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ProjectiveTransformation2D Class (ArcObjects .NET 10.7 SDK)
 ArcObjects Help for .NET developers > ArcObjects Help for .NET developers > ArcObjects namespaces > Geometry > ESRI.ArcGIS.Geometry > Classes > P > ProjectiveTransformation2D Class
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# ProjectiveTransformation2DClass Class

A two dimensional projective transformation.

#### Product Availability

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

#### Description

The projective transformation requires a minimum of four points to define the transformation. The projective transformation is only used to transform coordinates digitized directly off high altitude aerial photography or aerial photographs of relatively flat terrain assuming that there is no systematic distortion in the air photos. The projective transformation uses eight parameters.

ProjectiveTransformation2D is defined by the matrix operations necessary for

X = (ax + by + c) / (gx + hy + 1)

Y = (dx + ey + f )/ (gx + hy + 1)

#### Supported Platforms

Windows, Solaris, Linux

#### Extended Error Information

Use the ISupportErrorInfo method InterfaceSupportsErrorInfo to determine if the object supports extended error information. If the object supports extended error info, VC++ developers should use the OLE/COM IErrorInfo interface to access the ErrorInfo object. Visual Basic developers should use the global error object Err to retrieve this extended error information.

#### Interfaces

Interfaces Description
IProjectiveTransformation2DGEN Provides access to members that define and manipulate projective transformations. IProjectiveTransformation2DGEN is generic version of IProjectiveTransformation.
ISupportErrorInfo (esriSystem)
ITransformation Provides access to members that apply a function (or its inverse) to a set of points or measures. The suffix of each method indicates the type of parameters operated on.
ITransformationGEN Provides access to members that apply a function (or its inverse) to a set of points or measures. The suffix of each method indicates the type of parameters operated on. ITransformationGEN is generic version of ITransformation.