[GRASS-dev] PCA question

[Hamish]

Nikos wrote:
> Which resolution is to be enhanced?  The geometric?  Is it meant
> to keep PC1 and mix it with the rest, or keep the Pan and throw
> away PC1?
> 
> Principal Component 1 will contain the highest variance of
> your input data -- which, in fact, is a composition of different
> amount of information originated from all input bands. If you
> throw that away you are left with a dataset which is likely to
> be useless!

(not talking about pan-sharpening, but in general,)
how about the situation where you have a map data which is
loudly dominated by a signal, and you want to try and remove
that loud signal so that you can look at the subtle variations
caused by a different source that the loud signal had been
masking?

is removing PC1 then back-inverting a suitable method for that
sort of task? or is there another more suitable method?


thanks,
Hamish