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Last Post 25 Nov 2011 02:56 AM by  anon
Compute ROI separability
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anon



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25 Nov 2011 02:56 AM
    I am trying to compute ROI separability and sometimes I got an error message: "Singular value encountered in calculation for ROI: 060331_686E_E [Blue] 15 points" I am comparing 3 ROIs at a time and 060331_686E_E is one of the ROIs I am using. The results is a 0.00000 value for those cases where 060331_686E_E is involved. It looks like it is not a valid result, but a problem in calculation. Does anybody knows what the message means and what shall I do to solve the problem? Thank you very much Virginia

    MariM



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    28 Nov 2011 02:10 PM
    The 'singularity' error is similar to what is discussed in this tech tip because the separability measurement also performs a matrix inversion: http://www.exelisvis.com/...echtip.asp?ttid=3343 You might check the statistics of your input bands to be sure that there are no empty or duplicate bands, that your ROIs have variance, and that your ROIs have more points than the number of bands in the file.
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