the max tile value is actually 20x20 (i.e http://himawari8.nict.go.jp/img/D531106/20d/550/2015/07/10/205000_19_10.png http://himawari8.nict.go.jp/img/D531106/20

the max tile value is actually 20x20 (i.e http://himawari8.nict.go.jp/img/D531106/20d/550/2015/07/10/205000_19_10.png http://himawari8.nict.go.jp/img/D531106/20d/550/2015/07/10/2...) making it the 11000x11000 res.