[GRASS-user] r.flow function

[Helmut Kudrnovsky]

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
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