[GRASS-dev] PCA question

[Michael Barton]

Fortunately, those are not issues for pan sharpening.

Michael

On Jun 25, 2012, at 4:23 PM, Hamish wrote:

> Hi,
> 
> FWIW, it's a known feature that GRASS's i.pca and R's version
> give transposed output. It's just cosmetic and the row and column
> headers tell you what's what. GRASS lists the principal
> components row-wise, R presents them column-wise.
> 
> See discussion and GRASS vs. R testing/validation w/Nikos from
> c. March 2009. (& trac ticket #430)
> 
> 
> See also other open i.pca tickets:
>  "i.pca fails to center data prior to analysis"
>  http://trac.osgeo.org/grass/ticket/576
> 
>  "i.pca: close map before writing out metadata?"
>  http://trac.osgeo.org/grass/ticket/511
> 
>  "i.pca metadata truncated"
>  http://trac.osgeo.org/grass/ticket/1279
> 
> 
> Hamish

_____________________
C. Michael Barton
Visiting Scientist, Integrated Science Program
National Center for Atmospheric Research &
University Corporation for Atmospheric Research
303-497-2889 (voice)

Director, Center for Social Dynamics & Complexity 
Professor of Anthropology, School of Human Evolution & Social Change
Arizona State University
www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu