Thanks Pedro, yes I had already tried, but i do not get really what I want. Moreover, the delineation of watersheds is based on a predefined threshold that can be quite arbitrary give really different results.
Best Giuseppe On 18 January 2017 at 14:27, Pedro Venâncio <[email protected]> wrote: > Hi Giuseppe, > > Maybe you can use r.watershed [0] to get the "basins". > > Best regards, > Pedro Venâncio > > [0] https://grass.osgeo.org/grass72/manuals/r.watershed.html > > 2017-01-18 19:16 GMT+00:00 Giuseppe Amatulli <[email protected]> > : > >> Hi all, >> >> >> >> I would like to "segment" an image using a sort of Voronoi >> <https://urldefense.proofpoint.com/v2/url?u=https-3A__en.wikipedia.org_wiki_Voronoi-5Fdiagram&d=CwMFaQ&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=WXcS58IfKIlNshJRe1p51UO4aV2lTPDP2KeAvExEWkM&m=-q05ggwZ7xB31XO6ZJhmFYht4GKQ2nmFojS6li_t2As&s=Cqh6IsnZ5-oxcE2yVMRceyhb4KwTB2q3ihdDv8E4GWg&e=> >> algorithm >> on a cost surface instead of distance between point. >> >> >> >> Below you can see an image where the black pixels identity areas with >> high cost value. I would like to identify the "valley" between theses black >> areas. >> >> >> >> In the second image I draft by hand an ideal solution for few high cost >> areas. >> >> >> >> Which grass command can do this kind of delineation? >> >> >> >> Thanks, >> >> >> Giuseppe >> >> >> [image: Inline images 1] >> >> [image: Inline images 2] >> >> -- >> 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 >> <https://urldefense.proofpoint.com/v2/url?u=http-3A__spatial-2Decology.org&d=CwMFaQ&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=WXcS58IfKIlNshJRe1p51UO4aV2lTPDP2KeAvExEWkM&m=-q05ggwZ7xB31XO6ZJhmFYht4GKQ2nmFojS6li_t2As&s=2WUybjpe6r7Te9PU70VIWSGVIuSPRvgtrQM-Ej6RBuY&e=> >> Work: https://environment.yale.edu/profile/giuseppe-amatulli/ >> >> >> >> >> _______________________________________________ >> grass-user mailing list >> [email protected] >> https://lists.osgeo.org/mailman/listinfo/grass-user >> > > -- 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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