[GRASS-user] [GRASSLIST:270] Fwd: Developing a forest fragmentation index

[Paulo van Breugel]

Hi Anusheema

As I replied on your question on my blogpost, there are two versions of the
script; one for GRASS 6  and one for GRASS 7. In both cases you need to
install the script manually (I am planning to rewrite the script as a
python script, but that will take some time).

The script for GRASS 7 did indeed not work anymore for me due to syntax
changes in some of the functions used. An updated version should be
available on
http://trac.osgeo.org/grass/browser/grass-addons/grass7/raster/r.forestfrag.
If you try out and it doesn't work, let me know (and if so, please indicate
whether you are running this on Linux or Windows).

Paulo


On Sat, Dec 27, 2014 at 2:38 PM, Markus Neteler <neteler at osgeo.org> wrote:

> On Sat, Dec 27, 2014 at 12:53 PM, anusheema <anusheema at gmail.com> wrote:
> > Dear list members,
> >
> > I am also interested in implementing Dr. Kurt Ritters forest
> fragmentation
> > model. I was, however, attempting this in R Statistical software,
> although I
> > am pretty new to both R and GRASS.
>
> Which GRASS version do you use?
>
> > While reading forums on this model, I came across this post. I see that
> Mr.
> > Maning Sambale and Mr. Stefan Sylla have developed an AddOn for GRASS:
> > r.forestfrag (http://grasswiki.osgeo.org/wiki/GRASS_AddOns#r.forestfrag
> ).
> > But while trying to attempt this model on GRASS, it keeps showing an
> error
> > (AddOn not found).
>
> If you are using GRASS 6: the script has been written for GRASS 7. You
> can install both 6 and 7 in parallel on the same computer. However, I
> see a link to a GRASS 6 version of the script in the Wiki page.
>
> If you are using GRASS 7: The reason is that it has not been
> implemented as Python script but as Shell script. To my knowledge
> g.extention (the extension manager) is not capable to deal with shell
> scripts.
>
> > If you could please share the script? I was trying to implement the
> script
> > mentioned in this post, but without much luck. In R, with the help of
> this
> > script, replicating Pf is easier, however, for Pff, implementing the
> code in
> > cardinal direction only, is more complex.
>
> You can simply download the script from here:
>
> http://trac.osgeo.org/grass/browser/grass-addons/grass7/raster/r.forestfrag/r.forestfrag?format=txt
> and put it into the search path in your GRASS session. Be sure to set
> the "executable" flag.
>
> Please let us know how it goes.
>
> Markus
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