/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2011, Open Source Geospatial Foundation (OSGeo)
* (C) 2003-2005, Open Geospatial Consortium Inc.
*
* All Rights Reserved. http://www.opengis.org/legal/
*/
package org.opengis.referencing.operation;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.annotation.UML;
import static org.opengis.annotation.Obligation.*;
import static org.opengis.annotation.Specification.*;
/**
* An operation on coordinates that does not include any change of Datum. The best-known
* example of a coordinate conversion is a map projection. The parameters describing
* coordinate conversions are defined rather than empirically derived.
* <p>
* Note that some conversions have no parameters.
*
*
* @source $URL: http://svn.osgeo.org/geotools/branches/2.7.x/modules/library/opengis/src/main/java/org/opengis/referencing/operation/Conversion.java $
* @version <A HREF="http://portal.opengeospatial.org/files/?artifact_id=6716">Abstract specification 2.0</A>
* @author Martin Desruisseaux (IRD)
* @since GeoAPI 1.0
*
* @see Transformation
*/
@UML(identifier="CC_Conversion", specification=ISO_19111)
public interface Conversion extends Operation {
/**
* Returns the source CRS. Conversions may have a source CRS that
* is not specified here, but through
* {@link org.opengis.referencing.crs.GeneralDerivedCRS#getBaseCRS} instead.
*
* @return The source CRS, or {@code null} if not available.
*/
@UML(identifier="sourceCRS", obligation=OPTIONAL, specification=ISO_19111)
CoordinateReferenceSystem getSourceCRS();
/**
* Returns the target CRS. {@linkplain Conversion Conversions} may have a target CRS
* that is not specified here, but through
* {@link org.opengis.referencing.crs.GeneralDerivedCRS} instead.
*
* @return The target CRS, or {@code null} if not available.
*/
@UML(identifier="targetCRS", obligation=OPTIONAL, specification=ISO_19111)
CoordinateReferenceSystem getTargetCRS();
/**
* This attribute is declared in {@link CoordinateOperation} but is not used in a conversion.
*
* @return Always {@code null}.
*/
@UML(identifier="operationVersion", obligation=CONDITIONAL, specification=ISO_19111)
String getOperationVersion();
}