IGeographicCoordinateSystem Interface

Provides access to members that control access to all properties of geographic coordinate systems.

Description

A geographic coordinate system is defined (at minimum) by a name, an angular unit of measure, a horizontal datum, and a prime meridian.

Members

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

IGeographicCoordinateSystem.CoordinateUnit Property

The angular unit of this geographic coordinate system.

Public ReadOnly Property CoordinateUnit As IAngularUnit

public IAngularUnit CoordinateUnit {get;}

private void PrintCoordinateUnit()

    {

        // use activator class with SpatialReferenceEnvironment singleton

        Type factoryType = Type.GetTypeFromProgID("esriGeometry.SpatialReferenceEnvironment");

        System.Object obj = Activator.CreateInstance(factoryType);

        ISpatialReferenceFactory spatialReferenceFactory = obj as ISpatialReferenceFactory;

        IGeographicCoordinateSystem geographicCoordinateSystem = spatialReferenceFactory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984);

        IAngularUnit coordinateUnit = geographicCoordinateSystem.CoordinateUnit;

        System.Windows.Forms.MessageBox.Show(coordinateUnit.Name);

    }

IGeographicCoordinateSystem.Datum Property

The horizontal datum of this geographic coordinate system.

Public ReadOnly Property Datum As IDatum

public IDatum Datum {get;}

Description

Returns the vertical or horizontal datum of the vertical coordinate system as IHVDatum. QI with IVerticalDatum or IDatum. A vertical datum means that the VCS is gravity-related. A (horizontal) datum means that the VCS is ellipsoid/spheroid-based.

IGeographicCoordinateSystem.PrimeMeridian Property

The prime meridian of this geographic coordinate system.

Public ReadOnly Property PrimeMeridian As IPrimeMeridian

public IPrimeMeridian PrimeMeridian {get;}

private void PrintPrimeMeridianFromGCS()

    {

        // use activator class with SpatialReferenceEnvironment singleton

        Type factoryType = Type.GetTypeFromProgID("esriGeometry.SpatialReferenceEnvironment");

        System.Object obj = Activator.CreateInstance(factoryType);

        ISpatialReferenceFactory spatialReferenceFactory = obj as ISpatialReferenceFactory;

        IGeographicCoordinateSystem geographicCoordinateSystem = spatialReferenceFactory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984);

        IPrimeMeridian primeMeridian = geographicCoordinateSystem.PrimeMeridian;

        System.Windows.Forms.MessageBox.Show(primeMeridian.Name);

    }

IGeographicCoordinateSystem.Usage Property

The usage notes of this geographic coordinate system.

Public ReadOnly Property Usage As String

public string Usage {get;}

Description

private void GetUsage(IGeographicCoordinateSystem geographicCoordinateSystem){String usage = geographicCoordinateSystem.Usage;System.Windows.Forms.MessageBox.Show(usage);}

Inherited Interfaces

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

Classes that implement IGeographicCoordinateSystem

Classes	Description
GeographicCoordinateSystem	Creates a geographic coordinate system.