How to create an NDVI function dataset

Creating an NDVI function dataset

1. Create the Raster Function object.
2. Create the Function Raster Dataset object.
3. Create a name object for the function raster dataset.
4. Specify the output file name for the new dataset.

[C#]

// Create the Raster Function object.
IRasterFunction rasterFunction=new NDVIFunctionClass();
// Create the Function Raster Dataset object.
IFunctionRasterDataset functionRasterDataset=new FunctionRasterDataset();
// Create a name object for the Function Raster Dataset.
IFunctionRasterDatasetName functionRasterDatasetName=(IFunctionRasterDatasetName)
    new FunctionRasterDatasetName();
// Specify the output file name for the new dataset (including the .afr extension at the end).
functionRasterDatasetName.FullName=@"c:\temp\NDVIFunction.afr";
functionRasterDataset.FullName=(IName)functionRasterDatasetName;
// The input data can be of type IRasterDataset, IRasterBand, or IRaster.
// The input data for an NDVI function is a raster with its first two bands as the infrared 
// and near-infrared bands, respectively.
functionRasterDataset.Init(rasterFunction, inputData);

[VB.NET]

' Create the Raster Function object.
Dim rasterFunction As IRasterFunction
rasterFunction=New NDVIFunctionClass()
' Create the Function Raster Dataset object.
Dim functionRasterDataset As IFunctionRasterDataset
functionRasterDataset=New FunctionRasterDataset()
' Create a name object for the Function Raster Dataset.
Dim functionRasterDatasetName As IFunctionRasterDatasetName
functionRasterDatasetName=New FunctionRasterDatasetName()
' Specify the output file name for the new dataset (including the .afr extension at the end).
functionRasterDatasetName.FullName="c:\temp\NDVIFunction.afr"
functionRasterDataset.FullName=functionRasterDatasetName
' The input data can be of type IRasterDataset, IRasterBand, or IRaster.
' The input data for an NDVI function is a raster with its first two bands as the infrared
' and near-infrared bands, respectively.
functionRasterDataset.Init(rasterFunction, inputData)

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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.DataSourcesRaster
• ESRI.ArcGIS.Geodatabase
• ESRI.ArcGIS.System (ESRI.ArcGIS.esriSystem)

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ArcGIS for Desktop Advanced	ArcGIS for Desktop Advanced
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