In the table above, the resolution for “IW High Resolution L1 GRD” is 20x22 m (range x azimuth).
I also noticed in the user guide that “spatial resolution” is termed as the “system’s ability to distinguish between adjacent targets”. Does that mean that it is only a radiometric capability (20x22 m) and not the actual pixel resolution?
S-1 IW is already at 10m pixel spacing so no resampling is needed in your case. In simplified terms pixels are samples of the underlying radar reflectivity of the scene, and for Sentinel-1 you could place two identical scatterers 10m apart and they would appear a as single elongated scatterer, since the system is not able to resolve them as separate targets.
This idea of pixel resolution and pixel spacing seems to be not so straightforward.
The term “pixel spacing” seems to be what is common known as “spatial resolution”. So if this is 10x10 m, we expect the pixel to represent an area of 10x10 m on the ground. Like a LANDSAT pixel represents 30x30 m.
Once we understand this an then look at the term “resolution”, which is 20x22 m for IW mode in High Resolution L1 GRD, how do we connect both these numbers?
