[GRASS-user] upslope contributing areas

[Francesco Mirabella]

Many thnaks to all,
I 'll try and see what I get

cheers
Francesco


Markus Metz wrote:
> On Thu, Oct 13, 2011 at 9:41 AM, Rainer M Krug <r.m.krug at gmail.com> wrote:
>>
>> On Thu, Oct 13, 2011 at 9:04 AM, Francesco Mirabella <mirabell at unipg.it>
>> wrote:
>>> Hello,
>>> and thanks for your fast replies,
>>> yes, the final result which I'd like to get is a river profile along which
>>> the values of the upslope contributing areas can be plotted on a separate y
>>> axis.
>>> In order to get this I suppose I should be able to "cat
>>> river_long_profile_ascii | r.profile a_raster_map_containing_the
>>> upslope_areas" which can provide values in square meters or square km or
>>> whatever.
>>> Do you know if such a raster map can be obtained from a dem?
>> Possibly r.flow could help here - in the manual:
>>
>> ################
>> There are three possible output maps which can be produced in any
>> combination simultaneously: a vector map flout of flowlines, a raster map
>> lgout of flowpath lengths, and a raster map dsout of flowline densities
>> (which are equal upslope contributed areas per unit width, when multiplied
>> by resolution).
>> ################
>>
> 
> Another possibility to get total upslope contributing area for each
> cell is the flow accumulation output of r.watershed and r.terraflow.
> 
> Upslope contributing areas for arbitrary points can be determined with
> r.stream.basins, or one point after another with r.water.outlet. These
> modules use drainage direction produced by r.watershed as input.
> 
> HTH,
> 
> Markus M
> 
>>>
>>> Rainer M Krug wrote:
>>>> It depends on what the OP was looking for - it sounds to me that he is
>>>> looking for a kind of "dynamic" approach, where one can determine the
>>>> upslope drainage area for an arbitrary location. Unfortunately, I don't have
>>>> a solution, but would be quite interested in the answer.
>>>>
>>>> Cheers,
>>>>
>>>> Rainer
>>>>
>>>> On Thu, Oct 13, 2011 at 8:36 AM, Johannes Radinger <jradinger at gmx.at
>>>> <mailto:jradinger at gmx.at>> wrote:
>>>>
>>>>    Hello Francesco,
>>>>
>>>>    you could use something like the AddOn r.stream.basin
>>>>    (http://grass.osgeo.org/wiki/R.stream.*)
>>>>    to delineate the basins. Every basin gets a unique number.
>>>>    Afterwards you can just query how
>>>>    many cells do have a certain number.
>>>>
>>>>    best regards!
>>>>    Am 13.10.2011 <tel:13.10.2011> um 08:20 schrieb Francesco Mirabella:
>>>>
>>>>     > Hi list,
>>>>     > does anyone know if there is a way to compute the upslope
>>>>    drainage contributing areas along a stream?
>>>>     >
>>>>     > thanks for your help!
>>>>     > Francesco
>>>>     >
>>>>     >
>>>>     >
>>>>     >
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>>>>
>>>>
>>>>
>>>> --
>>>> Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
>>>> Biology, UCT), Dipl. Phys. (Germany)
>>>>
>>>> Centre of Excellence for Invasion Biology
>>>> Stellenbosch University
>>>> South Africa
>>>>
>>>> Tel :       +33 - (0)9 53 10 27 44
>>>> Cell:       +33 - (0)6 85 62 59 98
>>>> Fax (F):       +33 - (0)9 58 10 27 44
>>>>
>>>> Fax (D):    +49 - (0)3 21 21 25 22 44
>>>>
>>>> email:      Rainer at krugs.de <mailto:Rainer at krugs.de>
>>>>
>>>> Skype:      RMkrug
>>>>
>>
>>
>> --
>> Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology,
>> UCT), Dipl. Phys. (Germany)
>>
>> Centre of Excellence for Invasion Biology
>> Stellenbosch University
>> South Africa
>>
>> Tel :       +33 - (0)9 53 10 27 44
>> Cell:       +33 - (0)6 85 62 59 98
>> Fax (F):       +33 - (0)9 58 10 27 44
>>
>> Fax (D):    +49 - (0)3 21 21 25 22 44
>>
>> email:      Rainer at krugs.de
>>
>> Skype:      RMkrug
>>
>>
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