[GRASS-user] A question before I embark on a programming exercise

[Rainer M Krug]

Thomas Adams <tea3rd at gmail.com> writes:

> All:
>
> I need to generate an ascii text file from a flow direction grid that
> consists of (among a couple other things that don't really matter at this
> point) for each pixel:
>
> (1) a unique integer identifier (1 -- N) for the pixel
> (2) the integer identifier of the downstream pixel (assuming there is ONLY
> one)
> (3) the x,y location of the pixel (presumably, the lower left corner of the
> pixel)
>
> has anyone already done something like this?

Well - I have done something similar, i.e. simulated water dispersal, in
a package which is at [1]. The actual function is at [1]. After reading
your mail again, it seems to be different, but it still might give you
some ideas.

Cheers,

Rainer

>
> It's needed (along with some header information) as an input file for a
> gridded distributed hydrologic model, identifying the flow connectivity
> from pixel to pixel for streamflow routing purposes. I have already
> formulated conceptually how to do this, but if someone has already done
> such a thing, why reinvent the wheel??
>
> Any help is appreciated.
>
> Regards,
> Tom
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Footnotes: 
[1] https://github.com/rkrug/seedDisp 

[1]  https://github.com/rkrug/seedDisp/blob/master/R/waterDispGRASS.R

-- 
Rainer M. Krug
email: Rainer<at>krugs<dot>de
PGP: 0x0F52F982
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