Product documentation

Product definition document:

PDD_SAPHIR-L2-RH_V1_R5.pdf (updated in January 2017)

Version history:

Version 1.00: Released July 2015. Original version
Version 2.00: Released November 2015. Modification of format, minor correction in algorithm over land.
Version 3.00: Released March 2017. Compared to the RH estimation scheme used in Version 2.00 which relied on Normal distributions, Version 3.00 product relies on a Beta distribution as its compact support and allowance for asymmetries about the mean are more favorable for describing the relative humidity. The estimation of parameters also provides a characterization of the retrieval uncertainty of RH for every observing pixel of SAPHIR
Version 3.01: Released July 2018. In this new version, the quality flags have been re-defined in order to take into account situations where the RH values result from an extrapolation of the retrieval model, and thus can be reasonably questioned. The valid range is considered to be 25% below/above the training range of the model. Those extrapolated data are now considered as missing, and a new quality flag is introduced

File description: SAPHIR-L2-RH


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 [4150] NONE NONE NONE NONE NONE NONE NONE
POSIX_Date_Scan float64 [nscan] second NONE 1.0 0.0 99999.0 -999.9 POSIX_Date_Scan
Latitude float32 [nscan,
npix]		 deg [-90.0, 90.0] 1.0 0.0 99999.0 -999.900024414 Latitude
Longitude float32 [nscan,
npix]		 deg [-180.0, 180.0] 1.0 0.0 99999.0 -999.900024414 Longitude
Surface_flag int16 [nscan,
npix]		 None [0, 1] 1.0 0.0 32767 -99 Surface_flag
HONG_flag int16 [nscan,
npix]		 None [0, 15] 1.0 0.0 32767 -99 HONG_flag
ClrPixel_flag int16 [nscan,
npix]		 None [0, 1] 1.0 0.0 32767 -99 ClrPixel_flag
End of group : Geolocation_Fields
Beginning of group : Data_Fields
RH float32 [nscan,
npix,
nlayer]		 % [0.0, 100.0] 1.0 0.0 99999.0 -999.900024414 RH
Error_Standard_Deviation float32 [nscan,
npix,
nlayer]		 % [0.0, 100.0] 1.0 0.0 99999.0 -999.900024414 Error_Standard_Deviation
UNCERTAINTY float32 [nscan,
npix,
nlayer]		 % [0.0, 100.0] 1.0 0.0 99999.0 -999.900024414 UNCERTAINTY
MEDIAN float32 [nscan,
npix,
nlayer]		 % [0.0, 100.0] 1.0 0.0 99999.0 -999.900024414 MEDIAN
ALPHA float32 [nscan,
npix,
nlayer]		 None NONE 1.0 0.0 99999.0 -999.900024414 ALPHA
BETA float32 [nscan,
npix,
nlayer]		 None NONE 1.0 0.0 99999.0 -999.900024414 BETA
Quality_Index int32 [nscan,
npix]		 None NONE 1.0 0.0 2147483647 -999 Quality_Index
End of group : Data_Fields



Product global attributes

Global attribute DataType Dimensions Value
File_Name string 1 MT1_L2-RH-SAPSL1A2-1.07_2017-03-01T12-24-41_V3-00.hdf
ICARE_ID string 1 2017-03-01T12:24:40
Product_Description string 1 Relative Humidity Profile and its conditional error PDF: The relative humidity profile retrieval algorithm coupled with the estimated standard deviation parameter of a Gaussian function describing the conditional error PDF are used within the Megha-Tropiques framework and is called ARPIA. See more details in Sivira et al. (2014) and R. Sivira (PhD these, 2013) respectively.
HDF_Version string 1 HDF Version 4.2 Release 11, February 5, 2015
Beginning_Acquisition_Date string 1 2017-03-01T12:24:41
End_Acquisition_Date string 1 2017-03-01T14:17:58
North_Bounding_Latitude float32 1 27.4399986267
South_Bounding_Latitude float32 1 -28.0799999237
West_Bounding_Longitude float32 1 180.0
East_Bounding_Longitude float32 1 -179.989990234
Nadir_Pixel_Size string 1 Resolution of relative humidity pixels : Same as SAPHIR.
Software_Version string 1 3.0
Product_Version string 1 V3-00
Production_Center string 1 ICARE
Production_Date string 1 2017/03/28 16:33:47
Attributes_Info string 1 None
Sensors string 1 SAPHIR
Input_Files string 1 MT1SAPSL1A2_1.07_000_1_18_I_2017_03_01_12_24_40_2017_03_01_14_17_57_27849_27851_288_11_13_BL3_00.h5
Ancillary_Files string 1 CFGMODS_SAPHIR_V3-00.h5
Mission string 1 Megha-Tropiques
Product_Name string 1 SAPHIR-L2-RH
Scientific_Software_Version string 1 3.0
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)
Layers string 1 There are 6 layers for relative humidity defined by their pressure boundaries as follows: L1 = 100-200 hPa / L2 = 250-350 hPa / L3 = 400-600 hPa / L4 = 650-700 hPa / L5 = 750-800 hPa / L6= 850-950 hPa
GEO_AuxFile_Version string 1 1_18
RAD_AuxFile_Version string 1 1_18

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