[GRASS-user] Re: [GRASS-dev] i.pca
rez at touchofmadness.com
Fri Feb 23 23:11:48 EST 2007
On Fri, 2007-02-23 at 11:20 -0800, Dylan Beaudette wrote:
> On Monday 19 February 2007 14:59, Brad Douglas 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.
> Hi Brad,
> I just tried it out with some ikonos imagery (r,g,b bands only...) with good
> results. The various vegetation communities standout, along with the rock
> outcroppings (bright pink) ! I have previously been using NDVI for the rock
> outcrops, but it looks like this approach might work better. Good
> performance, total time for 13838448 cells was about 1 minute on a 3ghz xeon.
Thank you guys for doing a little testing for me!
Brad Douglas <rez touchofmadness com> KB8UYR/6
Address: 37.493,-121.924 / WGS84 National Map Corps #TNMC-3785
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