The SYN branch of SENTINEL-3 processing is a synergy of OLCI OL_1_EFR and SLSTR SL_1_RBT products.
The SYN product types are divided into six main products:
| Product type | Description | Availability to the User | Product Level |
| SY_1_MISR__ | Correspondence and collocation grids between OLCI/SLSTR acquisition and image grid and SYN Level 2 internal grid (i.e. OLCI instrument grid) | Not Available | Level 1 |
| SY_2_SYN___ | Surface Reflectance and Aerosol parameters over Land | Available | Level 2 |
| SY_2_VGP___ | 1 km VEGETATION-Like product (~VGT-P) - TOA Reflectance | ||
| SY_2_VGK___ | Surface reflectance over Land– used as input for VG-S product | ||
| SY_2_VG1___ | 1 km VEGETATION-Like product (~VGT-S1) 1 day synthesis surface reflectance and NDVI | ||
| SY_2_V10___ | 1 km VEGETATION-Like product (~VGT-S10) 10 day synthesis surface reflectance and NDVI | ||
| SY_2_AOD___ | Global Aerosol parameter over land and sea on super pixel resolution (4.5 km x 4.5 km) |
Level-1
NOTE: Level-1 product is not disseminated to Users.
SY_1_MISR is the output of the SYN Level-1 processing. The Level-1 product provides the correspondence grids between OLCI reference channel in the acquisition geometry and the others OLCI and SLSTR channels in their L1B image grids.
Level-2
- SY_2_SYN : surface reflectances for all SYN channels and aerosol parameters over Land
- SY_2_VGK : surface reflectance associated with VGT channels and NDVI over land
NOTE: The SY_2_VGK product is the input of the VGT-S software, and are NOT disseminated to Users
- SY_2_VGP : SPOT continuity products providing TOA reflectances
- SY_2_VG1 SPOT continuity products providing maximum NDVI value composite received during 1 day
- SY_2_V10 SPOT continuity products providing maximum NDVI value composite received during 10 days
- SY_2_AOD Global product over land and sea providing Aerosol optical thickness, surface reflectance and several aerosol characteristics on a wider resolution (4.5 km).
Figure 1: Synergy Product Tree
The SYNERGY (SY_2_..) products are distributed as STC products (using OLCI and SLSTR L1 PDUs) and as NTC products using consolidated OLCI L1 and SLSTR L1 orbits as inputs.