Hi Milton thanks for your help
I want to compute a lot of things.. :) for instance, I want to look at the large scale (regional, non-local) behavior of slope and aspect, but since aspect is a circular variable, I can't just go around with mean/median/etc, which are the tools I have on GIS, so I was hoping I could find some way to define the moving-window and the apply some function (from a package or user-defined) to the values within the window (like circular statistics). best regards Carlos (Brazil / UK) On 7/1/07, Milton Cezar Ribeiro <[EMAIL PROTECTED]> wrote: > > Hi Carlos, > > What are really you looking for? What you want to compute for the central > pixel? > I use FRAGSTATS to compute some landscape metrics using moving windows. > There you can define circular and rectangular shaped search windows, sized > as you want. > > Kind regards, > > Miltinho > Brazil > > > ----- Mensagem original ---- > De: "Carlos "Guâno" Grohmann" <[EMAIL PROTECTED]> > Para: [email protected] > Enviadas: Quarta-feira, 27 de Junho de 2007 12:27:28 > Assunto: [R] moving-window (neighborhood) analysis > > > Hello all > > I was wondering what would be the best way to do a moving-window > analysis of a matrix? By moving-window I mean that kind of analysis > common in GIS, where each pixel (matrix element) of the resulting map > is a function of it neighbors, and the neighborhood is a square > matrix. > I was hoping there was some function in R that could do that, where I > could define the size of the neighborhood, and then apply some > function to the values, some function I don't have in GIS packages > (like circular statistics). > > thanks all. > > Carlos > > > -- > +-----------------------------------------------------------+ > 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 > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > > ________________________________ > Novo Yahoo! Cadê? - Experimente uma nova busca. -- +-----------------------------------------------------------+ 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 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
