Southern schools by quite a bit, which isn't surprising. I grew up and lived in the Northeast but now live in the South. Sports here are a year-round endeavor—even hockey. There's also significantly more year-round local media that provides a platform for Southern players that Northern players don't benefit from.
The map posted was built around blue chip recruits. But, when you look at who actually gets drafted it's a somewhat different story. Coaching and player development may come into play. The fact that UCONN drafted more players this year than all Big Ten schools (without any coming in ranked higher than 3 stars) is a big deal. It may also suggest that high school recruiting is not an exact science—more than 30 "unranked" players were drafted this year. Heres's a quick synopsis for 2013 which shows that California was the home state to nearly three times more draftees than Louisiana which was at or near the top of blue chip recruit map.
http://gamedayr.com/gamedayr/2013-n...g-rankings-home-state-conference-affiliation/
USA today did a pretty good job compiling data on NFL draft picks (it doesn't include 2013). It allows you to select different ranges, etc. to spit out custom data. Browsing by "High School' provides data that relates to home states. When you look at the data you'll see that the South, at least when it comes to NFL draft picks (aside from Texas and Florida), is not so far ahead of some northern states.
http://usatoday30.usatoday.com/sports/football/nfl/draft-history-graphic.htm?loc=interstitialskip