GridCoverageUtil.java

/**
 * This file is hereby placed into the Public Domain. This means anyone is
 * free to do whatever they wish with this file.
 */
package mil.nga.giat.process.elasticsearch;

import java.awt.image.Raster;
import java.awt.image.RenderedImage;

import org.geotools.coverage.grid.GridCoverage2D;
import org.geotools.coverage.processing.CoverageProcessor;
import org.geotools.coverage.processing.Operations;
import org.geotools.geometry.GeneralEnvelope;
import org.opengis.geometry.Envelope;
import org.opengis.parameter.ParameterValueGroup;

public class GridCoverageUtil {

    public static GridCoverage2D scale(GridCoverage2D coverage, float width, float height) {
        final RenderedImage renderedImage = coverage.getRenderedImage();
        final Raster renderedGrid = renderedImage.getData();
        float yScale = width/renderedGrid.getWidth();
        float xScale = height/renderedGrid.getHeight();

        final Operations ops = new Operations(null);
        return (GridCoverage2D) ops.scale(coverage, xScale, yScale, 0, 0);
    }

    public static GridCoverage2D crop(GridCoverage2D coverage, Envelope envelope) {
        final CoverageProcessor processor = new CoverageProcessor();

        final ParameterValueGroup param = processor.getOperation("CoverageCrop").getParameters();

        final GeneralEnvelope crop = new GeneralEnvelope(envelope);
        param.parameter("Source").setValue( coverage );
        param.parameter("Envelope").setValue( crop );

        return (GridCoverage2D) processor.doOperation(param);
    }

}