$partialdiff sub Y$ max [ Y , max ( WORLDBATH bath ) ]
| Longitude | grid: /X (degree_east) periodic (0.04166667E) to (0.04165649W) by 0.08333334 N= 4320 pts :grid |
|---|---|
| Latitude | grid: /Y (degree_north) ordered (89.91667N) to (89.91667S) by 0.08333334 N= 2159 pts :grid |