ilog.views.maps.srs.wkt

Class IlvWKTDatumFactory

java.lang.Object

ilog.views.maps.srs.wkt.IlvWKTDatumFactory

public class IlvWKTDatumFactory
extends Object

The factory used to create datums from WKT names.
This factory is used by the IlvWKTCoordinateSystemFactory to instantiate a datum from a WKT string.

Since:

JViews 5.0

See Also:

IlvWKTCoordinateSystemFactory

Constructor Summary

Constructors

Constructor and Description
IlvWKTDatumFactory() Creates a new default datum factory with a default horizontal datum collection.
IlvWKTDatumFactory(IlvHorizontalDatumCollection datumCollection) Creates a new default datum factory with the specified horizontal datum collection.

Method Summary

Modifier and Type	Method and Description
IlvHorizontalDatum	fromName(String name, IlvEllipsoid ellipsoid) Returns the datum from the specified name.
String	toWKT(IlvEllipsoid e) Returns the WKT representation of the specified ellipsoid.
String	toWKT(IlvHorizontalDatum datum) Returns the WKT representation of the specified datum.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IlvWKTDatumFactory

public IlvWKTDatumFactory()

Creates a new default datum factory with a default horizontal datum collection.

IlvWKTDatumFactory

public IlvWKTDatumFactory(IlvHorizontalDatumCollection datumCollection)

Creates a new default datum factory with the specified horizontal datum collection.

Parameters:

datumCollection - The datum collection to use.

Method Detail

fromName

public IlvHorizontalDatum fromName(String name,
                                   IlvEllipsoid ellipsoid)

Returns the datum from the specified name.
The default implementation first tries to find a datum with the same name, using IlvHorizontalShiftDatum.GetRegisteredDatum(name), then returns a new instance of IlvHorizontalShiftDatum with the same parameters as the registered datum, but with the ellipsoid specified.
Note : This method is not called by the IlvWKTCoordinateSystemFactory when the datum transformation parameters are defined in the WKT string.

Parameters:

name - The name of the datum to create.

ellipsoid - The ellipsoid of reference for the datum.

Returns:

The corresponding horizontal datum or null if the datum is unknown.

See Also:

IlvHorizontalDatum

toWKT

public String toWKT(IlvHorizontalDatum datum)

Returns the WKT representation of the specified datum.
The WKT representation of a datum is specified by a string defined by the following rules:

 <datum> = DATUM["<name>", <spheroid> {, <to wgs84> } {, <authority> }]
 <spheroid> = SPHEROID["<name>", <semi-major axis>, <inverse flattening>
                       {, <authority>}]
 <to wgs84> = TOWGS84[<dx>,<dy>,<dz>,<ex>,<ey>,<ez>,<ppm>]
 <authority> = AUTHORITY["<name>", "<code>"]
 

The representation of the null datum (no datum) is DATUM ["", SPHEROID["None", 0.000000, 0.000000]].
See the OpenGIS Consortium Implementation Specification : Coordinate Transformation Services, Open GIS Project Document 01-009 for more information.

See Also:

IlvHorizontalDatum

toWKT

public String toWKT(IlvEllipsoid e)

Returns the WKT representation of the specified ellipsoid.
The WKT representation of a datum is specified by the following string:

 <spheroid> = SPHEROID["<name>", <semi-major axis>, <inverse flattening>
                       {, <authority>}]
 <authority> = AUTHORITY["<name>", "<code>"]
 

The representation of the null ellipsoid (no ellipsoid) is SPHEROID["None", 0.000000, 0.000000].
See the OpenGIS Consortium Implementation Specification : Coordinate Transformation Services, Open GIS Project Document 01-009 for more information.

See Also:

IlvEllipsoid