Moothly Climatology Emissivity Spectral Data with spatial grids 
of 0.25-deg lat.-long. based on IASI data of 
     MetOp-A Data from Jun 1, 2007 to Dec 31, 2016
     MetOp-B Data from Aug 1, 2013 to Jan 31, 2025
     MetOp-C Data from Jul 1, 2019 to Jan 31, 2025

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Eigenvector file : IASI_B_EV_FUNC_GLOBAL_V4.bin
File format type : unformatted, direct-access
     Record size : 8461 words, 64-bit (big-endian)
        Record # : 71

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 Emis-Func files : MFEMI_MONTHxx_y_V5P.bin
File format type : unformatted, direct-access
     Record size : 16 words, 32-bit (big-endian)
        Record # : 1036800 (e.g., 1440*720)
         word 01 : Surf Type (1=over land; 0=over water)
         word 02 : Latitude (deg.)
         word 03 : Longitude (deg.)
         word 04 : Surf Press (mb)
         word 05 : Surf Skin Temp (K)
      word 06-15 : Surf Emis Func Reg Coeff (i.e., PC Scores)
         word 16 : # of sample used in the grid

  xx = month of the year
   y = A, data are from MetOp ascending node
   y = D, data are from MetOp deqcending node
   y = C, data are from MetOp ascending and descending combined node

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      F77 reader : emis_sample_reader.f
   Matlab reader : emis_sample_reader.m

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      References : https://doi.org/10.1109/TGRS.2010.2051036
                   https://doi.org/10.1109/JSTARS.2013.2238892
                   https://doi.org/10.1117/1.JRS.12.016030
                   https://doi.org/10.1109/JSTARS.2020.3046421

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          Credit : If this dataset contributes to your research,
                   please consider including Dr. Daniel K. Zhou of
                   NASA Langley Research Center as your coauthor or
                   giving credit in the acknowledgement when you
                   publish your research. Thanks!

   Contact email : dankzhou2@yahoo.com
		   xu.liu-1@nasa.gov
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