IExtractionOp Interface

Provides access to members that control the extraction operations. Note: the IExtractionOp interface has been superseded byIExtractionOp2. Please consider using the more recent version.

Product Availability

Members

	Name	Description
	Attribute	Extracts the cells of a raster based on a logical query.
	Circle	Extracts the cells of a raster based on a circle.
	Points	Extracts the cells of a raster based on points.
	Polygon	Extracts the cells of a raster based on a polygon.
	Raster	Extracts the cells of a raster whose corresponding cells in the mask raster have valid value.
	Rectangle	Extracts the cells of a raster based on a rectangle.
	Sample	Extracts the cells of a raster based on a sample.

CoClasses that implement IExtractionOp

Remarks

Spatial Analyst methods do not maintain colormaps in the output raster, therefore you can expect a loss of the color map when using methods of iExtractionOp.  This happens during analysis where a new raster is being created and the input color map information is not carried over to the result. However, you can obtain and alter a raster dataset’s color map.

Assuming that pRasterDataset (IRasterDatset) and pColorMap (iRasterColorMap) have been created, the following code snippet applies a color map from one raster dataset to another.

'Get color map from Raster
Dim pColorMap As IRasterColormapSet
pColorMap =  AccessRasterColorMap(pRasterDataSet01)

'Alter color map of raster02 to match raster01
Dim pRasterDatasetEdit As IRasterDatasetEdit
Set pRasterDatasetEdit=RasterDataSet02

pRasterDatasetEdit.AlterColormap pColorMap

Click on the following link to learn more about working with Raster Data:  DataSourcesRaster Library Overview.

• Read the Working with ArcGIS Spatial Analyst objects technical document for general information on implementing Spatial Analyst operations.

.NET Snippets