/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2003-2008, 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;
import static org.junit.Assert.*;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.image.ColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.RenderedImage;
import java.awt.image.SampleModel;
import java.awt.image.renderable.ParameterBlock;
import java.io.File;
import java.util.Arrays;
import javax.imageio.ImageIO;
import javax.media.jai.Interpolation;
import javax.media.jai.JAI;
import javax.media.jai.PlanarImage;
import javax.media.jai.RasterFactory;
import javax.media.jai.TiledImage;
import org.geotools.TestData;
import org.geotools.coverage.CoverageFactoryFinder;
import org.geotools.coverage.grid.GeneralGridEnvelope;
import org.geotools.coverage.grid.GridCoverage2D;
import org.geotools.coverage.grid.GridCoverageFactory;
import org.geotools.coverage.grid.GridEnvelope2D;
import org.geotools.coverage.grid.GridGeometry2D;
import org.geotools.coverage.grid.ViewType;
import org.geotools.coverage.processing.operation.Extrema;
import org.geotools.factory.Hints;
import org.geotools.geometry.DirectPosition2D;
import org.geotools.geometry.Envelope2D;
import org.geotools.image.test.ImageAssert;
import org.geotools.metadata.iso.spatial.PixelTranslation;
import org.geotools.referencing.CRS;
import org.geotools.referencing.crs.DefaultProjectedCRS;
import org.geotools.referencing.cs.DefaultCartesianCS;
import org.geotools.referencing.operation.DefaultMathTransformFactory;
import org.geotools.referencing.operation.transform.ProjectiveTransform;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.opengis.coverage.grid.GridGeometry;
import org.opengis.geometry.DirectPosition;
import org.opengis.geometry.Envelope;
import org.opengis.parameter.ParameterValueGroup;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.NoSuchAuthorityCodeException;
import org.opengis.referencing.NoSuchIdentifierException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.crs.GeographicCRS;
import org.opengis.referencing.datum.Ellipsoid;
import org.opengis.referencing.datum.PixelInCell;
import org.opengis.referencing.operation.MathTransform;
/**
* Visual test of the "Resample" operation. A remote sensing image is projected from a fitted
* coordinate system to a geographic one.
*
*
*
* @source $URL$
* @version $Id$
* @author Rémi Eve (IRD)
* @author Martin Desruisseaux (IRD)
* @author Simone Giannecchini, GeoSolutions
*/
public final class ResampleTest extends GridProcessingTestBase {
private final static String GOOGLE_MERCATOR_WKT="PROJCS[\"WGS 84 / Pseudo-Mercator\","+
"GEOGCS[\"Popular Visualisation CRS\","+
"DATUM[\"Popular_Visualisation_Datum\","+
"SPHEROID[\"Popular Visualisation Sphere\",6378137,0,"+
"AUTHORITY[\"EPSG\",\"7059\"]],"+
"TOWGS84[0,0,0,0,0,0,0],"+
"AUTHORITY[\"EPSG\",\"6055\"]],"+
"PRIMEM[\"Greenwich\",0,"+
"AUTHORITY[\"EPSG\",\"8901\"]],"+
"UNIT[\"degree\",0.01745329251994328,"+
"AUTHORITY[\"EPSG\",\"9122\"]],"+
"AUTHORITY[\"EPSG\",\"4055\"]],"+
"UNIT[\"metre\",1,"+
"AUTHORITY[\"EPSG\",\"9001\"]],"+
"PROJECTION[\"Mercator_1SP\"],"+
"PARAMETER[\"central_meridian\",0],"+
"PARAMETER[\"scale_factor\",1],"+
"PARAMETER[\"false_easting\",0],"+
"PARAMETER[\"false_northing\",0],"+
"AUTHORITY[\"EPSG\",\"3785\"],"+
"AXIS[\"X\",EAST],"+
"AXIS[\"Y\",NORTH]]";
/**
* The source grid coverage, to be initialized by {@link #setUp}.
* Contains 8-bits indexed color model for a PNG image, with categories.
*/
private GridCoverage2D coverage;
/**
* An other source coverage initialized by {@link #setUp}.
* Contains indexed color model for a GIF image, without categories.
*/
private GridCoverage2D indexedCoverage;
/**
* An other source coverage initialized by {@link #setUp}.
* Contains indexed color model for a GIF image, without categories.
