[GRASS-user] Sky-view Factor and GeoTiff Histogram equalization (stretch)

Nikos Alexandris nik at nikosalexandris.net
Mon May 20 04:26:50 PDT 2013

Adrian wrote:
> > > I have to do *minimum-maximum stretch of the histogram with
> > > saturation of minimum*. How to do this in GRASS? Any help
> > > will be highly appreciated!
> > I don't know what the "...with a saturation of minimum"
> > means.  Maybe someone else that understands this stuff better
> > can help.

> the "stretch" sounds a bit like linear 0.0-1.0 normalization to me.
> for an application, see also the i.landsat.rgb module.

Also, there is "r.rescale.eq". Maybe also of interest here? @Adrian, 
r.rescale.eq will operate on the actual pixel values and create a new raster 
map as requested, e.g.:

r.rescale.eq input=InputMap output=RescaledMap to=0.0,1.0

Best, Nikos

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