[Qgis-user] Drawing circles on maps at 600 ft diameters out to 3000 feet from a specific point

[Brent Wood]

Hi,

The short answer is yes, QGIS can do that sort of stuff, but I'd use a different workflow which I think is easier.

If you have a spatially enabled database (Postgis, Spatialite, MySQL, MariaDB, etc), I'd do it there. Spatialite is probably the best to start with if you have not used one before.

Have a table with a point column for your points, add a polygon column for your 600ft circle, another for your 1200ft, etc,
Populate the columns by buffering the point with the appropriate radius (1/2 your circle diameter).
The quadrants can be generated several ways -eg:  ST_Project() will extend a line in a specified direction from a specified point, then clip those lines to each of the circles - and you have the quadrants.
Connect to the DB with QGIS, open the table and plot each of the columns as a separate QGIS map layer. Set the symbology of each circle to "no fill" or to mostly transparent. Make sure these layers are above your background/context layers.

Happy to help if you contact me off list.


Cheers

Brent Wood

Principal Technician, Fisheries
NIWA
DDI:  +64 (4) 3860529

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From: QGIS-User <qgis-user-bounces at lists.osgeo.org> on behalf of Michael Walker via QGIS-User <qgis-user at lists.osgeo.org>
Sent: Wednesday, February 26, 2025 14:26
To: qgis-user at lists.osgeo.org <qgis-user at lists.osgeo.org>
Subject: [Qgis-user] Drawing circles on maps at 600 ft diameters out to 3000 feet from a specific point

I am new to this software mapping program and am interested in creating some maps with circles around specific points on the map at 600 feet intervals.  (600 feet, 1200 feet, 1800 feet, 2400 feet and 3000 feet)  I will need to be able to draw these circles without covering the
aerial view or topographical view features under them as well as draw lines disecting these circles into 4 quardrans.   Is this software able to perform these tasks??

Any help is greatly appreciated,
Thanks

Michael J. Walker
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Brent Wood
Principal Technician - GIS and Spatial Data Management
Programme Leader - Environmental Information Delivery
+64-4-386-0529

National Institute of Water & Atmospheric Research Ltd (NIWA)
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