Product Documentation

Product definition document:

PDD_SCA_L2-FLUX_V1_R2.pdf (updated in March 2019)

Version history:

Version 1.00: Released October 2013. Original version
Version 2.00: Released January 2015. Minor correction of the albedo calculation. Minor format corrections.
Version 2.01: Released March 2019. 1. Relative Azimuth angle: The β angle, the angle between the direction of the Sun and the orbit plane varies from -45° to 45° for Megha-Tropiques platform. It is necessary to turn the satellite round (flip maneuver) so that the solar panels are more illuminated (see Handbook of Satellite orbits from Michel Capderou).
This flip maneuver is made when the sign of β changes , and the referential for calculating the azimuth angle too. We calculate the new relative azimuth angle to have the same convention of azimuth calculation: the Sun always have a relative azimuth angle of 180°.
2. Auxiliary Channels: The two auxiliary channels radiances (Infrared and visible) are added in the L2B files ( TOA_IR_Rad and TOA_VIS_Rad)

File description: SCARAB-L2-FLUX


Product file format: HDF4

Product datasets

Dataset DataType Dimensions units valid_range scale_factor add_offset _FillValue Missing_Output long_name
Beginning of group : Geolocation_Fields
UTC_Date_Scan struct [748] NONE NONE NONE NONE NONE NONE NONE
Scan_StartTime float64 [nscan] N/A NONE 1.0 0.0 99999.0 999999.0 Scan_StartTime
POSIX_Date_Scan float64 [nscan] second NONE 1.0 0.0 99999.0 999999.0 POSIX_Date_Scan
Colatitude_Nadir uint16 [nscan] Degrees [6000, 12000] 0.01 0.0 65535 65534 Colatitude_Nadir
Longitude_Nadir uint16 [nscan] Degrees [0, 36000] 0.01 0.0 65535 65534 Longitude_Nadir
Colatitude_for_radiance_at_surface uint16 [nscan,
npix]		 Degrees [6000, 12000] 0.01 0.0 65535 65534 Colatitude_for_radiance_at_surface
Longitude_for_radiance_at_surface uint16 [nscan,
npix]		 Degrees [0, 36000] 0.01 0.0 65535 65534 Longitude_for_radiance_at_surface
Colatitude_for_radiance_at_TOA uint16 [nscan,
npix]		 Degrees [6000, 12000] 0.01 0.0 65535 65534 Colatitude_for_radiance_at_TOA
Longitude_for_radiance_at_TOA uint16 [nscan,
npix]		 Degrees [0, 36000] 0.01 0.0 65535 65534 Longitude_for_radiance_at_TOA
End of group : Geolocation_Fields
Beginning of group : Data_Fields
Scan_Gain float32 [nscan,
nchannel]		 N/A NONE 1.0 0.0 99999.0 999999.0 Scan_Gain
Scan_Mode_Status int16 [nscan] N/A NONE 1.0 0.0 32767 -32768 Scan_Mode_Status
Scan_QF uint16 [nscan] N/A NONE 1.0 0.0 65535 65534 Scan_QF
Scan_Number uint16 [nscan] N/A NONE 1.0 0.0 65535 65534 Scan_Number
Along_Track_diagonal_dimension uint16 [nscan,
npix]		 Meter [0, 20000] 10.0 0.0 65535 65534 Along_Track_diagonal_dimension
Across_Track_diagonal_dimension uint16 [nscan,
npix]		 Meter [0, 20000] 10.0 0.0 65535 65534 Across_Track_diagonal_dimension
Pixel_Orientation uint16 [nscan,
npix]		 Degrees [0, 36000] 0.01 0.0 65535 65534 Pixel_Orientation
Viewing_Zenith_Angle uint16 [nscan,
npix]		 Degrees [0, 9000] 0.01 0.0 65535 65534 Viewing_Zenith_Angle
