[GRASS-stats] Re: [GRASS-user] Testing i.pca ~ prcomp(),
m.eigensystem ~ princomp()
nikos.alexandris at felis.uni-freiburg.de
Tue Mar 31 11:14:18 EDT 2009
On Tue, 2009-03-31 at 17:13 +0200, Markus Neteler wrote:
> On Tue, Mar 31, 2009 at 5:00 PM, Markus Metz
> <markus.metz.giswork at googlemail.com> wrote:
> > Nikos Alexandris wrote:
> >> Using MODIS (range varries between bands, up to max. ~5500):
> > Sure? Valid range: -100 - 16000 for MODIS e.g. Surface Reflectance 8-Day L3
> > Global 500m.
> Remember that you have to rescale these data first:
> -> MOD09Q1 Terra Surface Reflectance Bands 1–2 Tile 250m 8 Day
> -> layers
> ... MULTIPLY BY SCALE FACTOR ...
Yep, I know that. But why is it wrong to just use them as they are?
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