IMAPP MODIS Direct Broadcast Polar Inversion
  Depth and Inversion Strength  Product Description
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  The IMAPP Inversion software produces retrievals of inversion strength
  and inversion depth over the polar regions. The inputs to the software
  are the MODIS 1 km resolution L1B file and the MODIS 1 km Cloud Mask 
  file. The software was developed by Yinghui Liu, and converted to C
  by Jerry Straka, under the directory of Dr. Jeffrey Key, NOAA/NESDIS and 
  integrated into IMAPP by Kathleen Strabala, kathy.strabala@ssec.wisc.edu.

  For a description of the algorithm, please see:

  Liu, Y. and J. Key, 2003, Detection and analysis of clear sky, 
    low-level atmospheric temperature inversions with MODIS, J. Atmos. 
    Ocean. Tech., 20, 1727-1737.

  Output for this product is a flat binary file and an HDF4 file.

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Binary Output Files
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  There are two binary output files associated with this software.  
  The *inversion_strength.bin file contains 2 byte integer values
  scaled by .1 at 1 km resolution in degrees K. The size of the file
  will depend upon the size of the pass that is being processed
  (1354 x number_of_lines x 2 bytes).

   Example file name:  a1.11194.0633.inversion_strength.bin
   Two byte integers
   Scale factor:  0.1
   1 parameter  -  Inversion Strength Degrees K
   1 km pixel resolution

  The *inversion_depth.bin file contains 2 byte integer values
  scaled by .1 at 1 km resolution in meters. The size of the file
  will depend upon the size of the pass that is being processed
  (1354 x number_of_lines x 2 bytes).

   Example file name:  a1.11194.0633.inversion_depth.bin
   Two byte integers
   Scale factor:  0.1
   1 parameter  -  Inversion Depth in meters (m)
   1 km pixel resolution

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HDF4 OUTPUT FILE
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  The HDF4 output file (*inversion.hdf) contains 4 arrays.  Latitude, 
  Longitude at 5 km resolution and Inversion Strength in degrees K and 
  Inversion Depth in meters at 1 km resolution. Inversionn Strength and
  Inversion Depth arrays are stored as 2 Byte Integers, and can be 
  converted to actual values by multiplying by the scale factor of 0.1.

  The Latitude and Longitude arrays are stored as 4 byte float values
  at 5 km resolution.
  
  Example filename:  a1.11194.1737.inversion.hdf


 (Example ncdump -h of an IMAPP Inversion HDF file)

netcdf a1.11194.1737.inversion.hdf {
dimensions:
        Cell_Along_Swath_5km = 896 ;
        Cell_Across_Swath_5km = 271 ;
        Cell_Along_Swath_1km = 4480 ;
        Cell_Across_Swath_1km = 1354 ;

variables:
        float Latitude(Cell_Along_Swath_5km, Cell_Across_Swath_5km) ;
                Latitude:_FillValue = -999.98999f ;
        float Longitude(Cell_Along_Swath_5km, Cell_Across_Swath_5km) ;
                Longitude:_FillValue = -999.98999f ;
        short Inversion_Depth(Cell_Along_Swath_1km, Cell_Across_Swath_1km) ;
                Inversion_Depth:units = "m" ;
                Inversion_Depth:scale_factor = 0.1 ;
                Inversion_Depth:add_offset = 0. ;
                Inversion_Depth:valid_range = 0s, 20000s ;
                Inversion_Depth:_FillValue = -10s ;
        short Inversion_Strength(Cell_Along_Swath_1km, Cell_Across_Swath_1km)
;
                Inversion_Strength:units = "C" ;
                Inversion_Strength:scale_factor = 0.1 ;
                Inversion_Strength:add_offset = 0. ;
                Inversion_Strength:valid_range = 0s, 1000s ;
                Inversion_Strength:_FillValue = -10s ;
}