You might also do so in openlayers, leaflet and google api. You can show or
hide markers by a condition that checks for zoom level. Each of these APIs
have a method to get the current zoom level, so you can use that to build
your condition in javascript to display markers at a zoom level you define.
An example of this is done on this map. When you zoom in, clickable markers
appear and are shown based on the bbox.
http://tolerance.org/mix-it-up/map
Brian
On Fri, Apr 27, 2012 at 9:27 AM, Asle Benoni <[email protected]> wrote:
> Thanks! This was very helpful. I also was able to apply some
> zoom-based rules to my markers on other maps. How do I make text or
> markers not show until there is a certain zoom level. Like in the
> examples on docs.geoserver.org where the labels use the
> <VendorOption name="spaceAround">10</VendorOption>
> in the SLD, the labels don't show if they overlap. Can I also use this
> if I only want some markers to show at a certain zoom level? I don't
> have any priority on the markers but when you zoom out the map it
> looks like a big mess with thousands of markers together. I would like
> to show only some markers or a big "blob" just to symbolize that there
> are a lot of markers there. When you zoom in you can see more markers.
> Is this something that is done on GeoServer or is this OpenLayers
> stuff?
>
> ~asle
>
> 2012/4/26 Edward Mac Gillavry <[email protected]>
> >
> > Asle,
> >
> > Check out the MinScaleDenominator and MaxScaleDenominator tags:
> >
> >
> http://docs.geoserver.org/latest/en/user/styling/sld-cookbook/points.html#zoom-based-point
> >
> > Also, you want to build in some priority: labelling bigger cities with a
> higher priority than labelling smaller hamlets. That's where the Priority
> tags helps out:
> >
> >
> http://docs.geoserver.org/latest/en/user/styling/sld-reference/labeling.html#priority-labeling-priority
> >
> > regards,
> >
> > Edward
> >
> > ________________________________
> > Date: Thu, 26 Apr 2012 21:41:23 +0200
> > Subject: Re: [Geoserver-users] How do I make a text layer (text instead
> of markers)?
> > From: [email protected]
> > To: [email protected]
> > CC: [email protected]
> >
> >
> > Hi Edward,
> > Thanks for helping out!
> > I read the GeoServer docs link you pointed out. But I wonder how do I
> get some text labels to show only when zoomed in to a certain zoom level. I
> would not want the street names of a city to show when I view the whole
> country but when I have zoomed in to street level I want to show the street
> names. That must be possible but how?
> > Thanks.
> > ~asle
> >
> > 2012/4/26 Edward Mac Gillavry <[email protected]>
> >
> >
> > Hi Asle,
> >
> > That would be some sort of labelling, right? In that case, there's the
> TextSymbolizer you can use in your SLD. You use the Label tag. The
> Propertyname contains the name of the column in your PostGIS database that
> you want to use to label the locations.
> >
> > <TextSymbolizer>
> > <Label>
> > <ogc:PropertyName>column_name</ogc:PropertyName>
> > </Label>
> > ...
> > </TextSymbolizer>
> >
> > More on the TextSymbolizer and Labelling
> http://docs.geoserver.org/latest/en/user/styling/sld-reference/labeling.html
> >
> > Regards,
> >
> > Edward
> >
> > ________________________________
> > Date: Thu, 26 Apr 2012 19:14:10 +0200
> > From: [email protected]
> > To: [email protected]
> > Subject: [Geoserver-users] How do I make a text layer (text instead of
> markers)?
> >
> >
> > Hello,
> > I have a geoserver 2.1 running fine with many layers with markers.
> > I want to show a layer where the markers are the text from a field in
> the database (Postgis) instead of an icon. How do I do that? Can anyone
> send me in the right direction? Do I use SLD styling? Or do I do this in
> OpenLayers etc.? Thanks for any help to a newbie!
> > ~asle
> >
> >
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