地理服务器插值参数

Question

<?xml version="1.0"?>
<StyledLayerDescriptor 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" xmlns:gml="http://www.opengis.net/gml" version="1.0.0" xsi:schemaLocation="http://www.opengis.net/sld http://schemas.opengis.net/sld/1.0.0/StyledLayerDescriptor.xsd">
  <NamedLayer>
    <Name>USA states population</Name>
    <UserStyle>
      <Name>population</Name>
      <Title>Population in the United States</Title>
      <Abstract>A sample filter that filters the United States into three
          categories of population, drawn in different colors</Abstract>
      <FeatureTypeStyle>
        <Rule>
          <Title>&lt; 2M</Title>
          <PolygonSymbolizer>
            <Fill>
              <CssParameter name="fill">
                <ogc:Function name="Interpolate">
                  <!-- Property to transform -->
                  <ogc:PropertyName>t_p</ogc:PropertyName>
                  <!-- Mapping curve definition pairs (input, output) -->
                  <ogc:Function name="env">
                    <ogc:Literal>interval1</ogc:Literal>
                    <ogc:Literal>685430</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="env">
                    <ogc:Literal>color1</ogc:Literal>
                    <ogc:Literal>#06E852</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="env">
                    <ogc:Literal>interval2</ogc:Literal>
                    <ogc:Literal>1000000</ogc:Literal>
                  </ogc:Function>
                  <ogc:Function name="env">
                    <ogc:Literal>color2</ogc:Literal>
                    <ogc:Literal>#FF0303</ogc:Literal>
                  </ogc:Function>
                  <!-- Interpolation method -->
                  <ogc:Literal>color</ogc:Literal>
                  <!-- Interpolation mode - defaults to linear -->
                </ogc:Function>
              </CssParameter>
            </Fill>
          </PolygonSymbolizer>
        </Rule>
        <Rule>
          <Title>Boundary</Title>
          <LineSymbolizer>
            <Stroke>
              <CssParameter name="stroke-width">0.2</CssParameter>
            </Stroke>
          </LineSymbolizer>
          <TextSymbolizer>
            <Label>
              <ogc:PropertyName>label</ogc:PropertyName>
            </Label>
            <Halo>
              <Radius>3</Radius>
              <Fill>
                <CssParameter name="fill">#FFFFFF</CssParameter>
              </Fill>
            </Halo>
            <Font>
              <CssParameter name="font-family">Times New Roman</CssParameter>
              <CssParameter name="font-style">Normal</CssParameter>
              <CssParameter name="font-size">14</CssParameter>
            </Font>
            <LabelPlacement>
              <PointPlacement>
                <AnchorPoint>
                  <AnchorPointX>0.5</AnchorPointX>
                  <AnchorPointY>0.5</AnchorPointY>
                </AnchorPoint>
              </PointPlacement>
            </LabelPlacement>
          </TextSymbolizer>
        </Rule>
      </FeatureTypeStyle>
    </UserStyle>
  </NamedLayer>
</StyledLayerDescriptor>

我层的 SLD 看起来像这样，其中我以两个 ogc 函数的形式给出了两个变量 minpop 和 maxpop。在此 SLD 中，我为变量赋值，这些值被用作 ogc 函数的参数，但 ogc 函数似乎无法正常工作。

我试过不在文字中包含环境，但颜色仍然不起作用？能否请您指出上述SLD中的错误？

Answer 1

通过将您的函数包含在 <Literal> 块中，您要求 GeoServer 将其用作文本。您的 XML 应如下所示：

<Fill>
  <CssParameter name="fill">
    <ogc:Function name="Interpolate">
      <!-- Property to transform -->
      <ogc:PropertyName>POP</ogc:PropertyName>
      <!-- Mapping curve definition pairs (input, output) -->
      <ogc:Function name="env">
        <ogc:Literal>minpop</ogc:Literal>
        <ogc:Literal>64000</ogc:Literal>
      </ogc:Function> 
      <ogc:Literal>#06E852</ogc:Literal>
      <ogc:Function name="env">
        <ogc:Literal>maxpop</ogc:Literal>
        <ogc:Literal>100000000</ogc:Literal>
      </ogc:Function> 
      <ogc:Literal>#FF0303</ogc:Literal> 
      <!-- Interpolation method -->
      <ogc:Literal>color</ogc:Literal>
      <!-- Interpolation mode - defaults to linear -->
    </ogc:Function>
  </CssParameter> 
</Fill>

地理服务器插值参数

Geoserver interpolation parameters

interpolation

geoserver