The Sentinel-1 Level-0 products consist of compressed and unfocused SAR (Synthetic Aperture Radar) raw data. Level-0 products are the basis from which all other high-level products are produced. The data includes noise, internal calibration and echo source packets as well as orbit and attitude information. The Level-0 products are not made available by ESA

Sentinel-1 Level-1 focused data are the products intended for most data users and form a baseline product from which Level-2 products are derived. The processing steps involved to produce Level-1 data products include pre-processing, Doppler centroid estimation, single look complex focusing, and image and post-processing for generation of the SLC (Single Look Complex) and GRD (Ground Range) products as well as mode specific processing for assembling of multiple sub-swath products.

• Level-1 Single Look Complex (SLC) products consist of focused SAR data, geo-referenced using orbit and attitude data from the satellite, and provided in slant-range geometry. Slant range is the natural radar range observation coordinate, defined as the line-of-sight from the radar to each reflecting object. The products are in zero-Doppler orientation where each row of pixels represents points along a line perpendicular to the sub-satellite track.
• Level-1 Ground Range Detected (GRD) products consist of focused SAR data that has been detected, multi-looked and projected to ground range using the Earth ellipsoid model WGS84. The ellipsoid projection of the GRD products is corrected using the terrain height specified in the product general annotation. The terrain height used varies in azimuth but is constant in range (but can be different for each IW/EW sub-swath).

Sentinel-1 Level-2 consists of geolocated geophysical products such as: Ocean (OCN) products for wind, wave and currents applications may contain the following geophysical components derived from the SAR data: Ocean Wind field (OWI), Ocean Swell spectra (OSW), Surface Radial Velocity (RVL).

• The OWI component is a ground range gridded estimate of the surface wind speed and direction at 10 m above the surface, derived from SM, IW or EW modes.
• The OSW component is a two-dimensional ocean surface swell spectrum and includes an estimate of wind speed and direction per swell spectrum. The OSW component provides continuity measurement of SAR swell spectra at C-band.
• The RVL surface radial velocity component is a ground range gridded difference between the measured Level-2 Doppler grid and the Level-1 calculated geometrical Doppler. The RVL component provides continuity of the ASAR Doppler grid.