ArcObjects Library Reference (Geometry)

Projection CoClass

Creates a map projection.

Product Availability

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

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
IClone (esriSystem)	Provides access to members that control cloning of objects.
IESRISpatialReference	Provides access to members that control the import/export operations components of a spatial reference system. This interface has been deprecated and IESRISpatialReferenceGEN should be used.
IESRISpatialReferenceGEN	Provides access to members that generate well known string (WKS) representations of spatial reference objects. IESRISpatialReference has been deprecated and IESRISpatialReferenceGEN should be used.
IESRISpatialReferenceGEN2	Provides access to members that generate well known string representations for spatial reference objects. The strings include authority metadata.
IPersist	Defines the single method GetClassID, which is designed to supply the CLSID of an object that can be stored persistently in the system. IPersist is the base interface for three other interfaces: IPersistStorage, IPersistStream, and IPersistFile.
IPersistStream (esriSystem)
IProjection	Provides access to members that control the properties of all map projections.
IProjectionGEN	OLE compatibility for providing access to members that control the properties of all map projections.
ISpatialReferenceAuthority	Provides access to the authority-related metadata for a spatial reference object.
ISpatialReferenceInfo	Provides access to members that control the properties common to all components of a spatial reference system.
ISupportErrorInfo	Indicates whether a specific interface can return Automation error objects.

Remarks

A Projection object encapsulates the mathematics needed to convert geographic coordinates between two different coordinate systems. A projection is a component of a projected coordinate system and is not usually used directly. Rather, a projected cooordinate system is defined and used to project cooordinates.