ArcObjects Library Reference  (DataSourcesRaster)    

ApproximationXform CoClass

A transformation that approximates other transformations.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.


ApproximateXform is used to approximate a GeoDataXform to achieve a better performance and it is mainly used for those GeodataXforms that are computationally expensive, such as  CoordinateXform, AdjustXform, and etc.

ApproximateXform approximates its base GeodataXform by applying the true transformation only on a coarse mesh, and performing bilinear interpolation for between points.  ApproximateXform guarantees the approximation error does not exceed the specified tolerance.


Interfaces Description
IApproximationXform Provides access to members that control transformation approximation.
IClone (esriSystem) Provides access to members that control cloning of objects.
IDocumentVersionSupportGEN (esriSystem) Provides access to extend the IObjectStream interface with methods to hande saving objects that did not exist in previous versions of the software.
IGeodataXform (esriGeoDatabase) Provides access to members that control geodata transformation.
IGeodataXformApproximation Provides access to members that control approximation for geodata transforms.
IPersistStream (esriSystem)
IXMLVersionSupport (esriSystem) Provides access to members that help in serializing an object to different namespaces (versions).