enumerate grid clusters/patches with size of contiguous cluster

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

Agus

Andrew Niccolai escribi?:
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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_______________________________________________
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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

enumerate grid clusters/patches with size of contiguous cluster

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