Hi Giuseppe, Not a single command, but you could:
1. run r.grow.distance, then 2. r.neighbors with 5 pixels circular neighborhood and maximum statistics 3. r.mapcalc expression=”result=max_nbh_5<=1,1,null()” If you want to get a vector lines result you might need r.thin and v.to.rast after that. Hope that helps! Cheers Stefan From: grass-user [mailto:[email protected]] On Behalf Of Giuseppe Amatulli Sent: torsdag 20. april 2017 18.06 To: GRASS user list <[email protected]> Subject: [GRASS-user] select only patches with 1-cell width Hi, I have a huge streams/lakes dataset and I want to be able to select only water bodies (streams) with 1-cell width. In other words if i have this raster [Inline images 1] I want to select only this streams [Inline images 2] Any suggestion or grass command that does such operation. Thank you Best -- Giuseppe Amatulli, Ph.D. Research scientist at Yale School of Forestry & Environmental Studies Yale Center for Research Computing Center for Science and Social Science Information New Haven, 06511 Teaching: http://spatial-ecology.org Work: https://environment.yale.edu/profile/giuseppe-amatulli/
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