Product Documentation

Product definition document:

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

Version history:

Version 2.00: Released November 2015. 1st version for SAPHIR-L2B-RH
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-L2B-RH


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
RH float32 [time*,
layer,
latitude,
longitude]		 % [0.0, 100.0] 1.0 0.0 99999.0 NONE RH
RH_Error_Standard_Deviation float32 [time*,
layer,
latitude,
longitude]		 % [0.0, 100.0] 1.0 0.0 99999.0 NONE RH_Error_Standard_Deviation
RH_Quality float32 [time*,
layer,
latitude,
longitude]		 % [0.0, 100.0] 1.0 0.0 99999.0 NONE RH_Quality

* : unlimited dimension



Product global attributes

Global attribute DataType Dimensions Value
File_Name string 1 MT1_L2B-RH-SAPSL1A2-1.07_2017-03-01T12-24-41_V3-00.nc
Product_Description string 1 Level-2B 1deg grid-wise.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.
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 V3-00
Production_Center string 1 ICARE
Production_Date string 1 2017/03/29 08:16:35
Sensors string 1 SAPHIR
Mission string 1 Megha-Tropiques
Input_Files string 1 MT1_L2-RH-SAPSL1A2-1.07_2017-03-01T12-24-41_V3-00.hdf
Level1_File 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
NETCDF_Version string 1 3
RAD_AuxFile_Version string 1 1_18
GEO_AuxFile_Version string 1 1_18
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 3.0
Beginning_Acquisition_Date string 1 2017-03-01T12:24:41
End_Acquisition_Date string 1 2017-03-01T14:17:58
Product_Name string 1 MT1_L2B-RH-SAPSL1A2-1.07
Icare_ID string 1 2017-03-01T12:24:40

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