[GRASS-user] Sky-view Factor and LiDAR data strip adjustment

Adrian Kirilov kirilov.adrian at gmail.com
Thu May 16 08:51:44 PDT 2013

     Thank you for the answers,

     I tried already 'r.colors' module. It seems to work for me but maybe
have to set proper parameters. I'm not going to focus precisely on
"minimum-maximum stretch of the histogram with saturation", because now I
also don't know what does it mean exactly. I got it from a recently written
paper about DEM visualization techniques for archaeology.

     How to use 'i.landsat.rgb' with a GeoTiff image or DEM? It's necessary
to specify the channels red, green and blue. In my case the image is
composite. Should I use for example 'r.seg' add-on module to separate the
channels? Please, excuse me, but I'm really not familiar with image and
raster processing.

     It has appeared another problem in my project now. I received ALS
data, which is with overlapping strips in both directions, east-west and
north-south. Is it available some algorithm to do a strip adjustment in
GRASS GIS or any other software, so I can build cleared DEM (without
overlapping data)?


     Adrian Kirilov

On Thu, May 16, 2013 at 2:09 AM, Hamish <hamish_b at yahoo.com> wrote:

> 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!
> Nikos:
> > 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.
> Hamish
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