mapnik/tests/data/good_maps/raster_symbolizer.xml

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+init=epsg:32630">

  <Style name="elevation" >
    <Rule>
      <RasterSymbolizer opacity="10%"/ >
      
      
        <RasterColorizer>
          <!-- range (interpolated) -->
          <color max="100" fill="white" />
          <! -- more like css? start/end-->
          <gradient start="100" stop="400" start-color="red" stop-color="green"/>

          <gradient min="400" max="500" min_color="green" max_color="yellow"/>

          <gradient>
            <lower color="white">
            <break color="red" value="100">
            <break color="green" value="200">
            <break color="yelow" value="400">
            <upper color="transparent" value="500">
          </gradient>

          <gradient lower="white" upper="pink" method="breaks|steps|equal-interval|...">
            <break color="red" value="100">
            <break color="green" value="200">
            <break color="yelow" value="400">
          </gradient>

          <!-- binning -->
          <gradient lower="white" upper="pink" method="breaks|steps|equal-interval|...">
            <break color="red" value="100">
            <break color="green" value="200">
            <break color="yelow" value="400">
          </gradient>

          <!-- gradient -->
          <gradient lower="white" upper="pink" method="breaks|steps|equal-interval|...">
            <break color="red" value="100">
            <break color="green" value="200">
            <break color="yelow" value="400">
          </gradient>

          <color min="520" fill="black" />

          <!-- descrete -->
          <apply|map|match min="12" max="12" color="red" />
          <color min="50" max="50" fill="green" />          
          <color min="500" max="520" fill="blue" />
          
          
          <!-- take 122 -->
          <discrete color="white" /> <!-- white <100 -->
          <discrete color="red" value="100" /> <!-- red:green 100-200 -->
          <gradient color="green" value="200" /> <!-- green:yellow 200-400 -->
          <gradient color="yellow" value="400" />
          <discrete color="black" /> <!-- black >=400 -->
          
        <RasterColorizer mode="linear" before="blue">
          <stop color="red" value="100" /> <!-- 100-200 = red>green -->
          <stop color="green" value="200" /> <!-- 200-400 = green>yellow -->
          <stop color="yellow" value="400" />
        </RasterColorizer>
        <style>
          #layer [band=1] {
            raster-linear-gradient: blue, red 100, green 200, yellow 400;
            
            raster-discrete: transparent, green 100, yellow 200, black 400;
          }
        </style>
          
        <RasterColorizer mode="discrete" before="transparent"><!-- 0-100=alpha -->
          <stop color="green" value="100" /> <!-- 100-200=green -->
          <stop color="yellow" value="200" /> <!-- 200-400=yellow -->
          <stop color="black" value="400" /> <!-- >=400=black -->
          <stop value="450" /> <!-- >=450=transparent -->
        </RasterColorizer>
        <style>
          #layer [band=1] {
            raster-opacity:.5
            raster-scaling: bilinear 1
            raster-discrete: transparent, green 100, yellow 200, black 400;
          }
        </style>
        
        <RasterColorizer mode="exact">
          <stop color="red" value="12" />
          <stop color="green" value="122" />
          <stop color="blue" value="123" />
          <!-- every other color not drawn -->
        </RasterColorizer>
        <style>
          #layer [value=12] {
            raster-color: red;
          }
          #layer [value=122] {
            raster-color: green;
          }
          #layer [value=123] {
            raster-color: blue;
          }
          
          /*implement filters for rasters in mapnik */
          #layer [value<75][value>50] {
            raster-color: pink;
            raster-linear-gradient: pink, blue 60, black 90, brown 100;
          }

          #layer {
            raster-opacity:.5
            raster-scaling: bilinear 1
          }

          #layer {
            raster-classes: red 12, green 122, blue 123;
          }
        </style>
        
        
      </RasterSymbolizer>
    </Rule>
  </Style>

  <Layer name="dataraster" srs="+init=epsg:32630">
      <StyleName>elevation</StyleName>
      <Datasource>
          <Parameter name="file">/Users/dane/projects/mapnik-dev/trunk/tests/data/raster/dataraster.tif</Parameter>
          <Parameter name="type">gdal</Parameter>
          <Parameter name="band">1</Parameter>
      </Datasource>
  </Layer>

</Map>