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Last Post 05 Feb 2011 02:42 AM by  anon
Spectral similarity/distance/angle?
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anon



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05 Feb 2011 02:42 AM
    Hi, I was wondering... I would like to calculate the spectral similarity existing between spectra that I have selected from different hyperspectral images in ENVI. How can I do this in ENVI? I am more interested in the shape of the spectra and not the magnitude of the values, so I believe spectral angle would be a good measure. However, I do not want to classify or map images with spectral angle mapper, only study the spectra and find out their spectral angles. Is it possible to do this in ENVI? Thanks!

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    07 Feb 2011 12:47 PM
    Yes, this would be useful, wouldn't it? Unfortunately, there is not currently a way to calculate the spectral angle between individual spectra in ENVI. You would have to put the spectra in an image and then apply a Spectral Angle classification (or put them in a spectral library, and then use Spectral Analyst to compare to other library spectra). - Peg
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