Re: [GRASS-user] accumulate a raster following the flow accumulation

2018-05-05 Thread Giuseppe Amatulli 
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 
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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Re: [GRASS-user] accumulate a raster following the flow accumulation

2018-05-05 Thread Micha Silver 

  
  
Hi:
There's an option to the r.univar module that takes a "zones"
raster, and calculates univariate statistics for each zone.
Statistics like mean, max, count, etc are calculated from the input
raster for each category in the zones file. The zones, in your case
would be basins from r.watershed, So you could do:

  r.univar map=temperature zones=basins output=temperature_stats

I'm not sure this is what you want, but it might get you started...

On 05/05/2018 09:51 PM, Giuseppe
  Amatulli 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/
  

  

  

  

  

  

  

  

  

  

  

  
  
  
  
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-- 
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
  

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[GRASS-user] accumulate a raster following the flow accumulation

2018-05-05 Thread Giuseppe Amatulli 
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/
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