original reduced grid (N48) | octahedral reduced grid (O48) | regular grid (F48) | ||
|---|---|---|---|---|
| Total number of grid points | 13280 | 10944 | 18432 | |
| Resolution at equator (lat-lon) | 1.875° | 1.875° | 1.875° | |
| Resolution at equator (km) | 210 | 210 | 210 | |
| Average resolution (km) | 196 | 216 | 166 | |
- The lat-lon resolution at the equator is given by 90o/N where N is the number of Gaussian latitudes between the pole and equator.
The resolution in kilometres at the equator is given by ~10000/N km (assuming a circumference of the earth of ~40000 km).
The average resolution is given by √(4 π R2 / Np) km, where R is the radius of the earth and Np the total number of grid points.