original reduced grid (N80) | octahedral reduced grid (O80) | regular grid (F80) | ||
|---|---|---|---|---|
| Total number of grid points | 35718 | 28480 | 51200 | |
| Resolution at equator (lat-lon) | 1.125° | 1.125° | 1.125° | |
| Resolution at equator (km) | 125 | 125 | 125 | |
| Average resolution (km) | 120 | 134 | 100 | |
- 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 \( \sqrt{4 \pi R^{2}_{\mbox{earth}}/N_{p}} \)
km, where \( N_{p} \) is the total number of grid points.