Thank Johannes!!! right! I make some test and yes if you provide the flow=temp the output accumulation will be the accumulation of the temp weighted by the area of each cell.
So if i divide temp_accumulation / flowaccumulation i get the upper-stream mean temperature. Thank you very much Giuseppe On 5 May 2018 at 16:21, Johannes Radinger <johannesradin...@gmail.com> wrote: > Giuseppe, > you could use the "flow" option in r.watershed: flow=temperature > (result=accumulative temperature in drainage basin upstream). And then you > could calculate another run of r.watershed with a flow map with values =1 > (result = accumulative drainage basin upstream, cell count). Dividing both > maps provides a map of average temperature upstream. > > HTH > J > > On Sat, May 5, 2018 at 8:51 PM, Giuseppe Amatulli < > giuseppe.amatu...@gmail.com> wrote: > >> Hi, >> I'm searching for a GRASS command that is able to "accumulate" a raster >> following the flow accumulation output obtained by r.watershed. >> >> In other words if I have a temperature raster I would like to >> accumulate the temperature values following the drainage direction. The >> final results would to get the mean of the uppers stream temperature (so >> accumulation_temperature / flowaccumulation). >> >> r.accumulation input=temperature flowaccumulation=flow accumulation >> output=acc_temperature >> >> It is something that exist? >> >> Thank you >> Giuseppe >> >> >> -- >> 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.net >> Work: https://environment.yale.edu/profile/giuseppe-amatulli/ >> >> _______________________________________________ >> grass-user mailing list >> grass-user@lists.osgeo.org >> 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.net Work: https://environment.yale.edu/profile/giuseppe-amatulli/
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