Coordinate reference system¶
All delivered products use the WGS 84 geographic coordinate system (EPSG:4326) with a Plate Carrée (equidistant cylindrical) projection.
| Property | Value |
|---|---|
| Ellipsoid | WGS 84 |
| Semi-major axis | 6,378,137 m |
| Inverse flattening | 298.257223563 |
| Prime meridian | Greenwich (0.0°) |
| Projection | Latitude / Longitude (Plate Carrée) |
| EPSG code | 4326 |
Spatial resolution and grid spacing¶
Spatial resolution refers to the size of the smallest feature detectable by a sensor (the 3 dB footprint). Grid spacing is the interval of the regular grid to which observations are resampled.
| Product | Sensor resolution | Grid spacing | Grid cells |
|---|---|---|---|
| D-MSSM | ~36 km (SMAP), variable (GNSS-R) | 0.054° (~6 km) | Global: 6666 × 2760 |
| D-ESSM | 500 m (Sentinel-1 derived) | 0.0045° (~500 m) | Regional |
| D-HSSM | 100 m (Sentinel-1 derived) | 0.0009° (~100 m) | Custom regions |