Test of sm.px()

[jingsam]

I have made a plot with the results of sm.px(). see bellow:

1. zoom=0, latitude=0, longitude=[-360, 360]
   

Problem: when the longitude is less that -180, the px will decreased continuely. Howerver when the longitude is greater than 180, the px is fixed to 256, which I think should be greater than 256.

1. zoom=0, longitude=0, laitude=[-360, 360]
   

Problem: When the latitude is in the range of [85, 95], the px should be fixed to zero.

[jingsam]

Another test of sm.ll()

1. zoom=0, y=0, x=[-512, 512]
   
2. zoom=0, x=0, y=[-512, 512]
   

As we can see, sm.ll() is not strictly inverse of sm.px()