[Qgis-user] Question about city layer density

[Nicolas Cadieux]

Hi, 
I don't have Qgis front on me but  you can use expressions for scale rendering of labels. ($scale).   I think we can also do that with conditional formats objects properties.  You could set object to become transparent depending on the expression.  The below link is for labels but the same should apply to object formating... (I am pretty sure this is not a figments of my Imagination.)   This way, you could use only one layer. 
http://lists.osgeo.org/pipermail/qgis-user/2013-November/024825.html 
Nicolas 
On Apr 3, 2016 08:00, "Joe Stepansky [via OSGeo.org]" <ml-node+s1560n5259366h7 at n6.nabble.com> wrote: 

	Thank you Szilard. I knew about the scale dependent visibility, but hadn’t considered creating layers with different size cities and different visibility levels. That should work just fine.   Joe   From: [hidden email]  [mailto: [hidden email] ] On Behalf Of Szilard Albert Sent: Sunday, April 03, 2016 7:30 AM To: Joe Stepansky Cc: [hidden email] Subject: Re: [Qgis-user] Question about city layer density   Joe, what you seem to need is "scale dependent visibility". To achieve this, go to "layer properties", "general" tab, and enable "scale dependent visibility". Set your scales as preferred. This will show or hide all your cities, depending on the zoom level, but you can make different layers with different classes of cities, and enable/disable their visibility at different zoom levels. regards, Szilard   On 3 April 2016 at 21:01, Joe Stepansky < [hidden email] > wrote: I’m relatively new to QGIS, so forgive any naivete.   I’m working on a project displaying severe weather outlooks on a map of the US. It’s gone very well, but I have one issue. I’m using a layer which displays city locations and labels on the map. When zooming in to a specific state, all looks fine. But when I pull back to several states, the map can look cluttered with city points and labels.   The labels don’t run into each other, there are just so many of them when I zoom out. Is there some way to get QGIS to automatically remove “random” cities (I really don’t care which ones) as the map is zoomed out, and restore them as the map is zoomed in?   Right now I’m manually using a filter to remove “excess” cities, but I can’t seem to find a nice, automated solution.   Thanks for any help!   Joe Stepansky Harrisburg, PA _______________________________________________ Qgis-user mailing list [hidden email] List info: http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user -- Szilard Albert www.dayborogeo.com Phone: +61 7 3889 9505 Mobile: +61 403 860274   _______________________________________________
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