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

[Nicolas Cadieux]

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]	" <ml-node+s1560n5214430h91 at n6.nabble.com> 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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