hello,
I tried to remove islands in a classified raster image which are smaller than
1 -2 pixel.
Is there any command which removes small islands and assigns the prevailing
value of the surrounding area to this island?
r.neighbors might be what I want if there would a method=dominant/prevailing
value, method=average just smoothed the image.
any ideas? thanks in advance, Martin
r.neighbors method=mode
Em Sáb 20 Nov 2004 13:00, Martin Wegmann escreveu:
hello,
I tried to remove islands in a classified raster image which are smaller
than 1 -2 pixel.Is there any command which removes small islands and assigns the prevailing
value of the surrounding area to this island?r.neighbors might be what I want if there would a
method=dominant/prevailing value, method=average just smoothed the image.any ideas? thanks in advance, Martin
--
Instituto IGARÉ
http://geocities.yahoo.com.br/institutoigare
e-mail: institutoigare@yahoo.com.br
For higher precision, you may use:
GRASS 5.7:
- r.to.vect
- v.clean
rmarea - remove small areas, the longest boundary with adjacent area is removed
Markus
On Sat, Nov 20, 2004 at 01:45:39PM -0200, Sandro Klippel wrote:
r.neighbors method=mode
Em Sáb 20 Nov 2004 13:00, Martin Wegmann escreveu:
> hello,
>
> I tried to remove islands in a classified raster image which are smaller
> than 1 -2 pixel.
>
> Is there any command which removes small islands and assigns the prevailing
> value of the surrounding area to this island?
>
> r.neighbors might be what I want if there would a
> method=dominant/prevailing value, method=average just smoothed the image.
>
> any ideas? thanks in advance, Martin--
Instituto IGARÉ
http://geocities.yahoo.com.br/institutoigare
e-mail: institutoigare@yahoo.com.br
--
Markus Neteler <neteler itc it> http://mpa.itc.it
ITC-irst - Centro per la Ricerca Scientifica e Tecnologica
MPBA - Predictive Models for Biol. & Environ. Data Analysis
Via Sommarive, 18 - 38050 Povo (Trento), Italy