Radiometric Resolution

In nominal conditions, the SENTINEL-3 SYN Level-1 product (SY_1_MISR) contains 30 files, including manifest file. Each file is corresponding to an OLCI or SLSTR channel taken into account in the SYN processing.

The SYN Level-2 User products are produced at OLCI full resolution, taken into account only the daylight part of the orbit and pixels over land.

26 radiometric channels are considered : the 16 first one are related to the used OLCI channels (i.e all OLCI channels except Oa13, Oa14, Oa15, Oa19 and Oa20). Then, SLSTR used channels (S1, S2, S3, S5 and S6) are divided into two groups: radiometric measurements associated with nadir view and the ones associated with oblique view.

These channels are listed in the first column of the table below.

Table 1: Input SLSTR and OLCI radiometric channels in the SYN L2 User product

SYN CHANNEL

CENTRAL WAVELENGTH (nm)

WIDTH (nm)

INSTRUMENT CHANNEL

SYN01

400

15

Oa01

SYN02

412.5

10

Oa02

SYN03

442.5

10

Oa03

SYN04

490

10

Oa04

SYN05

510

10

Oa05

SYN06

560

10

Oa06

SYN07

620

10

Oa07

SYN08

665

10

Oa08

SYN09

673.75

7.5

Oa09

SYN10

681.25

7.5

Oa10

SYN11

708.75

10

Oa11

SYN12

753.75

7.5

Oa12

SYN13

778.75

15

Oa16

SYN14

865

20

Oa17

SYN15

885

10

Oa18

SYN16

1 020

40

Oa21

SYN17

555

20

S1 (nadir view)

SYN18

659

20

S2 (nadir view)

SYN19

865

20

S3 (nadir view)

SYN20

1 610

60

S5 (nadir view)

SYN21

2 250

50

S6(nadir view)

SYN22

555

20

S1 (oblique view)

SYN23

659

20

S2 (oblique view)

SYN24

865

20

S3 (oblique view)

SYN25

1 610

60

S5 (oblique view)

SYN26

2 250

50

S6 (oblique view)

 

The VGT-P (SY_2_VGP___) and VGT-S products (SY_2_VG1___  and Y_2_V10___ ) include TOA and surface reflectances defined for VGT channels:

 


Table 2: Definition of VGT channels


VGT channel

Central Wavelength (nm)

Bandwidth (nm)

Combined SYN Level 2 channels

B0

450

20

SYN channel 2 and channel 3

B2

645

35

SYN channels 6 to 10

B3

835

55

SYN channels 13 to 16

MIR

1665

85

SYN channel 20 and channel 21

The SYN AOD product has also its own radiometric resolution based on a combination of OLCI and SLSTR ones. Aerosol characteristics are provided for 6 different channels


Table 3: Input SLSTR and OLCI radiometric channels in the SYN L2 User product


SYN AOD CHANNEL

CENTRAL WAVELENGTH (nm)

INSTRUMENT CHANNEL

SYN01

440

Oa03

SYN02

550

SLSTR S1

SYN03

670

SLSTR S2

SYN04

865

SLSTR S3

SYN05

1 600

SLSTR S5

SYN06

2 250

SLSTR S6

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