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Proj4J is a Java library to transform point coordinates from one geographic coordinate system to another, including datum transformations.

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package org.osgeo.proj4j;

import org.osgeo.proj4j.datum.Datum;

/**
 * Creates {@link CoordinateTransform}s
 * from source and target {@link CoordinateReferenceSystem}s.
 * 
 * @author mbdavis
 *
 */
public class CoordinateTransformFactory 
{
	/**
	 * Creates a new factory.
	 *
	 */
	public CoordinateTransformFactory()
	{
		
	}
	
	/**
	 * Creates a transformation from a source CRS to a target CRS,
	 * following the logic in PROJ.4.
	 * The transformation may include any or all of inverse projection, datum transformation,
	 * and reprojection, depending on the nature of the coordinate reference systems 
	 * provided.
	 *  
	 * @param sourceCRS the source CoordinateReferenceSystem
	 * @param targetCRS the target CoordinateReferenceSystem
	 * @return a tranformation from the source CRS to the target CRS
	 */
	public CoordinateTransform createTransform(CoordinateReferenceSystem sourceCRS, CoordinateReferenceSystem targetCRS)
	{
		return new BasicCoordinateTransform(sourceCRS, targetCRS);
	}
}