How to create a Stretch function dataset

Creating a Stretch function dataset

To create a Stretch function dataset, follow these steps:
  1. Create the Function Arguments object.
  2. Set the stretch type.
  3. Create a Raster Function object.
  4. Create a Function Raster Dataset object.
  5. Create a name object for the function raster dataset.
  6. Specify the output file name for the new dataset.
  7. Initialize the new function raster dataset with the raster function and its input.
The following code example shows how to create a Stretch function raster dataset by applying the Stretch raster function to an image:
[C#] 
// Create the Function Arguments object.
IStretchFunctionArguments rasterFunctionArguments = (IStretchFunctionArguments)new
    StretchFunctionArgumentsClass();
// Set the stretch type (Minimum Maximum in this case).
rasterFunctionArguments.StretchType =
    esriRasterStretchType.esriRasterStretchMinimumMaximum;
// The input data can be of type IRasterDataset, IRasterBand, or IRaster.
rasterFunctionArguments.Raster = inputData;

// Create the Raster Function object.
IRasterFunction rasterFunction = new StretchFunction();
// 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\StretchFunction.afr";
functionRasterDataset.FullName = (IName)functionRasterDatasetName;
// Initialize the new Function Raster Dataset with the Raster Function and its input. 
// The input data can be of type IRasterDataset, IRasterBand, or IRaster.
functionRasterDataset.Init(rasterFunction, rasterFunctionArguments);
[VB.NET] 
' Create the Function Arguments object.
Dim rasterFunctionArguments As IStretchFunctionArguments
rasterFunctionArguments = New StretchFunctionArgumentsClass()
' Set the stretch type (Minimum Maximum in this case).
rasterFunctionArguments.StretchType = esriRasterStretchType.esriRasterStretchMinimumMaximum
' The input data can be of type IRasterDataset, IRasterBand, or IRaster.
rasterFunctionArguments.Raster = inputData

' Create the Raster Function object.
Dim rasterFunction As IRasterFunction
rasterFunction = New StretchFunction()
' 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\StretchFunction.afr"
functionRasterDataset.FullName = functionRasterDatasetName
' Initialize the new Function Raster Dataset with the Raster Function and its arguments.
functionRasterDataset.Init(rasterFunction, rasterFunctionArguments)





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):
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