Ahh, now that is interesting. I did wonder about going down that route.
Would anyone know if that ‘abuse’ is workable using CSS?
From: Edward Mac Gillavry [mailto:emacgillavry@anonymised.com]
Sent: 04 January 2013 13:41
To: Chris Haste; geoserver-users@anonymised.comeforge.net
Subject: RE: [Geoserver-users] [bulk]: Decluttering/SLD/CSS
Chris,
That’s right: the approach I outlined in my previous posting achieves a z-order of the rendering, though it doesn’t address the overlap. A next approach is actually to “abuse” the :
-
Use a type face that contains the symbols you would like to plot, e.g, “OpenSymbol”, “Symbol”
-
A tag can actually contain an tag, typically used to render so-called highway shields. You would put a space or dot for a label and add an -tag to hold the symbol would like to plot:
**.**
Liberation Sans
10
0.5
0.5
#ff0000
****
****
****
**image/svg+xml**
****
150000
20
If you are using a dot for a label, make sure to have it the same colour as your symbol 
HTH
Edward
From: CHaste@anonymised.com.2992…
To: emacgillavry@anonymised.com
Date: Fri, 4 Jan 2013 08:03:22 -0500
Subject: RE: [Geoserver-users] [bulk]: Decluttering/SLD/CSS
Thanks Edward.
If I understand you correctly that will simply achieve a sort of z-order to the rendering – placing the important symbols on top of the less important ones? If that is the case it isn’t really what I am trying to achieve as that would look rather messy. I want to hide the less important symbols if there isn’t room to render them.
From: Edward Mac Gillavry [mailto:emacgillavry@anonymised.com]
Sent: 04 January 2013 12:29
To: Chris Haste; stefan.engelhardt@anonymised.com; geoserver-users@anonymised.comrceforge.net
Subject: RE: [Geoserver-users] [bulk]: Decluttering/SLD/CSS
Use multiple tags in your SLD. First tags contain least important symbols, while consecutive -tags contain more important symbols. You can use the ogc:Filter to specify the attribute that indicates the importance of the symbol.
Each tag makes a full scan of the table and draws only the features that satisfy the ogc:Filter statement. Thus the most important symbols are drawn last on top of the less important symbols.
Regards,
Edward
From: CHaste@…2992…
To: Stefan.Engelhardt@anonymised.com; geoserver-users@anonymised.comeforge.net
Date: Fri, 4 Jan 2013 07:04:45 -0500
Subject: Re: [Geoserver-users] [bulk]: Decluttering/SLD/CSS
Thanks Stefan,
But my understanding is that that only applies to labels… it is control over the point symbols that I need/want.
Brgrds,
Chris
From: Stefan Engelhardt (HBT) [mailto:Stefan.Engelhardt@anonymised.com]
Sent: 04 January 2013 11:53
To: geoserver-users@anonymised.comge.net
Subject: Re: [Geoserver-users] [bulk]: Decluttering/SLD/CSS
Hi Chris,
without having done it by myself, I would expect, that priority would give you what you want:
http://docs.geoserver.org/2.1.0/user/styling/sld-reference/labeling.html
Cheers
Stefan
From: Chris Haste [mailto:CHaste@anonymised.com]
Sent: Friday, January 04, 2013 12:19 PM
To: geoserver-users@anonymised.comeforge.net
Subject: [bulk]: [Geoserver-users] Decluttering/SLD/CSS
Hello list and HNY to you all!
This is probably a very basic question so if someone can point me in the right direction it would be greatly appreciated.
I understand how to control labelling based on zoom level, priority and z-order to manage the clarity of the map. I also understand how to display or not display point symbols based on zoom level filters.
BUT I can’t work out how to control drawing symbols with the same degree of control as I have over labels.
I have points on a map that are more important than others but are all in the same layer. In areas where there are a lot of points, and the scale doesn’t support drawing them all clearly, I want to only display just the important ones (and their labels) but as the user zooms in and the screen real-estate increases I want to display more i.e. include the less important points. This is all doable via the scale filters, but causes an undesirable issue in areas where there are a low numbers of points – they only become visible when you are zoomed in. In these areas I would like to be able to display the less important points at the same time as limiting the display of points in the more congested areas to only show the important ones.
Any ideas on how to achieve this?
Thanks
Chris
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