[Qgis-user] Vacuuming a vector polygon layer with a point layer in QGIS 2.8.2 (windows)

[Kristian Evers]

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: qgis-user-bounces at lists.osgeo.org [mailto:qgis-user-bounces at lists.osgeo.org] På vegne af Julie Houge Hansen
Sendt: fredag 03. juli 2015 13:35
Til: qgis-user at lists.osgeo.org
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:
[cid:image002.jpg at 01D0B59E.EA35A9B0]

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.

+4565507212<tel:+4565507212>

Email

juhh at kbm.sdu.dk<mailto:juhh at kbm.sdu.dk>

Addr.

Niels Bohrs Allé 1, DK-5230 Odense M, Denmark


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