[GRASS-user] Re: Error while running i.gensig- Signature 1 not positive definite

[Kim Besson]

Hi

My group images ranges between 0-255, my training_areas are more than OK (I
guess).
WHy am I getting "Signature 1 not positive definite"?  What shall I do to
avoid this error?
Thanks
Kim

2011/2/14 Kim Besson <kimbesson1981 at gmail.com>

> Greetings
>
> I have a training area map and a few landsaty images, and everytime i try
> to generate a signature I get this error/warning:
> Signature 1 not positive definite
>
> What might be causing this? can this be a problem of my dataset? (must it
> range in some interval of values or what is wrong with it)?
> How can I avoid this?
> And what does it mean Not positive definite?
> Thanks
> Kim Besson
>
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