View source for thm.radcorr

{{DavinciWiki_Function|
Calculate the [[radiance]] correction and [[emissivity]] offset values for a [[THEMIS]] radiance array.
 
Produces a 2x1x10 float array containing the radiance correction and em offset values for a given array. Values are minimized RMS differences of radiance from blackbody of same temperature. Uses inverse parabolic interpolation for minimization algorithm
 
This is the minimization function for [[autoradcorr]] and [[radcorr2]] used in standard THEMIS processing.
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Arguments: A small (100x100x1) THEMIS radiance array
 
Return Value: A 2x1xN float array, where N is the number of bands
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[[Syntax]]: thm.radcorr(radiance &#61; VAL [, bandlist &#61; STRING] [, ignore &#61; VAL] [, temp_rad_path &#61; STRING] [, b1 &#61; INT] [, b2 &#61; INT] [, space &#61; 1])
 
'radiance' - a small (50x50x10 pixels) array selected from the entire radiance array
 
'bandlist' - a list of THEMIS bands in radiance array. Default is ordered bands 1-10
 
'ignore' - the non-data value. Default is -32768
 
'temp_rad_path' -  the path and filename of the temperature vs radiance lookup table
 
'b1' -  the first band in the ordered list to search for the maximum brightness temperature. Default &#61; 3
 
'b2' -  the last band in the ordered list to search for the maximum brightness temperature. Default &#61; 9
 
'space' -  a binary flag to return a complete, bounded solution space
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 dv> a
 345x500x10 array of float, bsq format [6,900,000 bytes]
 
 dv> rc &#61; thm.radcorr(a[20:120,450:500])
 .2x1x10 array of double, bsq format [160 bytes]
 -2.93331e-06    0.874220
 
 -3.38604e-07    0.884298
 
 2.01230e-06     1.00053
 
 4.89527e-06     0.906034
 
 3.45005e-06     0.852073
 
 2.51699e-06     0.864984
 
 1.87052e-06     0.899031
 
 8.77423e-07     0.940794
 
 4.50610e-06     0.926166
 
 0.00000         0.00000

or, a more verbose example:

 dv> rc &#61; thm.radcorr(a[20:120,450:500],ignore&#61;-32768,b1&#61;4,b2&#61;6)
 .2x1x10 array of double, bsq format [160 bytes]
 -4.34115e-06    0.983762
 
 -1.71475e-06    0.994783
 
 1.74100e-07     1.10584
 
 1.88402e-06     0.998468
 
 5.69619e-07     0.931107
 
 -5.51093e-07    0.938657
 
 -1.66467e-06    0.971046
 
 -2.65994e-06    1.01136
 
 1.08694e-06     0.991761
 
 0.00000         0.00000
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*[[radcorr2]]
*[[autoradcorr]]
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[[category:Functions]]
[[category:Modules]]
[[category:THEMIS Science]]