[GRASSLIST:92] Re: jumping moving window analysis

[Martin Wegmann]

hello, 

that sounds like the tool I was looking for.  

However I have no C skills therefore I either have to wait or look for a 
work-around. 

I thought about converting the gtopo30 to vector, extracting the centroid and 
moving it back to raster and using r.stats for querying the two DEMs. However 
r.to.vect fails in creating grids regardless of the actual value. Currently 
grid cells are grouped together, what usually makes sense. 
Now I am playing around with v.mkgrid, this might be another option for the 
first step. 

Further ideas are welcome, thanks so far for the replies, Martin

On Tuesday 14 March 2006 15:50, Markus Neteler wrote:
> Hi,
>
> here is a half-done v.cellstats. It's updated to the
> old/new GRASS 6 sites wrapper (bad approach!), compiles,
> but outputs nearly nothing as the G_put_sites() wrapper
> function doesn't write attributes.
>
> http://mpa.itc.it/markus/tmp/v.cellstats.tar.gz
>
> Someone may take it and updated to the GRASS 6 Vect_() API.
>
> Markus
>
> On Tue, Mar 14, 2006 at 10:43:49AM -0300, Carlos Guâno Grohmann wrote:
> > That's the kind of thing you could do with s.cellsats, back in
> > grass54. unfortunately, it has not been ported to grass6 yet...
> >
> > Carlos
> >
> > On 3/14/06, Martin Wegmann <wegmann at biozentrum.uni-wuerzburg.de> wrote:
> > > hello,
> > >
> > > I am stuck with a solution how to compute a kind of jumping moving
> > > window.
> > >
> > > We have a 1 Km DEM (gtopo30) and a 90 m DEM (SRTM) and would like to
> > > know how high the diversity of the srtm90 inside a gtopo30 pixel is.
> > > This could be achieved by a jumping moving window which is aligned to
> > > the gtopo30 but computes the diversity on the srtm90. The output would
> > > be a diversity map based on srtm90 but with a resolution of the
> > > gtopo30.
> > >
> > > r.le has an option called systematic continuous but writes the output
> > > into a file rather than creating a new map.
> > >
> > > r.neighbors is not a solution because it computes the diversity for
> > > each pixel continuous and not un-continuous like we wish.
> > >
> > > any solutions or ideas are welcome, regards, Martin
> > >
> > >
> > >
> > > --
> > > Martin Wegmann
> > >
> > > DLR - German Aerospace Center
> > > German Remote Sensing Data Center
> > > @
> > > Dept.of Geography
> > > Remote Sensing and Biodiversity Unit
> > > &&
> > > Dept. of Animal Ecology and Tropical Biology
> > > University of Wuerzburg
> > > Am Hubland
> > > 97074 Würzburg
> > >
> > > phone: +49-(0)931 - 888 4797
> > > mobile: +49-(0)175 2091725
> > > fax:   +49-(0)931 - 888 4961
> > > http://www.biota-africa.org
> > > http://www.biogis.de
> >
> > --
> > +-----------------------------------------------------------+
> >               Carlos Henrique Grohmann - Guano
> >   Geologist M.Sc  - Doctorate Student at IGc-USP - Brazil
> > Linux User #89721  - carlos dot grohmann at gmail dot com
> > +-----------------------------------------------------------+
> > _________________
> > "Good morning, doctors. I have taken the liberty of removing Windows
> > 95 from my hard drive."
> > --The winning entry in a "What were HAL's first words" contest judged
> > by 2001: A SPACE ODYSSEY creator Arthur C. Clarke

-- 
Martin Wegmann

DLR - German Aerospace Center
German Remote Sensing Data Center
@
Dept.of Geography
Remote Sensing and Biodiversity Unit
&&
Dept. of Animal Ecology and Tropical Biology
University of Wuerzburg
Am Hubland
97074 Würzburg

phone: +49-(0)931 - 888 4797
mobile: +49-(0)175 2091725
fax:   +49-(0)931 - 888 4961
http://www.biota-africa.org
http://www.biogis.de