Thanks Nikos and Mortiz, >From GRASS Wiki what I got is I need more details of step.6 in the Background section i.e *project original dataset signals* (PC's or PC scores: eigenvector * input-data) to get
projecting the dataset is based on the text output of i.pca eigen values and input data. I guess there must be a simple transformation equation that can be applied to every pixel in the input data to get the raster output of i.pca. Nikos, Your thesis is a long read and I only need a very small part from it. If you could tell me those( I strongly believe you can ) then it will be great. I need to start coding after this and this is only a small part of it. my actual work is pure pixel identification for spectral unmixing On Thu, Feb 7, 2013 at 5:43 AM, Nikos Alexandris <[email protected]>wrote: > Rashad M wrote: > > > > Hi All, > > > > i.pca outputs raster bands and the pixel values are transformed > > > obivously. But anyone can tell me how the transformation works > > > > if a pixel P1 has value X after i.pca it will be Y > > > > Is there any specific math equation that is applied to every pixel by > PCA? > > Moritz Lennert wrote: > > > http://en.wikipedia.org/wiki/Principal_component_analysis > > and > > http://grasswiki.osgeo.org/wiki/Principal_Component_Analysis > > Ehm, right -- I've overlooked your post Moritz, apologies. > > Nikos > _______________________________________________ > grass-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-dev > -- Regards, Rashad
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