Hi Julie,
Can you model it using the processing plugin? This way, you could use the
grass module from QGIS and that could automate the process if you need to do it
often. Look in the QGIS documentation for help on the creating a model.
Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc. 
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112  Fax: 514.381.4995
www.archeotec.ca
On Jul 6, 2015 7:50 AM, "Julie Houge Hansen [via OSGeo.org] "
<[email protected]> wrote:
Hi Kristian
I was hoping I would be able to find a more automatic way of doing this as I
have to do it many times… Maybe I have found a solution using the GRASS module
r.cost.
Thank you for your help!
Med venlig hilsen
Julie Houge Hansen
PhD Student, Inst. of Chemical Eng., Biotechnology and Environmental Tech.
Tlf.
<a href="tel:&#43;4565507212">+4565507212
Email
[hidden email]
Addr.
Niels Bohrs Allé 1, DK-5230 Odense M, Denmark
Campusvej 55 · 5230 Odense M · Tlf. 6550 1000 ·
www.sdu.dk
Fra: [hidden email] [mailto: [hidden email] ]
På vegne af Kristian Evers
Sendt: 3. juli 2015 14:46
Til: [hidden email]
Emne: Re: [Qgis-user] Vacuuming a vector polygon layer with a point layer in
QGIS 2.8.2 (windows)
Hi Julie.
You need to define a surrounding area for each of the biogas plants. I suggest
you base the surrounding areas on the polygons you already have, so that each
plant has a polygon that is a union of
several surrounding biogas-potential polygons. How to do this is up to you.
Hereafter you can select all potential-polygons that intersect the
plant-polygons and sum up the potentials within each of the plant-polygons.
I hope that was enough to bring you on the right track.
Kristian
Fra:
[hidden email] [ [hidden email] ]
På vegne af Julie Houge Hansen
Sendt: fredag 03. juli 2015 13:35
Til: [hidden email]
Emne: [Qgis-user] Vacuuming a vector polygon layer with a point layer in QGIS
2.8.2 (windows)
Dear all
I have tried asking my local QGIS expert but unfortunately she is for once not
able to help me. I hope someone can.
-
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.
-
I have another vector point layer with data for the amount of biogas already
produced on specific biogas plants – unit in m3/year.
-
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.
I have no clue how to do this calculation but I think it should be possible.
Can anyone help me out?
The overview I have of my data now looks like this:
The size of the shown point data is independent on the polygon layer. I would
like it to be
dependent 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.
I am using QGIS version 2.8.2 64 bit with Windows.
Best regards
Julie Houge Hansen
PhD Student, Inst. of Chemical Eng., Biotechnology and Environmental Tech.
Tlf.
<a href="tel:&#43;4565507212">+4565507212
Email
[hidden email]
Addr.
Niels Bohrs Allé 1, DK-5230 Odense M, Denmark
Campusvej 55 · 5230 Odense M · Tlf. 6550 1000 ·
www.sdu.dk
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