About creating a predefined geographic coordinate system
The ISpatialReferenceFactory interface provides access for creating a geographic coordinate system (GCS) in ArcGIS. You can return a single GCS with ISpatialReferenceFactory.CreateGeographicCoordinateSystem. Lists of the supported GCS are available in the esriSRGeoCSType, esriSRGeoCS2Type, and esriSRGeoCS3Type enumerations.
See the following code example:
[C#] private void CreateGeographicCoordinateSystem()
{
// Set up the SpatialReferenceEnvironment.
// SpatialReferenceEnvironment is a singleton object and needs to use the Activator class.
Type t=Type.GetTypeFromProgID("esriGeometry.SpatialReferenceEnvironment");
System.Object obj=Activator.CreateInstance(t);
ISpatialReferenceFactory srFact=obj as ISpatialReferenceFactory;
// Use the enumeration to create an instance of the predefined object.
IGeographicCoordinateSystem geographicCS =
srFact.CreateGeographicCoordinateSystem((int)
esriSRGeoCSType.esriSRGeoCS_NAD1983);
}
Private Sub CreateGeographicReferenceSystem()
' Set up the SpatialReferenceEnvironment.
' SpatialReferenceEnvironment is a singleton object and needs to use the Activator class.
Dim t As Type=Type.GetTypeFromProgID("esriGeometry.SpatialReferenceEnvironment")
Dim obj As System.Object=Activator.CreateInstance(t)
Dim srFact As ESRI.ArcGIS.Geometry.ISpatialReferenceFactory=obj
' Use the enumeration to create an instance of the predefined object.
Dim geographicCS As IGeographicCoordinateSystem=srFact.CreateGeographicCoordinateSystem(esriSRGeoCSType.esriSRGeoCS_NAD1983)
End Sub
See Also:
Creating a custom geographic coordinate systemTo use the code in this topic, reference the following assemblies in your Visual Studio project. In the code files, you will need using (C#) or Imports (VB .NET) directives for the corresponding namespaces (given in parenthesis below if different from the assembly name):
| Development licensing | Deployment licensing |
|---|---|
| Engine Developer Kit | Engine |
| ArcGIS Desktop Advanced | ArcGIS Desktop Advanced |
| ArcGIS Desktop Standard | ArcGIS Desktop Standard |
| ArcGIS Desktop Basic | ArcGIS Desktop Basic |