Re: [Geoserver-users] "Disperse Markers" in geoserver/openlayers

Håvard Wahl Kongsgård Mon, 31 Oct 2011 12:07:02 -0700

Hi, again I tried altering your example (
http://demo1.geo-solutions.it/playground/styles/displace.sld ) using
different marker sizes without luck. What I'am doing wrong :-)



-Håvard


<?xml version="1.0" encoding="ISO-8859-1"?>
<StyledLayerDescriptor version="1.0.0"
    xsi:schemaLocation="http://www.opengis.net/sld StyledLayerDescriptor.xsd"
    xmlns="http://www.opengis.net/sld";
    xmlns:ogc="http://www.opengis.net/ogc";
    xmlns:xlink="http://www.w3.org/1999/xlink";
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
  <NamedLayer>
    <Name>Attribute-based point</Name>
    <UserStyle>
      <Title>GeoServer SLD Cook Book: Attribute-based point</Title>
      <FeatureTypeStyle>
        <Rule>
          <Name>SmallPop</Name>


          <Title>1 to 50000</Title>
          <ogc:Filter>
            <ogc:PropertyIsLessThan>
              <ogc:PropertyName>income_200</ogc:PropertyName>
              <ogc:Literal>50000</ogc:Literal>
            </ogc:PropertyIsLessThan>
          </ogc:Filter>

                   <TextSymbolizer>
            <Label><![CDATA[ ]]></Label>
            <Graphic>
              <Mark>
                <WellKnownName>circle</WellKnownName>
                <Fill>
                  <CssParameter name="fill">
                    <ogc:Literal>#FFFF00</ogc:Literal>
                  </CssParameter>
                </Fill>
                <Stroke>
                  <CssParameter name="stroke">
                    <ogc:Literal>#FF0000</ogc:Literal>
                  </CssParameter>
                  <CssParameter name="stroke-width">
                    <ogc:Literal>2</ogc:Literal>
                  </CssParameter>
                </Stroke>
              </Mark>
              <Opacity>
                <ogc:Literal>1.0</ogc:Literal>
              </Opacity>
              <Size>
                <ogc:Literal>5</ogc:Literal>
              </Size>
            </Graphic>
            <LabelPlacement>
              <PointPlacement>
                <AnchorPoint>
                  <AnchorPointX>0.5</AnchorPointX>
                  <AnchorPointY>0.5</AnchorPointY>
                </AnchorPoint>
              </PointPlacement>
            </LabelPlacement>
            <VendorOption name="maxDisplacement">16</VendorOption>
          </TextSymbolizer>




        </Rule>
        <Rule>
          <Name>MediumPop</Name>
          <Title>50000 to 100000</Title>
          <ogc:Filter>
            <ogc:And>
              <ogc:PropertyIsGreaterThanOrEqualTo>
                <ogc:PropertyName>income_200</ogc:PropertyName>
                <ogc:Literal>50000</ogc:Literal>
              </ogc:PropertyIsGreaterThanOrEqualTo>
              <ogc:PropertyIsLessThan>
                <ogc:PropertyName>income_200</ogc:PropertyName>
                <ogc:Literal>100000</ogc:Literal>
              </ogc:PropertyIsLessThan>
            </ogc:And>
          </ogc:Filter>


                             <TextSymbolizer>
            <Label><![CDATA[ ]]></Label>
            <Graphic>
              <Mark>
                <WellKnownName>circle</WellKnownName>
                <Fill>
                  <CssParameter name="fill">
                    <ogc:Literal>#FFFF00</ogc:Literal>
                  </CssParameter>
                </Fill>
                <Stroke>
                  <CssParameter name="stroke">
                    <ogc:Literal>#FF0000</ogc:Literal>
                  </CssParameter>
                  <CssParameter name="stroke-width">
                    <ogc:Literal>2</ogc:Literal>
                  </CssParameter>
                </Stroke>
              </Mark>
              <Opacity>
                <ogc:Literal>1.0</ogc:Literal>
              </Opacity>
              <Size>
                <ogc:Literal>8</ogc:Literal>
              </Size>
            </Graphic>
            <LabelPlacement>
              <PointPlacement>
                <AnchorPoint>
                  <AnchorPointX>0.5</AnchorPointX>
                  <AnchorPointY>0.5</AnchorPointY>
                </AnchorPoint>
              </PointPlacement>
            </LabelPlacement>
            <VendorOption name="maxDisplacement">16</VendorOption>
          </TextSymbolizer>



