[GRASS-user] r.flow function

[Valter Albino]

OOps,
One example was wrong (this other for example: =MÁXIMO(1,35/50,250/50)=5.00)
Cumprimentos,
*Valter Albino -* Geógrafo Físico, M.Sc.
Modelação H&H / Riscos ambientais / OT&U
www.valteralbino.wixsite.com/hydrodynamics


Valter Albino <valteralbino  gmail.com> escreveu no dia segunda, 3/02/2020
à(s) 19:46:

> Good evening Helmut,
>
> Thank you for reply (nice try, expert :-) ).
> Don't understand the presence of 1, he is absent in the formula. Neither
> the choice of number 50.
> So, in a spreadsheet is something like the following example:
> =MÁXIMO(1,150/50,338/50)=6.76
> If using 10:
> =MÁXIMO(1,150/10,338/10)=33.80
>
> Regards
>
> Cumprimentos,
> *Valter Albino -* Geógrafo Físico, M.Sc.
> Modelação H&H / Riscos ambientais / OT&U
> www.valteralbino.wixsite.com/hydrodynamics
>
>
> Helmut Kudrnovsky <hellik  web.de> escreveu no dia segunda, 3/02/2020 à(s)
> 18:09:
>
>> Valter Albino wrote
>> > Good afternoon
>> >
>> > From the function "r.flow" (
>> > https://grass.osgeo.org/grass78/manuals/r.flow.html), can some expert
>> > explain me what is the meaning of: "val-th" and the meaning of: "max(1,
>> > <rows
>> > in elevation>
>> > /50,
>> > <cols in elevation>
>> > /50)."
>>
>> no expert here on my side, though, from the manual:
>>
>> skip=integer
>>     Number of cells between flowlines
>>
>> Another option, skip, indicates that only the flowlines from every val-th
>> cell are to be included in flowline.
>>
>> => it may be something like: val-th value is the threshold value given by
>> skip
>>
>> The default skip is max(1, <rows in elevation>/50, <cols in elevation>/50)
>>
>> => it's the calculation of the default skip value if no skip=integer
>> figure
>> is given.
>>
>> see the r.mapcalc manual:
>> https://grass.osgeo.org/grass78/manuals/r.mapcalc.html
>>
>> max(x,y[,z...])         largest value of those listed
>>
>> contribution for precising the manual welcome.
>>
>>
>>
>>
>>
>>
>> -----
>> best regards
>> Helmut
>> --
>> Sent from: http://osgeo-org.1560.x6.nabble.com/Grass-Users-f3884509.html
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>
>
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