Grid2DSampleDimension creation does a full scan of a coverage (float32 data)
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Key: GEOT-1737
URL: http://jira.codehaus.org/browse/GEOT-1737
Project: GeoTools
Issue Type: Improvement
Components: core coverage
Reporter: Daniele Romagnoli
Assignee: Martin Desruisseaux
Attachments: a.tiff
GT-2.4
The creation of a Grid2DSampleDimension for a Coverage containing floating data
does the full coverage scan in order to determine the range of geophysics
values to build a category.
This may kill the machine when working with big coverages (WxH iterations scan
to find min and max on a WxH float array, where W and H are the image Size).
Here below, a standalone testcase to debug the Grid2DSampleDimension creation
where no sampleDimensions, sources and properties have been provided to the
GridCoverageFactory.
In attachment, the datasample for test.
/**
*
*/
package org.geotools.coverage;
import java.io.File;
import javax.imageio.ImageIO;
import javax.media.jai.PlanarImage;
import junit.framework.TestCase;
import org.geotools.coverage.grid.GeneralGridRange;
import org.geotools.coverage.grid.GridCoverage2D;
import org.geotools.coverage.grid.GridGeometry2D;
import org.geotools.geometry.GeneralEnvelope;
/**
* @author Daniele
*/
public class GridSampleDimensionBugTest extends TestCase {
private PlanarImage image;
/**
* @param name
*/
public GridSampleDimensionBugTest(String name) {
super(name);
}
/**
* @see junit.framework.TestCase#setUp()
*/
protected void setUp() throws Exception {
image=PlanarImage.wrapRenderedImage(ImageIO.read(new
File("c:\\a.tiff")));
super.setUp();
}
/**
* @see junit.framework.TestCase#tearDown()
*/
protected void tearDown() throws Exception {
super.tearDown();
}
public void test(){
final GridGeometry2D gg= new GridGeometry2D(new
GeneralGridRange(image.getBounds()), new GeneralEnvelope(new double[]{0,0},new
double[]{20,20}));
final GridCoverage2D
gc=FactoryFinder.getGridCoverageFactory(null).create("sample", image, gg, null,
null,null);
assertNotNull(gc);
}
}
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