Viewing_Azimuth_Angle uint16 [nscan,
npix]		 Degrees [0, 36000] 0.01 0.0 65535 65534 Viewing_Azimuth_Angle
Solar_Zenith_Angle uint16 [nscan,
npix]		 Degrees [0, 9000] 0.01 0.0 65535 65534 Solar_Zenith_Angle
Relative_Azimuth_Angle uint16 [nscan,
npix]		 Degrees [0, 36000] 0.01 0.0 65535 65534 Relative_Azimuth_Angle
Filtered_Radiance_for_Visible_Channel uint16 [nscan,
npix]		 W m-2 sr-1 [0, 12000] 0.01 0.0 65535 65534 Filtered_Radiance_for_Visible_Channel
Filtered_Radiance_for_Solar_Channel uint16 [nscan,
npix]		 W m-2 sr-1 [0, 42500] 0.01 0.0 65535 65534 Filtered_Radiance_for_Solar_Channel
Filtered_Radiance_for_Total_Channel uint16 [nscan,
npix]		 W m-2 sr-1 [0, 50000] 0.01 0.0 65535 65534 Filtered_Radiance_for_Total_Channel
Filtered_Radiance_for_Infrared_Channel uint16 [nscan,
npix]		 W m-2 sr-1 [0, 3000] 0.01 0.0 65535 65534 Filtered_Radiance_for_Infrared_Channel
Filtered_Radiance_for_Synthetic_LW_Channel uint16 [nscan,
npix]		 W m-2 sr-1 [0, 24000] 0.01 0.0 65535 65534 Filtered_Radiance_for_Synthetic_LW_Channel
Unfiltered_SW_radiance uint16 [nscan,
npix]		 W m-2 sr-1 [0, 42500] 0.01 0.0 65535 65534 Unfiltered_SW_radiance
Unfiltered_LW_radiance uint16 [nscan,
npix]		 W m-2 sr-1 [0, 12000] 0.01 0.0 65535 65534 Unfiltered_LW_radiance
QF_RD_Vis uint16 [nscan,
npix]		 N/A NONE 1.0 0.0 65535 65534 QF_RD_Vis
QF_RD_SW uint16 [nscan,
npix]		 N/A NONE 1.0 0.0 65535 65534 QF_RD_SW
QF_RD_Total uint16 [nscan,
npix]		 N/A NONE 1.0 0.0 65535 65534 QF_RD_Total
QF_RD_IR uint16 [nscan,
npix]		 N/A NONE 1.0 0.0 65535 65534 QF_RD_IR
QF_RD_LW_Synthetic uint16 [nscan,
npix]		 N/A NONE 1.0 0.0 65535 65534 QF_RD_LW_Synthetic
Geotype uint8 [nscan,
npix]		 N/A [0, 20] 1.0 0.0 255 254 Geotype
SEL_TOA_SW_Flux float32 [nscan,
npix]		 W m-2 [0.0, 1000.0] 1.0 0.0 99999.0 999999.0 SEL_TOA_SW_Flux
SEL_TOA_LW_Flux float32 [nscan,
npix]		 W m-2 [0.0, 500.0] 1.0 0.0 99999.0 999999.0 SEL_TOA_LW_Flux
SEL_Scene_Identification uint8 [nscan,
npix]		 N/A [0, 12] 1.0 0.0 255 254 SEL_Scene_Identification
SEL_Albedo float32 [nscan,
npix]		 N/A [0.0, 1.0] 1.0 0.0 99999.0 999999.0 SEL_Albedo
SANN_TOA_SW_Flux_(1) float32 [nscan,
npix]		 W m-2 [0.0, 1000.0] 1.0 0.0 99999.0 999999.0 SANN_TOA_SW_Flux_(1)
SANN_TOA_LW_Flux_(1) float32 [nscan,
npix]		 W m-2 [0.0, 500.0] 1.0 0.0 99999.0 999999.0 SANN_TOA_LW_Flux_(1)
SANN_Albedo_(1) float32 [nscan,
npix]		 N/A [0.0, 1.0] 1.0 0.0 99999.0 999999.0 SANN_Albedo_(1)
SANN_TOA_SW_Flux_(2) float32 [nscan,
npix]		 W m-2 [0.0, 1000.0] 1.0 0.0 99999.0 999999.0 SANN_TOA_SW_Flux_(2)
SANN_TOA_LW_Flux_(2) float32 [nscan,
npix]		 W m-2 [0.0, 500.0] 1.0 0.0 99999.0 999999.0 SANN_TOA_LW_Flux_(2)
SANN_Albedo_(2) float32 [nscan,
npix]		 N/A [0.0, 1.0] 1.0 0.0 99999.0 999999.0 SANN_Albedo_(2)
SANN_SW_Scene_Identification uint8 [nscan,
npix]		 N/A [0, 5] 1.0 0.0 255 254 SANN_SW_Scene_Identification
SANN_LW_Scene_Identification uint8 [nscan,
npix]		 N/A [0, 4] 1.0 0.0 255 254 SANN_LW_Scene_Identification
Quality_Index uint8 [nscan,
npix]		 N/A NONE 1.0 0.0 255 254 Quality_Index
End of group : Data_Fields



