[GRASS-user] r.clump with diagonal cells

Markus Metz markus.metz.giswork at gmail.com
Sat Feb 22 05:36:53 PST 2014

On Mon, Jan 13, 2014 at 12:39 PM, 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).

Done in r59122. Diagonal cells are also considered with the new -d
flag. BTW, r.clump seems pretty fast to me, 200 million cells are
clumped in 10 seconds.

Markus M

> ...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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