[Qgis-user] Creating a square buffer area around a point

[Donovan Cameron]

You could generate a standard 30km buffer using the buffer tool in
Vector > Geoprocessing Tools > Buffer.

Then create an extent polygon from that output buffer using Vector >
Research Tools > Polygon from layer extent.

I'm curious of the extent polygon is going to retain the 30km distance
though.. Something to test out =)

On Mon, Mar 11, 2013 at 1:42 PM, Bernd Vogelgesang
<bernd.vogelgesang at gmx.de> wrote:
>
>> Dear all,
>> I have a point (from a shapefile) and I need to create a squared buffer,
>> centered on my point with a distance of 30 kms. How can I do this in QGIS?
>> Thanks
>> Regards,
>> Luisa
>
>
> I would:
> - add geometry column to that point
> - open dbf as spreadsheet
> - calculate 4 new coordinate pairs in thr rows below (Xmax/Ymax, Xmax,Ymin,
> Xmin/Ymax, Xmin/Ymin), where max= x+30000 and min = x-30000 (if this is a
> metric system)
> - save that to a csv-file and import with Add Text Delimited Layer
> - now you have the corner points, create a polygon layer and digitize a
> polygon with snapping to the point layer.
>
> There might be numerous ways to do that, but thats what first came to my
> mind.
>
> Bernd
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