This document is archived and information here might be outdated.  Recommended version.


ISpatialReference Interface (ArcObjects .NET 10.7 SDK)
ArcObjects Help for .NET developers > ArcObjects Help for .NET developers > ArcObjects namespaces > Geometry > ESRI.ArcGIS.Geometry > Interfaces > IS > ISpatialReference Interface
ArcGIS Developer Help

ISpatialReference Interface

Provides access to members that control a SpatialReference. Note: the ISpatialReference interface has been superseded by ISpatialReference3. Please consider using the more recent version.

Product Availability

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

Description

The spatial reference is not defined when creating a new instance of a geometry. It is the developer's responsibility to define a spatial reference that makes sense for the geometry and for the operation. To achieve precise and predictable results using the geometry library, it is essential that the spatial reference of geometries within a workflow is well defined. When performing a spatial operation using two or more geometries, for example an intersection, the coordinate systems of the two geometries must be equal. If the coordinate systems of the geometries are different or undefined, the operation could produce unexpected results.

Members

Name Description
Read-only property Abbreviation The abbreviated name of this spatial reference component.
Read-only property Alias The alias of this spatial reference component.
Method Changed Notify this object that some of its parts have changed (parameter values, z unit, etc.).
Read-only property FactoryCode The factory code (WKID) of the spatial reference.
Method GetDomain The XY domain extent.
Method GetFalseOriginAndUnits Get the false origin and units.
Method GetMDomain The measure domain extent.
Method GetMFalseOriginAndUnits Get the measure false origin and units.
Method GetZDomain The Z domain extent.
Method GetZFalseOriginAndUnits Get the Z false origin and units.
Method HasMPrecision Returns true when m-value precision information has been defined.
Method HasXYPrecision Returns true when (x,y) precision information has been defined.
Method HasZPrecision Returns true when z-value precision information has been defined.
Method IsPrecisionEqual Returns TRUE when the precision information for the two spatial references is the same.
Read-only property Name The name of this spatial reference component.
Read-only property PrecisionExImpl An opaque reference to the precision information (including z/m awareness) implementation for this spatial reference.
Read-only property PrecisionImpl An opaque reference to the precision information implementation for this spatial reference.
Read-only property Remarks The comment string of this spatial reference component.
Method SetDomain The XY domain extent.
Method SetFalseOriginAndUnits Set the false origin and units.
Method SetMDomain The measure domain extent.
Method SetMFalseOriginAndUnits Set the measure false origin and units.
Method SetZDomain The Z domain extent.
Method SetZFalseOriginAndUnits Set the Z false origin and units.
Read-only property SpatialReferenceImpl SpatialReferenceImpl.
Read/write property ZCoordinateUnit The unit for the Z coordinate.

Inherited Interfaces

Interfaces Description
ISpatialReferenceInfo Provides access to members that control the properties common to all components of a spatial reference system.

Classes that implement ISpatialReference

Classes Description
GeographicCoordinateSystem Creates a geographic coordinate system.
ProjectedCoordinateSystem Creates a projected coordinate system.
UnknownCoordinateSystem Creates an unknown coordinate system.
[C#]

The following code demonstrates how to compare two spatial references.  There are two ways shown in the example one using IClone and the other using ICompareSpatialReferences and the IsEqualNoVCS method

 

        public static bool CompareSpatialRefs(ISpatialReference sourceSR, ISpatialReference targetSR)
        {
            IClone sClone = sourceSR as IClone;
            IClone tClone = targetSR as IClone;

            // first level test compares the coordinate system component  
            if (!sClone.IsEqual(tClone))
                return false;
            
            return true;
        }

 

.NET Samples

Move a graphic along a path in ArcMap Create camera flyby from path Clonable object Clonable object Find the closest intersection from a point Custom map selection commands Create a Mosaic dataset Create a raster catalog using the geoprocessor Create a custom raster type Create a custom raster type from the ground up for DMCII data Create a custom raster type from the ground up for DMCII data Creating a toolbar of globe tools Creating a toolbar of globe tools Creating a toolbar of globe tools Creating a toolbar of globe tools RSS weather GraphicTracker RSS weather layer RSS weather layer Implementing a schematic digitizing tool Implementing a schematic layout algorithm and its layout property page Reducing schematic nodes and computing a cumulative attribute via a schematic rule StreetMap routing Triangle graphic element