[GRASS-user] r.flow function

[Valter Albino]

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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