Minimize Level-2 SYN

The Level-2 SYN product (SY_2_SYN) is produced by the Global Synergy Level-1/2 software and contains surface reflectance and aerosol parameters over land.


Table 1: SYNERGY Level 2 product physical composition


Product Package Type

SY_2_SYN___

Description

Land surface reflectance and aerosol geophysical parameters

Product Level

Distribution Timeliness

Product Category

Application Domain

Spatial Resolution

2

NTC

User

LND

300 m

Product Dissemination Unit: Stripe

Number of Package components

Number of Measurement Data Files

Number of Annotation Data Files

Number of Representation Information Files

 

38

29

9

0

All measurement datasets are provided on the OLCI image grid, similar to the one included in the OLCI L1b product, consisting of N_COL_OLC x N_LINE_OLC pixels with:

  • N_COL_OLC = 4865 columns acquired
  • N_LINE_OLC = 60,000 lines acquired for one orbit

Some sub-sampled annotations and atmospheric datasets are provided on the OLCI tie-points grid.
The measurement data files included in this product provide:

  • Level-2 Surface Directional Reflectance (SDR) with their associated error estimates for the sun-reflective SLSTR channels (S1 to S6 for both nadir and oblique views) and for all OLCI channels, except for the oxygen absorption bands Oa14, Oa15, and the water vapour band Oa20
  • Level-2 aerosol optical thickness at 550 m (referenced as T550) with error estimates
  • Level-2 Angstrom coefficient (referenced as A550).

Several associated variables are also provided in annotation data files.

  • Aerosol Model Index Number (AMIN). This value is an integer number in the table of 40 aerosol models used for the atmospheric correction. A zero value indicates missing data.
  • Status flag computed by SYN Level-2 processing providing information about cloud, snow or land presence.
  • Flags corresponding to OLCI quality and classifications flags and to SLSTR exception summary and confidence flags.
  • DEM-corrected latitude, longitude and altitude.
  • OLCI time stamps.
  • Solar and viewing azimuth/zenith angles for each OLCI sub-sampled tie-point.
  • Some geophysical atmospheric data (derived from ECMWF files) such as the mean sea level pressure, the total column ozone and water vapour.

Table 2: Description of Level-2 SYN product


Variables

Description

Units

Input Bands

SDR

Atmospherically corrected Surface Directional Reflectance (also called Lambert Equivalent Reflectance (LER) or Bidirectional Reflectance Factor (BRF)).
Each dataset includes a single SYN channel

dimensionless

SLSTR S1 – S4, S6 channels
All OLCI channels except Oa14, Oa15 and Oa20

T550

Aerosol Optical Thickness (AOT)
at a wavelength of 550 nm

dimensionless

SLSTR S1 – S4, S6 channels
All OLCI channels except Oa14, Oa15 and Oa20

A550

Estimated Aerosol Angstrom Exponent at a reference waveband of 550 nm.

dimensionless

S1 – S4, S6 channels all OLCI channels except O14, 15 and O20