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Last Post 01 Mar 2013 07:31 AM by  anon
Spectral Math
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anon



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01 Mar 2013 07:31 AM
    Hello, I have hiperspectral image (72b). Image have cloud shadows, some regions have lover intensity. I imagine that i could equalize it by every image pixel divide by every pixel mean value. Could i perform it in spectral math? My expression what i wrote is s1/mean(s1), for s1 i use the Map Variable to input file and select image. The result not satisfied me. So, i think i dont understand spectral math tool so well.

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    01 Mar 2013 07:57 AM
    You may want to consider something like ENVI's IAR Reflectance tool, which normalizes an image to a scene average spectrum. - Peg Exelis VIS

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    01 Mar 2013 12:03 PM
    What do you mean by the result wasn't satisfactory? What kind of hyperspectral imagery are you working with?

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    03 Mar 2013 03:02 AM
    I have CASI 72 band image. By the result wasn't satisfactory i mean image not looks like i want. Almost it equalized, but one region in the image bottom witch were previous in dark side become very bright. I want to play with VegIndices, maybe separate tree species. This bright region interfere me and i can't cut it out i need to classify it to. I tried before IAR Reflectance tool it not helped. Maybe you can suggest some references about removing cloud shadows from image or some image normalizations.
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