/// <summary>
/// create a crazy coordinate system
/// </summary>
/// <returns></returns>
private ISpatialReference CreateGeographicSpatialReference()
{
ISpatialReferenceFactory spatialRefFatcory = new SpatialReferenceEnvironmentClass();
IGeographicCoordinateSystem geoCoordSys;
geoCoordSys = spatialRefFatcory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984);
//assign a user defined datum to the SR (just for the test)
IDatum datum = new DatumClass();
IDatumEdit datumEdit = (IDatumEdit)datum;
ISpheroid spheroid = spatialRefFatcory.CreateSpheroid((int)esriSRSpheroidType.esriSRSpheroid_Clarke1880);
datumEdit.DefineEx("MyDatum", "My Datum", "MDTM", "", spheroid);
IPrimeMeridian primeMeridian = spatialRefFatcory.CreatePrimeMeridian((int)esriSRPrimeMType.esriSRPrimeM_Greenwich);
IAngularUnit angularUnits = spatialRefFatcory.CreateUnit((int)esriSRUnitType.esriSRUnit_Degree) as IAngularUnit;
IGeographicCoordinateSystemEdit geoCoordSysEdit = (IGeographicCoordinateSystemEdit)geoCoordSys;
geoCoordSysEdit.DefineEx("MyGeoCoordSys", "MyGeoCoordSys", "MGCS", "", "", datum, primeMeridian, angularUnits);
geoCoordSys.SetFalseOriginAndUnits(-180.0, -180.0, 5000000.0);
geoCoordSys.SetZFalseOriginAndUnits(0.0, 100000.0);
geoCoordSys.SetMFalseOriginAndUnits(0.0, 100000.0);
return(geoCoordSys as ISpatialReference);
}
private void CreateGeographicCoordinateSystem()
{
ISpatialReferenceFactory3 spatialReferenceFactory = new SpatialReferenceEnvironmentClass();
IDatum datum = spatialReferenceFactory.CreateDatum((int)esriSRDatumType.esriSRDatum_OSGB1936);
IPrimeMeridian primeMeridian = spatialReferenceFactory.CreatePrimeMeridian((int)esriSRPrimeMType.esriSRPrimeM_Greenwich);
IUnit unit = spatialReferenceFactory.CreateUnit((int)esriSRUnitType.esriSRUnit_Degree);
IGeographicCoordinateSystemEdit geographicCoordinateSystemEdit = new GeographicCoordinateSystemClass();
object name = "UserDefined Geographic Coordinate System";
object alias = "UserDefined GCS";
object abbreviation = "UserDefined";
object remarks = "User Defined Geographic Coordinate System based on OSGB1936";
object usage = "Suitable for the UK";
object datumObject = datum as object;
object primeMeridianObject = primeMeridian as object;
object unitObject = unit as object;
geographicCoordinateSystemEdit.Define(ref name, ref alias, ref abbreviation, ref remarks, ref usage, ref datumObject, ref primeMeridianObject, ref unitObject);
IGeographicCoordinateSystem userDefinedGeographicCoordinateSystem = geographicCoordinateSystemEdit as IGeographicCoordinateSystem;
m_map.SpatialReference = userDefinedGeographicCoordinateSystem;
m_activeView.Refresh();
MessageBox.Show("已将当前坐标系统转换为自定义GeographicCoordinateSystem！");
}
/// <summary>
/// create a crazy coordinate system
/// </summary>
/// <returns></returns>
private ISpatialReference CreateGeographicSpatialReference()
{
ISpatialReferenceFactory spatialRefFatcory = new SpatialReferenceEnvironmentClass();
IGeographicCoordinateSystem geoCoordSys;
geoCoordSys = spatialRefFatcory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984);
//assign a user defined datum to the SR (just for the test)
IDatum datum = new DatumClass();
IDatumEdit datumEdit = (IDatumEdit)datum;
ISpheroid spheroid = spatialRefFatcory.CreateSpheroid((int)esriSRSpheroidType.esriSRSpheroid_Clarke1880);
datumEdit.DefineEx("MyDatum", "My Datum", "MDTM", "", spheroid);
IPrimeMeridian primeMeridian = spatialRefFatcory.CreatePrimeMeridian((int)esriSRPrimeMType.esriSRPrimeM_Greenwich);
IAngularUnit angularUnits = spatialRefFatcory.CreateUnit((int)esriSRUnitType.esriSRUnit_Degree) as IAngularUnit;
IGeographicCoordinateSystemEdit geoCoordSysEdit = (IGeographicCoordinateSystemEdit)geoCoordSys;
geoCoordSysEdit.DefineEx("MyGeoCoordSys", "MyGeoCoordSys", "MGCS", "", "", datum, primeMeridian, angularUnits);
geoCoordSys.SetFalseOriginAndUnits(-180.0, -180.0, 5000000.0);
geoCoordSys.SetZFalseOriginAndUnits(0.0, 100000.0);
geoCoordSys.SetMFalseOriginAndUnits(0.0, 100000.0);
return geoCoordSys as ISpatialReference;
}