[R-sig-Geo] enumerate grid clusters/patches with size of contiguous cluster

[Agustin Lobo]

and a combination of r.clump and r.stats
in grass (which is "linked" to R) can also do the job.

Agus

Andrew Niccolai escribió:
> If you aren't dedicated to an R specific solution, ImageJ is open source and
> does this under Analysis/Binary.
> 
> -----Original Message-----
> From: r-sig-geo-bounces at stat.math.ethz.ch
> [mailto:r-sig-geo-bounces at stat.math.ethz.ch] On Behalf Of Murray Richardson
> Sent: Wednesday, March 12, 2008 12:59 PM
> To: r-sig-geo at stat.math.ethz.ch
> Subject: [R-sig-Geo] enumerate grid clusters/patches with size of contiguous
> cluster
> 
> Hello friends,
> 
> I am trying to take a binary input grid of patches (connected cells with 
> value = 1), and assign to each non-zero cell the total number of pixels 
> comprising the patch to which it belongs. 
> 
> So for a connected patch of 27 pixels, all cells belonging to that patch 
> will have a value of 27.
> 
> Just wondering if anyone has any suggestions.  Maybe a function I don't 
> know about yet...
> 
> Thanks in advance,
> 
> Murray Richardson
> 
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-- 
Dr. Agustin Lobo
Institut de Ciencies de la Terra "Jaume Almera" (CSIC)
LLuis Sole Sabaris s/n
08028 Barcelona
Spain
Tel. 34 934095410
Fax. 34 934110012
email: Agustin.Lobo at ija.csic.es
http://www.ija.csic.es/gt/obster