Respected sir/madam
I am looking for the codes to set the value of NoData pixeles to 0 value through C# programing.I need to calculate cube root of (B4-B3).Here B4=Band 3(NIR band),B3=Band3(Red band).So if B4>B3 then no problem but if B3>B4 then it comes as NoData because cube root of a negative value is a complex number. So I want to set this NoData values to 0.Please give some code in C#.
I have applied the following code
public void UsingRasterMapAlgebra(string filePath1, string fileName1, string filePath2, string fileName2)
{
//MessageBox.Show(System.Windows.Forms.ProgressBar.DefaultFont.ToString());
//Get rasters.
IRasterDataset inRas01 = new RasterDatasetClass();
inRas01.OpenFromFile(filePath1 + fileName1);
IRasterDataset inRas02 = new RasterDatasetClass();
inRas02.OpenFromFile(filePath2 + fileName2);
// create RasterMapAlgebraOp.
IMapAlgebraOp mapAlgebraOp;
mapAlgebraOp = new RasterMapAlgebraOpClass();
//Set environment.
IRasterAnalysisEnvironment env = default(IRasterAnalysisEnvironment);
env = (IRasterAnalysisEnvironment)mapAlgebraOp;
IWorkspaceFactory workspaceFactory = new RasterWorkspaceFactoryClass();
IWorkspace workspace = workspaceFactory.OpenFromFile(@"G:\data\image\1999etmdec\LE71370421999344SGS01\Arc object", 0);
env.OutWorkspace = workspace;
mapAlgebraOp.BindRaster((IGeoDataset)inRas01, "B1");
mapAlgebraOp.BindRaster((IGeoDataset)inRas02, "B2");
IRaster rasOut; IGeoDataset condition; IGeoDataset condition2;
IGeoDataset rasOutAVI;
IMxDocument pMxDocument = (IMxDocument)m_application.Document;
try
{
rasOut = (IRaster)mapAlgebraOp.Execute("(([B2] + 1) * (256 - [B1]) * ([B2] - [B1]))");
IMathOp pMathOp;
pMathOp = new RasterMathOps() as IMathOp;
rasOutAVI = pMathOp.Power((IGeoDataset)rasOut, .33);
//set NoData
IRasterProps rasterProps = (IRasterProps)rasOutAVI;
rasterProps.NoDataValue = 0;
// Display the AVI
IMap pMap = pMxDocument.FocusMap;
IRasterLayer pRasterLayer3 = new RasterLayerClass();
pRasterLayer3.CreateFromRaster(rasterProps as IRaster);
pRasterLayer3.Name = "AVI2";
pMap.AddLayer(pRasterLayer3);
ISaveAs2 saveAsAVI;
saveAsAVI = (ISaveAs2)rasterProps;
IRasterStorageDef rasterStorageDef = new RasterStorageDefClass();
IRasterStorageDef2 rasterStorageDef2 = (IRasterStorageDef2)rasterStorageDef;
rasterStorageDef2.PyramidLevel = 95;
saveAsAVI.SaveAsRasterDataset("AVI2.img", workspace, "IMAGINE Image", rasterStorageDef2);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
but this code is not replacing Nodata valued pixels with 0 value. Where I have done the mistake? is there any other code to replace Nodata value?