Product global attributes

Global attribute DataType Dimensions Value
File_Name string 1 MT1_L2-FLUX-SCASL1A2-1.06_2015-01-01T12-42-24_V2-00.hdf
Icare_ID string 1 20150101124230
Mission string 1 Megha-Tropiques
Product_Name string 1 L2-FLUX-SCASL1A2-1.06
Product_Description string 1 The product contains one orbit of estimated top of the atmosphere (TOA) SW and LW fluxes as well as scene identifications and some input data (radiances, angles...). In this product, we have two different TOA fluxes: one derived from SEL algorithm, based on the ERBE ADMs (Suttles et al. 1988, 1989) and corresponding inversion methods (Wielicki and Green 1989)) and one derived from SANN algorithm, ScaRaB Artificial Neural Network. You can fin a description of this approach on Viollier et al. (2009).
HDF_Version string 1 HDF Version 4.2 Release 5, February 17, 2010
Beginning_Acquisition_Date string 1 2015-01-01T12:42:24
End_Acquisition_Date string 1 2015-01-01T13:57:06
Nadir_Pixel_Size string 1 approximately 40 km squared
Software_Version string 1 3.1.1
Product_Version string 1 V2-00
Production_Center string 1 ICARE
Production_Date string 1 2015/03/20 14:19:52
North_Bounding_Latitude float32 1 29.8400001526
South_Bounding_Latitude float32 1 -29.3199996948
West_Bounding_Longitude float32 1 44.1699981689
East_Bounding_Longitude float32 1 292.170013428
Sensors string 1 MT/SCARAB
Input_Files string 1 MT1SCASL1A2_1.06_000_9_16_I_2015_01_01_12_41_24_2015_01_01_13_57_06_16633_16634_172_47_48_KRU_00.h5
Ancillary_Files string 1 ALBE8501; FLUE8501; msw_txt; geoe8501; mwinter_txt
list_of_ECMWF_file string 1 ECMWF_201501020000_v1.3.0_1deg_AN.grb; ECMWF_201501011800_v1.3.0_1deg_AN.grb; ECMWF_201501011200_v1.3.0_1deg_AN.grb; ECMWF_201501010900_v1.3.0_1deg_FC_201412311200.grb; ECMWF_201501011500_v1.3.0_1deg_FC_201501010000.grb; ECMWF_201501012100_v1.3.0_1deg_FC_201501010000.grb
Scan_Number uint16 1 748
Sample_Number uint16 1 51
nb_invalid_scan uint16 1 0
Orbit_Start_Number string 1 16633
Orbit_End_Number string 1 16634
Orbit_Revolution_Number string 1 47
Nskip string 1 NONE
Skip_Start_Scan_Number string 1 NONE
Skip_End_Scan_Number string 1 NONE
SLConf string 1 110010
Flip_Start_Scan_Number string 1 NONE
Flip_End_Scan_Number string 1 NONE
Man_Start_Scan_Number string 1 NONE
Man_End_Scan_Number string 1 NONE
Rad_Cal_File_Version string 1 9_16
Geom_Cal_File_Version string 1 9_16
QF_Product string 1 100.00
Proc_Param_File_Version string 1 ISRO_SAC_DP-MT1-SCAL1A2SW-VER-1.06F000(ISRO_SAC_DP-MT1-SW_PROD_ID-100_01_L1A2_011_01_L1A3-0007000)
A_coefficient string 1 0.9160
Level1_Version string 1 ISRO_SAC_DP-MT1-SCAL1A2SW-VER-1.06F000(ISRO_SAC_DP-MT1-SW_PROD_ID-100_01_L1A2_011_01_L1A3-0007000)

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