How to identify pixel values using a raster object

Summary

This topic shows how to identify pixel values directly from a raster object.

Identifying pixel values on a raster

IRaster2.GetPixelValue can be used to retrieve a pixel value at a given row and column in a pixel space. To get the pixel value by giving x and y coordinates in a map space, use the following code:

[C#]


        public static void IdentifyPixelValue(IRaster raster, double xMap, double yMap)
{
    IRaster2 raster2 = (IRaster2)raster;

    //Get the column and row by giving x,y coordinates in a map space.
    int col = raster2.ToPixelColumn(xMap);
    int row = raster2.ToPixelRow(yMap);

    //Get the value at a given band.
    double pixelValue = raster2.GetPixelValue(0, col, row);
}

[VB.NET]


        Public Sub IdentifyPixelValue(ByVal raster As IRaster, ByVal xMap As Double, ByVal yMap As Double)
    
    Dim raster2 As IRaster2 = CType(raster, IRaster2)
    
    'Get the column and row by giving x,y coordinates in a map space.
    Dim col As Integer = raster2.ToPixelColumn(xMap)
    Dim row As Integer = raster2.ToPixelRow(yMap)
    
    'Get the value at a given band.
    Dim pixelValue As Double = CDbl(raster2.GetPixelValue(0, col, row))
    
End Sub

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):

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