https://virginiatech.sportswar.com/tech-tidbits/2018/02/22/ncaa-quadrant-system-explained/
It's the committee's new formula. Kenpom helped develop it.
I'm personally not a fan because Mid-Majors are lucky to get a "Quadrant 1" level opponent 1 or 2 times a season and there is almost not chance they play on your home court. Most of the time the mids will have to go there.
Quadrant 1: Home games vs. RPI top 30, neutral games vs. RPI top 50, road games vs. RPI top 75
Quadrant 2: Home games vs. RPI 31-75, neutral games vs. RPI 51-100, road games vs. RPI 76-135
Quadrant 3: Home games vs. RPI 76-160, neutral games vs. RPI 101-200, road games vs. RPI 136-240
Quadrant 4: Home games vs. RPI 161-351, neutral games vs. RPI 201-351, road games vs. RPI 241-351
(https://i.turner.ncaa.com/sites/default/files/images/2017/12/04/team-sheet-guide-12-4.png)