[STATSGRASS] moving-window analysis

[Edzer J. Pebesma]

Well, package gstat provides linear regression within a local search 
neighbourhood defined either by distance (circular window) or by nr of 
nearest neighbours. Is that what you want?

try:

library(gstat)
data(meuse)
data(meuse.grid)
coordinates(meuse)=~x+y
gridded(meuse.grid) = ~x+y
x = krige(log(zinc)~sqrt(dist),meuse,meuse.grid,maxdist=600)
image(x)
--
Edzer

Carlos "Guâno" Grohmann wrote:
> Basic moving-window (ie, mean, stddev etc) is easy. The tricky
> question is how to make a best-fit least squares inside that moving
> window? I mean that it has to be a general function, so you can choose
> the size of the window.
>
> Carlos
>
>
>
> On 6/6/07, G. Allegri <giohappy at gmail.com> wrote:
>> In my experience the easier way to realize a moving-window analysys
>> between rasters is to use r.mapcalc. I never did it in R. I knew that
>> caTools package could do it someway... but I think using r.mapcla is
>> more straightforward.
>> Look at this nice article:
>> http://casoilresource.lawr.ucdavis.edu/drupal/node/221
>> -- 
>> Giovanni
>>
>> 2007/6/6, Carlos Guâno Grohmann <carlos.grohmann at gmail.com>:
>> > > What kind of data do you have?
>> >
>> > DEMs, some LiDAR, maybe
>> >
>> >
>> >
>> >
>> > > 2007/6/6, Carlos Guâno Grohmann <carlos.grohmann at gmail.com>:
>> > > > Hello. I was thinking what would be the best way to do a 
>> moving-window
>> > > > analysis where the result is the deviation of values about a 
>> best-fit
>> > > > plane?
>> > > >
>> > > > some modification to r.in.xyz?
>> > > > r.mapcalc?
>> > > > R? (which package, function..?)
>> > > >
>> > > > thanks
>> > > >
>> > > >
>> > > >
>> > > > --
>> > > > +-----------------------------------------------------------+
>> > > >               Carlos Henrique Grohmann - Guano
>> > > >   Visiting Researcher at Kingston University London - UK
>> > > >   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
>> > > >
>> > > > _______________________________________________
>> > > > statsgrass mailing list
>> > > > statsgrass at grass.itc.it
>> > > > http://grass.itc.it/mailman/listinfo/statsgrass
>> > > >
>> > >
>> >
>> >
>> > --
>> > +-----------------------------------------------------------+
>> >               Carlos Henrique Grohmann - Guano
>> >   Visiting Researcher at Kingston University London - UK
>> >   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
>> >
>> > _______________________________________________
>> > statsgrass mailing list
>> > statsgrass at grass.itc.it
>> > http://grass.itc.it/mailman/listinfo/statsgrass
>> >
>>
>
>