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 2.01: Released January 2015. Added an extra time dimension in the netcdf file. Minor format corrections.
Version 2.02: Released November 2015. The error standard deviation of UTH values is now included in each gridpoint weighted by their uncertainty; minor modification of format .

File description: SAPHIR-L2B-UTH


Product file format: NetCDF3

Product datasets

Dataset DataType Dimensions units valid_range scale_factor add_offset _FillValue Missing_Output long_name
time float64 [time*] seconds since 2011-10-12 00:00:00.000 NONE 1.0 0.0 99999.0 NONE time
layer int32 [layer] NONE NONE 1.0 0.0 2147483647 NONE layer
latitude float32 [latitude] Degrees_north [-29.5, 29.5] 1.0 0.0 99999.0 NONE latitude
longitude float32 [longitude] Degrees_east [0.5, 359.5] 1.0 0.0 99999.0 NONE longitude
Pixel_time float64 [time*,
latitude,
longitude]		 seconds since 2011-10-12 00:00:00.000 NONE 1.0 0.0 99999.0 NONE Pixel_time
UTH float32 [time*,
layer,
latitude,
longitude]		 % [0.0, 100.0] 1.0 0.0 99999.0 NONE UTH
UTH_Error_Standard_Deviation float32 [time*,
layer,
latitude,
longitude]		 % [0.0, 100.0] 1.0 0.0 99999.0 NONE UTH_Error_Standard_Deviation
UTH_Quality float32 [time*,
layer,
latitude,
longitude]		 % [0.0, 100.0] 1.0 0.0 99999.0 NONE UTH_Quality

* : unlimited dimension



Product global attributes

Global attribute DataType Dimensions Value
File_Name string 1 MT1_L2B-UTH-SAPSL1A2-1.07_2015-11-01T14-15-58_V2-02.nc
Product_Description string 1 Level-2B 1deg grid-wise.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)
North_Bounding_Latitude float64 1 30.0
South_Bounding_Latitude float64 1 -30.0
West_Bounding_Longitude float64 1 0.0
East_Bounding_Longitude float64 1 360.0
Nadir_Pixel_Size string 1 1.0 deg
Software_Version string 1 1.3.0
Product_Version string 1 V2-02
Production_Center string 1 ICARE
Production_Date string 1 2015/11/18 14:25:10
Sensors string 1 MT/SAPHIR
Mission string 1 Megha-Tropiques
Input_Files string 1 MT1_L2-UTH-SAPSL1A2-1.07_2015-11-01T14-15-58_V2-00.hdf
Level1_File string 1 MT1SAPSL1A2_1.07_000_1_17_I_2015_11_01_14_14_58_2015_11_01_16_12_38_20929_20930_216_75_76_KUX_00.h5
NETCDF_Version string 1 3
RAD_AuxFile_Version string 1 1_17
GEO_AuxFile_Version string 1 1_17
Level1_Version string 1 ISRO_SAC_DP-MT1-SAPL1A2SW-VER-1.07F000(ISRO_SAC_DP-MT1-SW_PROD_ID-111_11_L1A__111_11_L1A2-0008000)
Level2_Version string 1 1.3.0
Beginning_Acquisition_Date string 1 2015-11-01T14-15-58
End_Acquisition_Date string 1 2015-11-01T16-12-38
Product_Name string 1 MT1_L2B-UTH-SAPSL1A2-1.07
Icare_ID string 1 2015-11-01T14:15:58

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