[Qgis-user] Question about city layer density

[Joris Hintjens]

HOLD IT!
From what I read, you misunderstood Szilard’s answer. You don’t need different layers per class of city magnitude. Within one layer, you ca ncreate scalable visibilty according to a property (number of inhabitants).

But why not use a simpler way: use an existing background layer (OSM or other) that hat scalable visibility already in the layer? I personaly like "OSM Stamen toner” for its slick black&white rendering
Joris



> Op 3 apr. 2016, om 14:13 heeft Joe Stepansky <kq3f at comcast.net> het volgende geschreven:
> 
> 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: szilard.albert at gmail.com [mailto:szilard.albert at gmail.com] On Behalf Of Szilard Albert
> Sent: Sunday, April 03, 2016 7:30 AM
> To: Joe Stepansky
> Cc: qgis-user at lists.osgeo.org
> 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 <kq3f at comcast.net <mailto:kq3f at comcast.net>> 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
> 
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> -- 
> Szilard Albert
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>  
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