Examples of ChannelSelection

org.geotools.styling.ChannelSelection
The ChannelSelection element specifies the false-color channel selection for a multi-spectral raster source (such as a multi-band satellite-imagery source). It is defined as:
```
 <xs:element name="ChannelSelection"> <xs:complexType> <xs:choice> <xs:sequence> <xs:element ref="sld:RedChannel"/> <xs:element ref="sld:GreenChannel"/> <xs:element ref="sld:BlueChannel"/> </xs:sequence> <xs:element ref="sld:GrayChannel"/> </xs:choice> </xs:complexType> </xs:element> <xs:element name="RedChannel" type="sld:SelectedChannelType"/> <xs:element name="GreenChannel" type="sld:SelectedChannelType"/> <xs:element name="BlueChannel" type="sld:SelectedChannelType"/> <xs:element name="GrayChannel" type="sld:SelectedChannelType"/> 
```
Either a channel may be selected to display in each of red, green, and blue, or a single channel may be selected to display in grayscale. (The spelling ?gray? is used since it seems to be more common on the Web than ?grey? by a ratio of about 3:1.) Contrast enhancement may be applied to each channel in isolation. Channels are identified by a system and data-dependent character identifier. Commonly, channels will be labelled as ?1?, ?2?, etc. @author iant @source $URL$

Examples of org.geotools.styling.ChannelSelection

    StyleBuilder sldBuilder = new StyleBuilder();
    // the RasterSymbolizer Helper
    rsh = new RasterSymbolizerHelper(gc, null);


    final RasterSymbolizer rsb_1 = sldBuilder.createRasterSymbolizer();
    final ChannelSelection chSel = new ChannelSelectionImpl();
    final SelectedChannelType chTypeGray    = new SelectedChannelTypeImpl();
    final ContrastEnhancement cntEnh = new ContrastEnhancementImpl();


    cntEnh.setMethod(ContrastMethod.HISTOGRAM);;
    //cntEnh.setGammaValue(sldBuilder.literalExpression(0.50));
    
    chTypeGray.setChannelName("1");    
    chSel.setGrayChannel(chTypeGray);


    rsb_1.setChannelSelection(chSel);
    rsb_1.setOpacity(sldBuilder.literalExpression(1.0));
    rsb_1.setContrastEnhancement(cntEnh);
    rsb_1.setOverlap(sldBuilder.literalExpression("AVERAGE"));

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Examples of org.geotools.styling.ChannelSelection

    StyleBuilder sldBuilder = new StyleBuilder();
    // the RasterSymbolizer Helper
    rsh = new RasterSymbolizerHelper(gc, null);


    final RasterSymbolizer rsb_1 = sldBuilder.createRasterSymbolizer();
    final ChannelSelection chSel = new ChannelSelectionImpl();
    final SelectedChannelType chTypeGray = new SelectedChannelTypeImpl();
    final ContrastEnhancement cntEnh = new ContrastEnhancementImpl();


    //this will convert to byte!!!
    cntEnh.setMethod(ContrastMethod.HISTOGRAM);
    chTypeGray.setChannelName("1");
    chTypeGray.setContrastEnhancement(cntEnh);
    chSel.setGrayChannel(chTypeGray);
    rsb_1.setChannelSelection(chSel);
    
    // visit the RasterSymbolizer
    rsh.visit(rsb_1);
    final RenderedImage im=((GridCoverage2D) rsh.getOutput()).getRenderedImage();

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Examples of org.geotools.styling.ChannelSelection

    StyleBuilder sldBuilder = new StyleBuilder();
    // the RasterSymbolizer Helper
    rsh = new RasterSymbolizerHelper(gc, null);


    final RasterSymbolizer rsb_1 = sldBuilder.createRasterSymbolizer();
    final ChannelSelection chSel = new ChannelSelectionImpl();
    final SelectedChannelType chTypeGray = new SelectedChannelTypeImpl();
    chTypeGray.setChannelName("1");
    chSel.setGrayChannel(chTypeGray);
    rsb_1.setChannelSelection(chSel);
    rsb_1.setOpacity(sldBuilder.literalExpression(1.0));
    final ColorMap cm = sldBuilder.createColorMap(
        new String[] { // labels
          "category",

