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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

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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