*/
private GridCoverage2D indexedCoverageWithTransparency;
/**
* An other source coverage initialized by {@link #setUp}.
* Contains float values.
*/
private GridCoverage2D floatCoverage;
/**
* An other source coverage initialized by {@link #setUp}.
* Contains ushort values.
*/
private GridCoverage2D ushortCoverage;
/**
* Set up common objects used for all tests.
*/
@Before
public void setUp() {
coverage = EXAMPLES.get(0);
indexedCoverage = EXAMPLES.get(2);
indexedCoverageWithTransparency = EXAMPLES.get(3);
floatCoverage = EXAMPLES.get(4);
ushortCoverage = EXAMPLES.get(5);
Hints.putSystemDefault(Hints.RESAMPLE_TOLERANCE, 0.333);
}
/**
* Returns a projected CRS for test purpose.
*/
private static CoordinateReferenceSystem getProjectedCRS(final GridCoverage2D coverage) {
try {
final GeographicCRS base = (GeographicCRS) coverage.getCoordinateReferenceSystem();
final Ellipsoid ellipsoid = base.getDatum().getEllipsoid();
final DefaultMathTransformFactory factory = new DefaultMathTransformFactory();
final ParameterValueGroup parameters = factory.getDefaultParameters("Oblique_Stereographic");
parameters.parameter("semi_major").setValue(ellipsoid.getSemiMajorAxis());
parameters.parameter("semi_minor").setValue(ellipsoid.getSemiMinorAxis());
parameters.parameter("central_meridian").setValue(5);
parameters.parameter("latitude_of_origin").setValue(-5);
final MathTransform mt;
try {
mt = factory.createParameterizedTransform(parameters);
} catch (FactoryException exception) {
fail(exception.getLocalizedMessage());
return null;
}
return new DefaultProjectedCRS("Stereographic", base, mt, DefaultCartesianCS.PROJECTED);
} catch (NoSuchIdentifierException exception) {
fail(exception.getLocalizedMessage());
return null;
}
}
/**
* Projects the specified coverage to the same CRS without hints.
* The result will be displayed in a window if {@link #SHOW} is set to {@code true}.
*
* @param coverage The coverage to project.
* @return The operation name which was applied on the image, or {@code null} if none.
*/
private static String showProjected(final GridCoverage2D coverage) {
return showProjected(coverage, coverage.getCoordinateReferenceSystem(), null, null, true);
}
/**
* Tests the "Resample" operation with an identity transform.
*
* @todo Investigate why we get a Lookup operation on the first coverage.
*/
@Test
public void testIdentity() {
assertEquals("Lookup", showProjected(coverage));
assertNull(showProjected(indexedCoverage));
assertNull(showProjected(indexedCoverageWithTransparency));
assertNull(showProjected(floatCoverage));
}
/**
* Tests the "Resample" operation with a "Crop" transform.
*/
@Test
public void testCrop() {
final GridGeometry2D g1,g2;
final MathTransform gridToCRS = null;
g1 = new GridGeometry2D(new GeneralGridEnvelope(new Rectangle(50,50,100,100), 2), gridToCRS, null);
g2 = new GridGeometry2D(new GeneralGridEnvelope(new Rectangle(50,50,200,200), 2), gridToCRS, null);
assertEquals("Crop", showProjected(coverage, null, g2, null, false));
assertEquals("Lookup", showProjected(coverage, null, g2, null, true ));
assertEquals("Crop", showProjected(indexedCoverage, null, g1, null, false));
assertEquals("Crop", showProjected(indexedCoverageWithTransparency, null, g1, null, false));
assertEquals("Crop", showProjected(floatCoverage, null, g1,
new Hints(Hints.COVERAGE_PROCESSING_VIEW, ViewType.PHOTOGRAPHIC), true));
}
/**
* Tests the "Resample" operation with a stereographic coordinate system.
*/
@Test
public void testStereographic() {
assertEquals("Warp", showProjected(coverage,getProjectedCRS(coverage), null, null, true));
}
/**
* Tests the "Resample" operation with a stereographic coordinate system.
