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I think you can solve this problem nicely by moving everything to
rasters. There is the concept of a "cost" raster that totals how
difficult it is to go from a certain start point to anywhere else in
the region. In your case, instead of total "difficulty" you would
total potential biomass. You would create a raster showing the total
biomass "collected" by starting at each biogas plant.<br>
<br>
This could be done with the GRASS module r.cost. See [1].<br>
Your polygon layer of biogas potential would be imported into GRASS,
then converted to a raster (v.to.rast). You would also import the
point layer of plants into GRASS as a point vector. Then run the
module with the biogas potential as the input parameter, and the
plants as the "start_points". And you would set a value for the
"max_cost" parameter which would be the maximum biomass any plants
needs. Again, the output raster would represent the total amount of
biomass accumulated when starting from any of the plants.<br>
<br>
Hope that helps <br>
<br>
<br>
[1] <a class="moz-txt-link-freetext" href="http://grass.osgeo.org/grass70/manuals/r.cost.html">http://grass.osgeo.org/grass70/manuals/r.cost.html</a><br>
<br>
<div class="moz-cite-prefix">On 07/03/2015 02:35 PM, Julie Houge
Hansen wrote:<br>
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<p class="MsoNormal">Dear all<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have tried asking my local QGIS expert
but unfortunately she is for once not able to help me. I hope
someone can.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="mso-list:Ignore">-<span style="font:7.0pt "Times
New Roman"">
</span></span><!--[endif]-->I have a vector polygon layer
that contains data for the amount of biogas potentially
available in a polygon - unit is m3/ha/year. The polygons are
of varying size.
<o:p></o:p></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="mso-list:Ignore">-<span style="font:7.0pt "Times
New Roman"">
</span></span><!--[endif]-->I have another vector point
layer with data for the amount of biogas already produced on
specific biogas plants – unit in m3/year.
<o:p></o:p></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="mso-list:Ignore">-<span style="font:7.0pt "Times
New Roman"">
</span></span><!--[endif]-->I would like to combine the two
layers so that I “vacuum” the area surrounding the biogas
plants for biogas potential. This will reveal where there are
still areas with sufficient biomass available for a new biogas
plant to be build.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have no clue how to do this calculation
but I think it should be possible. Can anyone help me out?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The overview I have of my data now looks
like this: <o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><img
id="Pladsholder_x0020_til_x0020_indhold_x0020_6"
src="cid:part1.01060603.03000105@arava.co.il" height="441"
width="478"></span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The size of the shown point data is <b>independent</b>
on the polygon layer. I would like it to be
<b>dependent</b> on the biogas potential available (in the
polygon layer). I would like the size of the points to reflect
how far you would have to drive (radius to the biogas plant)
in order to get all the biomass needed to produce the biogas
you intend to.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am using QGIS version 2.8.2 64 bit with
Windows. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="font-size:8.0pt;color:black;mso-fareast-language:EN-GB"
lang="EN-CA">Best regards<br>
<br>
</span><b><span
style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:black;mso-fareast-language:EN-GB">Julie
Houge Hansen</span></b><span
style="font-size:8.0pt;color:black;mso-fareast-language:EN-GB"
lang="EN-CA"><br>
PhD Student, Inst. of Chemical Eng., Biotechnology and
Environmental Tech.</span><span
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