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:[email protected]]
Sent: 04 January 2013 13:41
To: Chris Haste; [email protected]
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 <TextSymbolizer>:
1. Use a type face that contains the symbols you would like to plot, e.g,
"OpenSymbol", "Symbol"
2. A <TextSymbolizer> tag can actually contain an <ExternalGraphic> tag,
typically used to render so-called highway shields. You would put a space or
dot for a label and add an <ExternalGraphic>-tag to hold the symbol would like
to plot:
<TextSymbolizer>
<Label>.</Label>
<Font>
<CssParameter name="font-family">Liberation Sans</CssParameter>
<CssParameter name="font-size">10</CssParameter>
</Font>
<LabelPlacement>
<PointPlacement>
<AnchorPoint>
<AnchorPointX>0.5</AnchorPointX>
<AnchorPointY>0.5</AnchorPointY>
</AnchorPoint>
</PointPlacement>
</LabelPlacement>
<Fill>
<CssParameter name="fill">#ff0000</CssParameter>
</Fill>
<Graphic>
<ExternalGraphic>
<OnlineResource xlink:type="simple" xlink:href="/symbols/red.svg"/>
<Format>image/svg+xml</Format>
</ExternalGraphic>
</Graphic>
<Priority>150000</Priority>
<VendorOption name="spaceAround">20</VendorOption>
</TextSymbolizer>
If you are using a dot for a label, make sure to have it the same colour as
your symbol ;-)
HTH
Edward
________________________________
From: [email protected]
To: [email protected]
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:[email protected]]
Sent: 04 January 2013 12:29
To: Chris Haste; [email protected]; [email protected]
Subject: RE: [Geoserver-users] [bulk]: Decluttering/SLD/CSS
Use multiple <FeatureTypeStyle> tags in your SLD. First <FeatureTypeStyle> tags
contain least important symbols, while consecutive <FeatureTypeStyle>-tags
contain more important symbols. You can use the <ogc:Filter> to specify the
attribute that indicates the importance of the symbol.
Each <FeatureTypeStyle> 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: [email protected]
To: [email protected]; [email protected]
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:[email protected]]
Sent: 04 January 2013 11:53
To: [email protected]
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:[email protected]]
Sent: Friday, January 04, 2013 12:19 PM
To: [email protected]
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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