| GUAN | GCOS Upper-Air Network (GUAN) |
| Hex272 | Global Hexagonal Grids |
| Hex92 | Global Hexagonal Grids |
| sphere_grid | Latitude-Longitude Grids |
| sphere_khat | Calculate Spherical K-Function |
| sphere_montekhat | K-functions Under Complete Spatial Randomness (CSR) By Monte Carlo Tests |
| sphere_random | Generate Random Points On Sphere |