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<p>Some further python specific tips that might help.</p>
<p><br>
</p>
<p>To get a list of rasters that match some pattern (say you have
many rasters like "band1", "band2",...), then run v.rast.stats on
each of them in a loop to get zonal stats in the vector "buffers":<br>
</p>
<p><br>
</p>
<p><font size="+1"><tt># This must be run from within a grass
session</tt><tt><br>
</tt></font></p>
<p><font size="+1"><tt>import grass.script as gscript</tt></font></p>
<p><font size="+1"><tt>rast_list = gscript.read_command("g.list",
type = "rast", pattern = "band*").strip().split("\n")</tt></font></p>
<p><font size="+1"><tt># Loop thru the rasters, run v.rast.stats,
and specify the column prefix using the raster name.</tt></font></p>
<p><font size="+1"><tt>methods = ("minimum", "maximum", "average",
"sum") # add whatever stats you need</tt><tt><br>
</tt></font></p>
<p><font size="+1"><tt>for r in rast_list:</tt><tt><br>
</tt></font></p>
<p><font size="+1"><tt> gscript.run_command("v.rast.stats", </tt></font></p>
<p><font size="+1"><tt> map_ = "buffers", raster=r,
column_prefix=r, method=methods)</tt></font></p>
<p><br>
</p>
<p><br>
</p>
<p>Be aware that if you have many rasters, you'll end up with
many,many columns in the "buffers" vector<br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 10/29/18 9:54 PM, Stefan Blumentrath
wrote:<br>
</div>
<blockquote type="cite"
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi
Alessandro,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB">You could try v.rast.bufferstats [1], if you do
not have hundrets of thousands of points….<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB">If the buffers don`t overlap, you could use
v.rast.stats [2] from the upcoming GRASS 7.6 release, that
will allow multiple raster input…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB">Otherwise have a look at the general
introduction to GRASS and Python [3].<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB">Stefan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB">1: <a
href="https://grass.osgeo.org/grass74/manuals/addons/v.rast.bufferstats.html"
moz-do-not-send="true">
https://grass.osgeo.org/grass74/manuals/addons/v.rast.bufferstats.html</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB">2: <a
href="https://grass.osgeo.org/grass76/manuals/v.rast.stats.html"
moz-do-not-send="true">
https://grass.osgeo.org/grass76/manuals/v.rast.stats.html</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB">3: <a
href="https://grasswiki.osgeo.org/wiki/GRASS_and_Python"
moz-do-not-send="true">
https://grasswiki.osgeo.org/wiki/GRASS_and_Python</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span
lang="EN-US"> grass-user
<a class="moz-txt-link-rfc2396E" href="mailto:grass-user-bounces@lists.osgeo.org"><grass-user-bounces@lists.osgeo.org></a>
<b>On Behalf Of </b>Alessandro Sebastiani<br>
<b>Sent:</b> mandag 29. oktober 2018 16:06<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a><br>
<b>Subject:</b> [GRASS-user] zonal statistics for multiple
areas<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal">Hello to everybody,<o:p></o:p></p>
<div>
<p class="MsoNormal">I hope my question is appropriate for
this mail list. I have created 5 different buffer layers
(d=100,200,300,400,500 m) from a point vector. Now i want
to compute some zonal statistics using different rasters
as input. I know how to do that separately, but i was
wondering how could i automate this procedure using a
python script. I know python's basics, but i was not able
to do so following guidelines that i found on the
internet, e.g GRASS tutorial. Thank you in advance, A<o:p></o:p></p>
</div>
</div>
</div>
<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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</blockquote>
<pre class="moz-signature" cols="72">--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918</pre>
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