/* * GeoTools - The Open Source Java GIS Toolkit * http://geotools.org * * (C) 2005-2008, Open Source Geospatial Foundation (OSGeo) * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. */ package org.geotools.coverage.processing.operation; import java.awt.Shape; import java.awt.image.RenderedImage; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.logging.Logger; import javax.media.jai.JAI; import javax.media.jai.RenderedOp; import javax.media.jai.operator.ExtremaDescriptor; import org.geotools.coverage.grid.GridCoverage2D; import org.geotools.coverage.processing.AbstractStatisticsOperationJAI; import org.geotools.util.logging.Logging; import org.opengis.coverage.processing.OperationNotFoundException; import org.opengis.parameter.ParameterValueGroup; import org.opengis.referencing.crs.CoordinateReferenceSystem; import org.opengis.referencing.operation.MathTransform; import org.opengis.util.InternationalString; /** * This operation simply wraps JAI Extrema operations described by * {@link ExtremaDescriptor} inside a GeoTools operation in order to make it * spatial-aware. * *
* For the moment this is a very simple wrap. Plans on the 2.4 and successive * versions of this operation are to add the ability to use spatial ROIs and * to specific Spatial subsampling. As of now, ROI has to be a Java2D * {@link Shape} subclass and the parameters to control x and y subsamplings got * to be Integer, which means pixel-aware. * *
* For more information on how the underlying {@link JAI} operators works you * can have a look here: ExtremaDescriptor * *
* How to use this operation Here is a very simple example on
* how to use this operation in order to the minimum and maximum of the source
* coverage.
*
*
* final OperationJAI op=new OperationJAI("Extrema");
* ParameterValueGroup params = op.getParameters();
* params.parameter("Source").setValue(coverage);
* coverage=(GridCoverage2D) op.doOperation(params,null);
* System.out.println(((double[])coverage.getProperty("minimum"))[0]);
* System.out.println(((double[])coverage.getProperty("minimum"))[1]);
* System.out.println(((double[])coverage.getProperty("minimum"))[2]);
* System.out.println(((double[])coverage.getProperty("maximum"))[0]);
* System.out.println(((double[])coverage.getProperty("maximum"))[1]);
* System.out.println(((double[])coverage.getProperty("maximum"))[2]);
*
*
* @author Simone Giannecchini
* @since 2.4
*
*
*
*
* @source $URL$
*/
public class Extrema extends AbstractStatisticsOperationJAI {
/**
* Serial number for interoperability with different versions.
*/
private static final long serialVersionUID = 7731039381590398047L;
/** {@link Logger} for this class. */
public final static Logger LOGGER = Logging.getLogger("org.geotools.coverage.processing.operation");
/** {@link String} key for getting the minimum vector. */
public final static String GT_SYNTHETIC_PROPERTY_MINIMUM = "minimum";
/** {@link String} key for getting the maximum vector. */
public final static String GT_SYNTHETIC_PROPERTY_MAXIMUM = "maximum";
/**Locations of min values. */
public final static String GT_SYNTHETIC_PROPERTY_MIN_LOCATIONS="minLocations";
/**Locations of max values. */
public final static String GT_SYNTHETIC_PROPERTY_MAX_LOCATIONS="maxLocations";
/**
* Constructs a default {@code "Extrema"} operation.
*/
public Extrema() throws OperationNotFoundException {
super(getOperationDescriptor("Extrema"));
}
/**
* This operation MUST be performed on the geophysics data for this
* {@link GridCoverage2D}.
*
* @param parameters
* {@link ParameterValueGroup} that describes this operation
* @return always true.
*/
protected boolean computeOnGeophysicsValues(ParameterValueGroup parameters) {
return true;
}
/**
* Prepare the minimum and maximum properties for this extream operation.
*
*
* See ExtremaDescriptor
* for more info.
*
* @see OperationJAI#getProperties(RenderedImage, CoordinateReferenceSystem,
* InternationalString, MathTransform, GridCoverage2D[],
* org.geotools.coverage.processing.OperationJAI.Parameters),
*/
@SuppressWarnings("unchecked")
protected Map