[GRASS-user] r.clump with diagonal cells

[Eric Goddard]

Hi Johannes,

There is an add on module called r.clump4p available at at
http://sil.uc.edu/downloads.html#software

It has an option to clump diagonal cells. It is also parallelized and
completes much faster than r.clump.

Eric
 On Jan 13, 2014 5:39 AM, "Johannes Radinger" <johannesradinger at gmail.com>
wrote:

> Dear all,
>
> I just tried r.clump on a rastarized river with alternating patches of good
> and bad habitat (values 1 and 2). However, due to its linear structure,
> many
> cells of the same habitat patch are often only diagonally connected. So
> this
> is a case where r.clump does not work (as stated in its manual).
>
> So, as a suggestion, it'd be nice if also diagonal cells could be
> considered by r.clump (e.g. by setting a flag).
>
> ...or maybe someone of you has another idea to how to get unique values
> for each discrete patch (also diagonally connected cells of homogeneous
> habitat quality).
>
> FYI r.clump has been tested on GRASS7.
>
> best regards,
> Johannes
>
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