Azzurra Lentini wrote:
I must draw four different concentric circles (with different sizes and same center) in many different positions: about these positions I know the center of the circles (shape file of points).
In Layer Properties > Symbology of your points shape file: For Marker you could specify an Ellipse Marker and set its size to the desired size in Map Units. You can have multiple markers, so you could have 4 of such Ellipse Markers, each with it own size. Downside is that those concentric circles will only show in the display and/or PDFs, but are not a separate shape layer of their own. Depends what you need them for. I've used a similar approach to display error bounds (95%) for GSP'ed points. There are 3 error ellipse arguments provided from CSRS-PPP for post-processed points, which are used in expressions for: data Setting Expression major axis Width "er_maj" *2 minor axis Height "er_min" *2 orientation Rotation "er_az"+90 Works a treat! -- Garth Fletcher _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
