[GRASS-user] Re: [GRASS-dev] i.pca

[Michael Barton]

Brad,

I had a chance to try this out tonight. It works very well. It seems to go
quite fast too. Here is a nice result of a PCA of a Terra ASTER bands 1-9
(VNIR and SWIR) for part of the Phoenix metro area. I used d.his to show PCA
bands 1-3. The Salt River Indian Reservation agricultural fields really
stand out as do some of the mountain park areas.

<http://www.public.asu.edu/~cmbarton/files/temp/phoenix_aster1-9_pca.jpg>

Michael

On 2/20/07 7:41 AM, "Michael Barton" <michael.barton at asu.edu> wrote:

> Thanks Brad. I hope to try it out if I have time to recompile this week.
> 
> Michael
> 
> 
> On 2/19/07 3:59 PM, "Brad Douglas" <rez at touchofmadness.com> wrote:
> 
>> Hello,
>> 
>> I just committed a rewritten i.pca module.  It now supports NULL cells
>> without skewing the data and will work properly with float/double maps.
>> It's a bit slower than the original, but that's the price we pay for
>> modules that work. :-)
>> 
>> My testing has proved good results, but I'd like to have others test.
>> 
> 
> __________________________________________
> Michael Barton, Professor of Anthropology
> School of Human Evolution & Social Change
> Center for Social Dynamics & Complexity
> Arizona State University
> 
> phone: 480-965-6213
> fax: 480-965-7671
> www: http://www.public.asu.edu/~cmbarton
> 

__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton