ni = 690
nj = 710
i,j pt: (  1,  1) lon,lat: 139.80557 E  36.89956 S
i,j pt: (  1,710) lon,lat: 120.68232 W  37.72696 S
i,j pt: (690,710) lon,lat:  31.89757 W  31.71799 S
i,j pt: (690,  1) lon,lat:  52.78271 E  31.02595 S
south pole is 300.000000 360.000000