Statistics of ZTD differences (GNSS/InSAR interpolated ZTDs from COSMO-1-calculated ZTDs) when considering different InSAR footprint size
| InSAR footprint size (the PSI points sample spacing remains unchanged) | 30 × 22 km2 | 25 × 18 km2 | 20 × 14 km2 | 15 × 10 km2 | 10 × 6 km2 | 6 × 3.5 km2 |
| Std.dev (ZTD differences) [mm] | 2.1 | 2.1 | 2.3 | 2.5 | 2.7 | 2.8 |
| Bias (ZTD differences) [mm] | <0.1 | 0.1 | <0.1 | –0.2 | –0.2 | –0.4 |