How to create a raster classify renderer

Creating a raster classify renderer

1. Create the classify renderer.
2. Set up the renderer properties.
3. Set the color ramp for the symbology.
4. Create the symbol for the classes.
   
   See the following code example:
   

[C#]

public IRasterRenderer ClassifyRenderer(ESRI.ArcGIS.Geodatabase.IRasterDataset
    rasterDataset)
{
    try
    {
        //Create the classify renderer.
        IRasterClassifyColorRampRenderer classifyRenderer=new
            RasterClassifyColorRampRendererClass();
        IRasterRenderer rasterRenderer=(IRasterRenderer)classifyRenderer;

        //Set up the renderer properties.
        IRaster raster=rasterDataset.CreateDefaultRaster();
        rasterRenderer.Raster=raster;
        classifyRenderer.ClassCount=3;
        rasterRenderer.Update();

        //Set the color ramp for the symbology.
        IAlgorithmicColorRamp colorRamp=new AlgorithmicColorRampClass();
        colorRamp.Size=3;
        bool createColorRamp;
        colorRamp.CreateRamp(out createColorRamp);

        //Create the symbol for the classes.
        IFillSymbol fillSymbol=new SimpleFillSymbolClass();
        for (int i=0; i < classifyRenderer.ClassCount; i++)
        {
            fillSymbol.Color=colorRamp.get_Color(i);
            classifyRenderer.set_Symbol(i, (ISymbol)fillSymbol);
            classifyRenderer.set_Label(i, Convert.ToString(i));
        }
        return rasterRenderer;
    }
    catch (Exception ex)
    {
        System.Diagnostics.Debug.WriteLine(ex.Message);
        return null;
    }
}

[VB.NET]

Public Function ClassifyRenderer(ByVal rasterDataset As ESRI.ArcGIS.Geodatabase.IRasterDataset) As IRasterRenderer
    Try
    'Create the classify renderer.
    Dim classifyRenderer As IRasterClassifyColorRampRenderer=New RasterClassifyColorRampRendererClass()
    Dim rasterRenderer As IRasterRenderer=CType(classifyRenderer, IRasterRenderer)
    
    'Set up the renderer properties.
    Dim raster As IRaster=rasterDataset.CreateDefaultRaster()
    rasterRenderer.Raster=raster
    classifyRenderer.ClassCount=3
    rasterRenderer.Update()
    
    'Set the color ramp for the symbology.
    Dim colorRamp As IAlgorithmicColorRamp=New AlgorithmicColorRampClass()
    colorRamp.Size=3
    Dim createColorRamp As Boolean
    colorRamp.CreateRamp( createColorRamp)
    
    'Create the symbol for the classes.
    Dim fillSymbol As IFillSymbol=New SimpleFillSymbolClass()
    Dim i As Integer
    For i=0 To classifyRenderer.ClassCount - 1 Step i + 1
        fillSymbol.Color=colorRamp.get_Color(i)
        classifyRenderer.set_Symbol(i, CType(fillSymbol, ISymbol))
        classifyRenderer.set_Label(i, Convert.ToString(i))
    Next
    Return rasterRenderer
    Catch ex As Exception
    System.Diagnostics.Debug.WriteLine(ex.Message)
    Return Nothing
    End Try
End Function

See Also:

How to create a raster layer

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To use the code in this topic, reference the following assemblies in your Visual Studio project. In the code files, you will need using (C#) or Imports (VB .NET) directives for the corresponding namespaces (given in parenthesis below if different from the assembly name):

• ESRI.ArcGIS.System (ESRI.ArcGIS.esriSystem)
• ESRI.ArcGIS.Display
• ESRI.ArcGIS.Geometry
• ESRI.ArcGIS.DataSourcesGDB
• ESRI.ArcGIS.Geodatabase
• ESRI.ArcGIS.DataSourcesRaster
• ESRI.ArcGIS.Carto

Development licensing	Deployment licensing
ArcGIS Desktop Advanced	ArcGIS Desktop Advanced
ArcGIS Desktop Standard	ArcGIS Desktop Standard
ArcGIS Desktop Basic	ArcGIS Desktop Advanced
Engine Developer Kit	Engine