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Examples of org.geotools.styling.ChannelSelection

    // /////////////////////////////////////////////////////////////////////
    //
    // CHANNEL SELECTION
    //
    // /////////////////////////////////////////////////////////////////////
    final ChannelSelection cs = rs.getChannelSelection();
    csNode.addSource(this.getSource(0));
    csNode.addSink(cmNode);
    csNode.visit(cs);


    // /////////////////////////////////////////////////////////////////////

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Examples of org.geotools.styling.ChannelSelection


    public ChannelSelection build() {
        if (unset) {
            return null;
        }
        ChannelSelection result;
        if (gray.isUnset()) {
            result = sf.channelSelection(red.build(), green.build(), blue.build());
        } else {
            result = sf.channelSelection(gray.build());
        }

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Examples of org.geotools.styling.ChannelSelection

    private Style createGreyscaleStyle(int band) {
        ContrastEnhancement ce = sf.contrastEnhancement(ff.literal(1.0), ContrastMethod.NORMALIZE);
        SelectedChannelType sct = sf.createSelectedChannelType(String.valueOf(band), ce);


        RasterSymbolizer sym = sf.getDefaultRasterSymbolizer();
        ChannelSelection sel = sf.channelSelection(sct);
        sym.setChannelSelection(sel);


        return SLD.wrapSymbolizers(sym);
    }

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Examples of org.geotools.styling.ChannelSelection

        ContrastEnhancement ce = sf.contrastEnhancement(ff.literal(1.0), ContrastMethod.NORMALIZE);
        for (int i = 0; i < 3; i++) {
            sct[i] = sf.createSelectedChannelType(String.valueOf(channelNum[i]), ce);
        }
        RasterSymbolizer sym = sf.getDefaultRasterSymbolizer();
        ChannelSelection sel = sf.channelSelection(sct[RED], sct[GREEN], sct[BLUE]);
        sym.setChannelSelection(sel);


        return SLD.wrapSymbolizers(sym);
    }

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Examples of org.geotools.styling.ChannelSelection

    
    protected ChannelSelection copy(ChannelSelection channelSelection) {
        if( channelSelection == null ) return null;
     
        SelectedChannelType[] channels = copy( channelSelection.getSelectedChannels() );
        ChannelSelection copy = sf.createChannelSelection( channels);
        copy.setGrayChannel( copy( channelSelection.getGrayChannel() ));
        copy.setRGBChannels( copy( channelSelection.getRGBChannels() ));
        return copy;
    }

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Examples of org.geotools.styling.ChannelSelection

    }


    public void visit(ChannelSelection cs) {
        //get the channels
        final SelectedChannelType sct[] = copy(cs.getSelectedChannels());
        final ChannelSelection copy = sf.createChannelSelection(sct);
        if (STRICT && !copy.equals(cs)) {
            throw new IllegalStateException("Was unable to duplicate provided ChannelSelection:" + cs);
        }
        pages.push(copy);


    }

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Examples of org.geotools.styling.ChannelSelection

     * @generated modifiable
     */
    public Object parse(ElementInstance instance, Node node, Object value)
        throws Exception {
        
        ChannelSelection cs = styleFactory.createChannelSelection(null);
        
        if (node.hasChild("GrayChannel")) {
            cs.setGrayChannel((SelectedChannelType) node.getChildValue("GrayChannel"));
        }
        else {
            SelectedChannelType[] rgb = new SelectedChannelType[] {
                (SelectedChannelType) node.getChildValue("RedChannel"),
                (SelectedChannelType) node.getChildValue("GreenChannel"),
                (SelectedChannelType) node.getChildValue("BlueChannel")
            };
            cs.setRGBChannels(rgb);
        }
        
        return cs;
    }

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