        </Rule>



        <Rule>
          <Name>LargePop</Name>
          <Title>Greater than 100000</Title>
          <ogc:Filter>
            <ogc:PropertyIsGreaterThanOrEqualTo>
              <ogc:PropertyName>income_200</ogc:PropertyName>
              <ogc:Literal>100000</ogc:Literal>
            </ogc:PropertyIsGreaterThanOrEqualTo>
          </ogc:Filter>

                             <TextSymbolizer>
            <Label><![CDATA[ ]]></Label>
            <Graphic>
              <Mark>
                <WellKnownName>circle</WellKnownName>
                <Fill>
                  <CssParameter name="fill">
                    <ogc:Literal>#FFFF00</ogc:Literal>
                  </CssParameter>
                </Fill>
                <Stroke>
                  <CssParameter name="stroke">
                    <ogc:Literal>#FF0000</ogc:Literal>
                  </CssParameter>
                  <CssParameter name="stroke-width">
                    <ogc:Literal>2</ogc:Literal>
                  </CssParameter>
                </Stroke>
              </Mark>
              <Opacity>
                <ogc:Literal>1.0</ogc:Literal>
              </Opacity>
              <Size>
                <ogc:Literal>10</ogc:Literal>
              </Size>
            </Graphic>
            <LabelPlacement>
              <PointPlacement>
                <AnchorPoint>
                  <AnchorPointX>0.5</AnchorPointX>
                  <AnchorPointY>0.5</AnchorPointY>
                </AnchorPoint>
              </PointPlacement>
            </LabelPlacement>
            <VendorOption name="maxDisplacement">16</VendorOption>
          </TextSymbolizer>


        </Rule>
      </FeatureTypeStyle>
    </UserStyle>
  </NamedLayer>
</StyledLayerDescriptor>


2011/9/22 Andrea Aime <[email protected]>:
> 2011/9/22 Håvard Wahl Kongsgård <[email protected]>:
>> Hi, I have a problem with overlapping points(identical XY). Googling I
>> found that Arcgis has a useful tool "Disperse Markers" which expands
>> clustered(overlapping points)
>> http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?id=1313&pid=1306&topicname=Disperse_Markers_(Cartography)
>> . Is a similar feature available in geoserver/openlayers for expanding
>> point clusters on the fly? The math behind it must be very simple, so
>> the alternative is to created a new geom in postigs with expanded
>> clusters.
>
> There is a little trick you can employ. Text symbolizers in GeoServer
> can be associated
> to a graphic, which in the original intention was the "road plate", a
> background graphic
> that would be moved along with the label
>
> Now, if your label is empty space you can use label displacement to
> actually move away
> the points in a controlled way.
> The downside if you want is that if a new position cannot be found,
> not even by moving
> it around within the specified distance, the point won't be painted at all.
>
> Here is an example map with cities:
> http://demo1.geo-solutions.it/playground/GeoSolutions/wms?LAYERS=GeoSolutions%3Acities&STYLES=stars&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&SRS=EPSG%3A4326&BBOX=-0.59257250976506,38.661416015626,24.887332275391,51.617299804688&WIDTH=649&HEIGHT=330
>
> and here is the same with the trick above:
> http://demo1.geo-solutions.it/playground/GeoSolutions/wms?LAYERS=GeoSolutions%3Acities&STYLES=displace&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&SRS=EPSG%3A4326&BBOX=-0.59257250976506,38.661416015626,24.887332275391,51.617299804688&WIDTH=649&HEIGHT=330
>
> I guess you'll need to play a bit with it to get it right, but it may work.
> The full style is here:
> http://demo1.geo-solutions.it/playground/styles/displace.sld
>
> Cheers
> Andrea
>
>
> --
> -------------------------------------------------------
> Ing. Andrea Aime
> GeoSolutions S.A.S.
> Tech lead
>
> Via Poggio alle Viti 1187
> 55054  Massarosa (LU)
> Italy
>
> phone: +39 0584 962313
> fax:      +39 0584 962313
>
> http://www.geo-solutions.it
> http://geo-solutions.blogspot.com/
> http://www.youtube.com/user/GeoSolutionsIT
> http://www.linkedin.com/in/andreaaime
> http://twitter.com/geowolf
>
> -------------------------------------------------------
>

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Re: [Geoserver-users] "Disperse Markers" in geoserver/openlayers

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