[Qgis-user] Help! Cirle radius

[Lene Fischer]

Hi
If you have points/locations you can create bufferzones http://docs.qgis.org/2.2/en/docs/gentle_gis_introduction/vector_spatial_analysis_buffers.html
If you want to calculate use the fiels calculator. In this example change the function from Length to Area http://docs.qgis.org/2.2/en/docs/user_manual/working_with_vector/field_calculator.html

Regards

Lene Fischer
Associate Professor

Department of Geosciences and Natural Resource Management
University of Copenhagen

MOB +45 40115084
lfi at ign.ku.dk<mailto:lfi at ign.ku.dk>


[SCIENCE_bomaerke_UK]


Fra: qgis-user-bounces at lists.osgeo.org [mailto:qgis-user-bounces at lists.osgeo.org] På vegne af Nicolas Cadieux
Sendt: 4. januar 2015 03:33
Til: qgis-user at lists.osgeo.org
Emne: Re: [Qgis-user] Help! Cirle radius


Hi,
There are a number of plugin that can make circles.  ArcheoCad, is one of them.  If is does not work the way you want, look for an other under CAD like plugins.  You can also create a 50k buffer around points.

Once you have the circle, save the layer and right click on the circle, and you will get the area.  If you want, you can create a field called 'area' in the layer with circles and you can generate the area using the Qgis  field calculator using and expression.

Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc.
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112  Fax: 514.381.4995
Le 2015-01-03 17:50, "Paula Urbina [via OSGeo.org]" <[hidden email]</user/SendEmail.jtp?type=node&node=5179913&i=0>> a écrit :

Could you please tell me, How I can assign a circle radius (X=50 km) to a location? And then How I can calculated the area covered by some circles?
Please, help me!!!!

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