Product documentation

Product definition document:

PDD_SAP_L2-UTH_V1_R4.pdf (updated in November 2015)

Version history:

Version 1.00: Released October 2013. Original version
Version 1.01: Released May 2014. The BT-to-UTH retrieval is performed after correction of the limb effect on the BTs. For this correction, the measured BTs at a given incident angle are redefined at an equivalent nadir viewing geometry, from a look-up-table. In V1.00 a step of 5° in incidence angle was used, whereas in the current V1.01 a step of 2° has been preferred.
Version 2.00: Released January 2015. Added UTH uncertainty. Minor format corrections.

File description: SAPHIR-L2-UTH


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
POSIX_Date_Scan float64 [nscan] second NONE 1.0 0.0 -99999.0 99999.0 POSIX_Date_Scan
UTC_Date_Scan struct [4180] NONE NONE NONE NONE NONE NONE NONE
Latitude float32 [nscan,
npix]
deg [-90.0, 90.0] 1.0 0.0 -99999.0 99999.0 Latitude
Longitude float32 [nscan,
npix]
deg [0.0, 360.0] 1.0 0.0 -99999.0 99999.0 Longitude
End of group : Geolocation_Fields
Beginning of group : Data_Fields
QUALITY_FLAG uint8 [nscan,
npix]
None [0, 1] 1.0 0.0 255 254 QUALITY_FLAG
FLAG_HONG uint8 [nscan,
npix]
None [0, 1] 1.0 0.0 255 254 FLAG_HONG
UTH float32 [nscan,
npix,
nlayer]
% [0.0, 100.0] 1.0 0.0 -99999.0 99999.0 UTH
Error_Standard_Deviation float32 [nscan,
npix,
nlayer]
% [0.0, 100.0] 1.0 0.0 -99999.0 99999.0 Error_Standard_Deviation
End of group : Data_Fields



Product global attributes

Global attribute DataType Dimensions Value
File_Name string 1 MT1_L2-UTH-SAPSL1A2-1.06_2015-01-01T13-52-31_V2-00.hdf
Icare_ID string 1 2015-01-01T13:52:32
Mission string 1 Megha-Tropiques
Product_Name string 1 L2-UTH-SAPSL1A2-1.06
Product_Description string 1 A Saphir-only scheme has been developed in order to derive the upper tropospheric humidity (UTHs) from the 3 upper channels (+/- 0.2 GHz, +/- 1.1 GHz and +/-2.8 GHz). This retrieval follows the method developed initially for IR measurements (6.3 microns) of the HIRS (e.g. Soden & Bretherton, 1993) and METEOSAT-MVIRI (e.g. Schmetz and Turpeinen, 1988) radiometers and recently applied to microwave observations (Spencer & Braswell, 1997; Buehler & John, 2005)
HDF_Version string 1 HDF Version 4.2 Release 5, February 17, 2010
Beginning_Acquisition_Date string 1 2015-01-01T13-52-31
End_Acquisition_Date string 1 2015-01-01T15-46-37
Nadir_Pixel_Size string 1 10 km
Software_Version string 1 1.3.0
Scientific_Software_Version string 1 1.3.0
Product_Version string 1 V2-00
Production_Center string 1 ICARE
Production_Date string 1 2015/03/20 11:36:37
North_Bounding_Latitude float32 1 28.1299991608
South_Bounding_Latitude float32 1 -27.3899993896
West_Bounding_Longitude float32 1 0.0
East_Bounding_Longitude float32 1 360.0
Sensors string 1 MT/SAPHIR
Input_Files string 1 MT1SAPSL1A2_1.06_000_9_16_I_2015_01_01_13_51_31_2015_01_01_15_46_37_16634_16635_172_48_49_KRU_00.h5
Ancillary_Files string 1 None
nb_invalid_scan uint16 1 0
Level1_Version string 1 ISRO_SAC_DP-MT1-SAPL1A2SW-VER-1.06F000(ISRO_SAC_DP-MT1-SW_PROD_ID-100_01_L1A2_011_01_L1A3-0007000)
RAD_AuxFile_Version string 1 9_16
GEO_AuxFile_Version string 1 9_16

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