[OpenLayers-Dev] displaying data at multiple levels through open layers wms

[Juan G]

I think this is possible using SLD (styles) for displaying or not some
graphics in WMS.

We´ve done examples of doing this for the "Presas" layer in this URL:
http://www.mirame.chduero.es/DMADuero_09_Viewer. To open the layerSwitcher
click on the big white arrow at the upper-right corner in the screen.

Here is the part of the sld (
http://www.mirame.chduero.es/DMADuero_09_Viewer/wise.xml) that shows or not
a graphic depending the scale (zoom).


<sld:NamedLayer>
> <sld:Name>Presas</sld:Name>
> <sld:UserStyle>
> <sld:Name>Style1</sld:Name>
>
> <sld:FeatureTypeStyle>
> <sld:FeatureTypeName>Presas</sld:FeatureTypeName>
> <sld:Rule>
> <sld:Name/>
> <sld:Title>  </sld:Title>
> <sld:MaxScaleDenominator>1000000</sld:MaxScaleDenominator>
> <sld:PointSymbolizer>
> <sld:Graphic>
> <sld:ExternalGraphic>
> <sld:OnlineResource xlink:href="
> http://www.mirame.chduero.es/DMADuero_09_Viewer/img/sld/dam.gif"/>
> <sld:Format>image/gif</sld:Format>
> </sld:ExternalGraphic>
> <sld:Size>1</sld:Size>
> <sld:Opacity>1</sld:Opacity>
> </sld:Graphic>
> </sld:PointSymbolizer>
> </sld:Rule>
> <sld:Rule>
> <sld:Name/>
> <sld:Title>  </sld:Title>
> <sld:MinScaleDenominator>1000000</sld:MinScaleDenominator>
> <sld:PointSymbolizer>
> <sld:Graphic>
> <sld:Mark>
> <sld:WellKnownName>triangle</sld:WellKnownName>
> <sld:Fill>
> <sld:CssParameter name="fill">#555555</sld:CssParameter>
> <sld:CssParameter name="fill-opacity">1.0</sld:CssParameter>
> </sld:Fill>
> </sld:Mark>
> <sld:Size>11</sld:Size>
> <sld:Rotation>0</sld:Rotation>
> </sld:Graphic>
> </sld:PointSymbolizer>
> </sld:Rule>
> </sld:FeatureTypeStyle>
> </sld:UserStyle>
> </sld:NamedLayer>
>


2008/6/23 Darko Radiceski <radiceski at gmail.com>:

> Dear all,
>
> I have a raster that contains millions of point published through Arc IMS
> in a WMS service. I am trying to design a way to limit the number of points
> that get displayed based on the map zoom level. I have numbered the levels
> on the database side.
>
> Is it possible to somehow in the WMS call for Open Layers to include the
> zoom level that would be used at the Arc IMS side to select the wanted
> features?
>
> Cheers
> Dan
> --
> Radiceski Dan
> University of Wollongong
> Australia
> SIFE - UOW Chapter - Alumni
> CASUAL ACADEMIC STAFF TEACHING - UOW SITACS
> (School of Information Technology and Computer Science,University of
> Wollongong)
> Univeristy of Wollongong - Alumni
>
> _______________________________________________
> Dev mailing list
> Dev at openlayers.org
> http://openlayers.org/mailman/listinfo/dev
>
>


-- 
Un saludo,

Juan Gonzalez del Pino
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