[GRASS-user] r.forestfrag AddOn

GRASS GRASS user
1

Dear all,

I used the existing forest-fraction shell-script from manning
(http://osgeo-org.1560.n6.nabble.com/GRASSLIST-270-Fwd-Developing-a-forest-fragmentation-index-td3946212.html#a4366751),
reviewed/updated it a little bit and made some changes on the code,
particularly the calculation of pff and the indexing.

The script is based on the method from Riitters et al. (s.
http://www.consecol.org/vol4/iss2/art3).

I already posted the script on the GRASS-AddOns page:
http://grass.osgeo.org/grass-wiki/index.php?title=GRASS_AddOns&action=submit#r.forestfrag

However, the link to the script is temporary and I would like to put the
shell-script and html-description somewhere. So far, I could not find out
where to put it. Should it be here:
http://trac.osgeo.org/grass/browser/grass-addons/grass7/raster ? How would I
generate a new folder there?

By now, the script can only calculate the forest fraction for a 3x3 window.
Any ideas on how to automatically generate different window-sizes would be
welcome.

Stefan

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2

Hi Stefan,

On Sun, Feb 26, 2012 at 10:51 AM, Stefan Sylla <stefansylla@gmx.de> wrote:

Dear all,

I used the existing forest-fraction shell-script from manning
(http://osgeo-org.1560.n6.nabble.com/GRASSLIST-270-Fwd-Developing-a-forest-fragmentation-index-td3946212.html#a4366751),
reviewed/updated it a little bit and made some changes on the code,
particularly the calculation of pff and the indexing.

The script is based on the method from Riitters et al. (s.
http://www.consecol.org/vol4/iss2/art3).

I already posted the script on the GRASS-AddOns page:
http://grass.osgeo.org/grass-wiki/index.php?title=GRASS_AddOns&action=submit#r.forestfrag

However, the link to the script is temporary and I would like to put the
shell-script and html-description somewhere. So far, I could not find out
where to put it. Should it be here:
http://trac.osgeo.org/grass/browser/grass-addons/grass7/raster ? How would I
generate a new folder there?

You need to request for SVN write access for Addons, see the top
entry here:

http://grass.osgeo.org/wiki/Addons

Best,
Markus

By now, the script can only calculate the forest fraction for a 3x3 window.
Any ideas on how to automatically generate different window-sizes would be
welcome.

Stefan

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View this message in context: http://osgeo-org.1560.n6.nabble.com/r-forestfrag-AddOn-tp4508985p4508985.html
Sent from the Grass - Users mailing list archive at Nabble.com.
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3

Dear Stefan,

If i remember it right, the window size is an input to the r.neighbors command.
In the script there is an option to slect a windows size:

#%option
#% key: window
#% type: integer
#% description: window size default is 5
#% answer : 5
#% required : yes
#%END

You can modify the r.neighbors section like this:

r.neighbors input=A output=C method=sum size=$GIS_OPT_window --o
r.neighbors input=B output=D method=sum size= $GIS_OPT_window --o

On Sun, Feb 26, 2012 at 5:51 PM, Stefan Sylla <stefansylla@gmx.de> wrote:

By now, the script can only calculate the forest fraction for a 3x3 window.
Any ideas on how to automatically generate different window-sizes would be
welcome.

--
cheers,
maning
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