3.2. Output Products

3.2.1. MERIS

The MERIS L1c output products which can be derived using the ICOL+ processor are:

MERIS L1c radiances: The MERIS radiances for bands 1-15 corrected for the adjacency effect. This product can be retrieved in either original .N1 format or BEAM DIMAP format (user option).

OR alternatively (user option):

MERIS L1c TOA reflectances: AE corrected radiances for bands 1-15 converted to TOA reflectances. This product is provided in BEAM DIMAP format. Within this product, the following quantities are optionally provided (user option):
- TOA reflectances (bands 1-15) corrected for AE (Rayleigh part of correction only)
- TOA reflectances (bands 1-15) corrected for AE (Rayleigh and aerosol parts of correction)
- AE Rayleigh correction term (bands 1-15)
- AE aerosol correction term (bands 1-15)
- Angstrom coefficient and aerosol optical thickness at 865nm.
- 'land_flag_ray_conv': Binary land-water mask smoothed onto interval [0,1] using Rayleigh weighting function.
- 'land_flag_aer_conv': Binary land-water mask smoothed onto interval [0,1] using aerosol weighting function.
- 'cloud_flag_ray_conv': Binary cloud mask smoothed onto interval [0,1] using Rayleigh weighting function.
- 'cloud_flag_aer_conv': Binary cloud mask smoothed onto interval [0,1] using aerosol weighting function.

Flag bands:

MERIS L1 flag band

The coding of the MERIS L1 flags is listed in Table 3.1.

Table 3.1. MERIS L1 flags

Name	Value	Description
COSMETIC	1	Pixel is cosmetic
DUPLICATED	2	Pixel has been duplicated (filled in)
GLINT_RISK	4	Pixel has glint risk
SUSPECT	8	Pixel is suspect
LAND_OCEAN	16	Pixel is over land, not ocean
BRIGHT	32	Pixel is bright
COASTLINE	64	Pixel is part of a coastline
INVALID	128	Pixel is invalid

ICOL aerosol retrieval flag band (not for patched N1 file, see Section 4.1)

The coding of the ICOL aerosol retrieval flags is listed in Table 3.2.

Table 3.2. ICOL aerosol retrieval flags (MERIS)

Name	Value	Description
bad_aerosol_model	1	No appropriate aerosol model could be applied for given pixel
bad_aot_model	2	No appropriate AOT model could be applied for given pixel
high_turbid_water	4	Turbidity was identified as high for this pixel
sunglint	8	Sun glint present in this pixel

Adjacency effect flag band (only in case of TOA reflectances output)

The coding of the adjacency effect flags is listed in Table 3.3.

Table 3.3. Adjacency effect flags (MERIS)

Name	Value	Description
ae_mask_rayleigh	1	Pixel is inside Rayleigh AE correction mask
ae_mask_aerosol	2	Pixel is inside aerosol AE correction mask
landcons	4	Consolidated land pixel
cloud	8	Cloud pixel
ae_applied_rayleigh	16	Rayleigh AE correction was applied to this pixel
ae_applied_aerosol	32	Aerosol AE correction was applied to this pixel
alpha_out_of_range	64	Alpha value is out of range for this pixel
aot_out_of_range	128	AOT value is out of range for this pixel
high_turbid_water	256	Turbidity was identified as high for this pixel
sunglint	512	Sun glint present in this pixel

3.2.2. LANDSAT

The LANDSAT TM output products which can be derived using the ICOL+ processor are:

LANDSAT TM L1c radiances: The LANDSAT TM radiances for bands 1-5 and 7 corrected for the adjacency effect. This product is provided in BEAM DIMAP format. It contains the same bands as the GEOTIFF input product.
LANDSAT TM L1g radiances: The LANDSAT TM radiances for bands 1-7 downscaled to the AE correction grid. This product is provided in BEAM DIMAP format. Processing time can be saved if this product is computed once and then re-used as input for different AE correction processes with varying user options.

LANDSAT TM L1g flag bands: The LANDSAT TM cloud and land classification flags as used for the AE correction (i.e. downscaled to the AE correction grid). This product is provided in BEAM DIMAP format.

The coding of the cloud classification flag is listed in Table 3.4.

Table 3.4. Cloud classification flags (Landsat TM)

Name	Value	Description
F_CLOUD	0	Pixel was finally specified as cloudy (if all flags below are set)
F_BRIGHT	1	Brightness flag (set if TM3 < BT)
F_NDVI	2	NDVI flag (set if NDVI < NDVIT_CLOUD, with NDVI = (TM4 - TM3)/(TM4 + TM3))
F_NDSI	4	NDSI flag (set if NDSI < NDSIT, with NDSI = (TM2 - TM5)/(TM2 + TM5))
F_TEMP	8	Temperature flag (set if TM6 < TM6T_CLOUD)

The coding of the land classification flag is listed in Table 3.5.

Table 3.5. Land classification flags (Landsat TM)

Name	Value	Description
F_LANDCONS	0	Pixel was classified as land
F_LOINLD	1	Pixel was classified as inland waters (currently no algorithm implemented and set to false)
F_NDVI	2	NDVI flag (set if NDVI < NDVIT_LAND, with NDVI = (TM4 - TM3)/(TM4 + TM3))
F_TEMP	8	Temperature flag (set if TM6 > TM6T_LAND (summer), TM6 < TM6T_LAND (winter))
F_ICE	16	Pixel was classified as ice (currently no algorithm implemented and set to false)