* @throws FactoryException
* @throws NoSuchAuthorityCodeException
*/
@Test
public void testReproject() throws NoSuchAuthorityCodeException, FactoryException {
// do it again, make sure the image does not turn black since
GridCoverage2D coverage_ = project(ushortCoverage,CRS.parseWKT(GOOGLE_MERCATOR_WKT), null,"nearest", null, true);
// reproject the ushort and check that things did not go bad, that is it turned black
coverage_=(GridCoverage2D) Operations.DEFAULT.extrema(coverage_);
Object minimums = coverage_.getProperty(Extrema.GT_SYNTHETIC_PROPERTY_MINIMUM);
Assert.assertTrue(minimums instanceof double[]) ;
final double[] mins=(double[]) minimums;
Object maximums = coverage_.getProperty(Extrema.GT_SYNTHETIC_PROPERTY_MAXIMUM);
Assert.assertTrue(maximums instanceof double[]) ;
final double[] max=(double[]) maximums;
boolean fail=true;
for(int i=0;i<mins.length;i++)
if(mins[i]!=max[i]&&max[i]>0)
fail=false;
Assert.assertFalse("Reprojection failed", fail);
//exception in case the target crs does not comply with the target gg crs
try{
// we supplied both crs and target gg in different crs, we get an exception backS
assertEquals("Warp", showProjected(coverage,CRS.parseWKT(GOOGLE_MERCATOR_WKT), coverage.getGridGeometry(), null, true));
Assert.assertTrue("We should not be allowed to set different crs for target crs and target gg", false);
}catch (Exception e) {
// ok!
}
}
/**
* Tests the "Resample" operation with a stereographic coordinate system.
*
* @throws FactoryException If the CRS can't not be created.
*/
@Test
public void testsNad83() throws FactoryException {
Hints.putSystemDefault(Hints.RESAMPLE_TOLERANCE, 0.0);
final Hints photo = new Hints(Hints.COVERAGE_PROCESSING_VIEW, ViewType.PHOTOGRAPHIC);
final CoordinateReferenceSystem crs = CRS.parseWKT(
"GEOGCS[\"NAD83\"," +
"DATUM[\"North_American_Datum_1983\"," +
"SPHEROID[\"GRS 1980\",6378137,298.257222101,AUTHORITY[\"EPSG\",\"7019\"]]," +
"TOWGS84[0,0,0,0,0,0,0],AUTHORITY[\"EPSG\",\"6269\"]]," +
"PRIMEM[\"Greenwich\",0, AUTHORITY[\"EPSG\",\"8901\"]]," +
"UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9108\"]]," +
"AXIS[\"Lat\",NORTH]," +
"AXIS[\"Long\",EAST]," +
"AUTHORITY[\"EPSG\",\"4269\"]]");
assertEquals("Warp", showProjected(indexedCoverage, crs, null, null, false));
assertEquals("Warp", showProjected(indexedCoverageWithTransparency, crs, null, null, false));
assertEquals("Warp", showProjected(floatCoverage, crs, null, photo, true));
}
@Test
public void testGoogleWorld() throws Exception {
File world = TestData.copy(this, "geotiff/world.tiff");
RenderedImage image = ImageIO.read(world);
final CoordinateReferenceSystem wgs84 = CRS.decode("EPSG:4326", true);
Envelope2D envelope = new Envelope2D(wgs84, -180, -90, 360, 180);
GridCoverage2D gcFullWorld = new GridCoverageFactory().create("world", image, envelope);
// crop, we cannot reproject it fully to the google projection
final Envelope2D cropEnvelope = new Envelope2D(wgs84, -180, -80, 360, 160);
GridCoverage2D gcCropWorld = (GridCoverage2D) Operations.DEFAULT.crop(gcFullWorld, cropEnvelope);
// resample
Hints.putSystemDefault(Hints.RESAMPLE_TOLERANCE, 0d);
GridCoverage2D gcResampled = (GridCoverage2D) Operations.DEFAULT.resample(gcCropWorld, CRS.decode("EPSG:3857"),
null, Interpolation.getInstance(Interpolation.INTERP_BILINEAR));
File expected = new File("src/test/resources/org/geotools/image/test-data/google-reproject.png");
// allow one row of difference
ImageAssert.assertEquals(expected, gcResampled.getRenderedImage(), 600);
}
@Test
public void testWarpCompareGoogleWorld() throws Exception {
File world = TestData.copy(this, "geotiff/world.tiff");
RenderedImage image = ImageIO.read(world);
final CoordinateReferenceSystem wgs84 = CRS.decode("EPSG:4326", true);
Envelope2D envelope = new Envelope2D(wgs84, -180, -90, 360, 180);
GridCoverage2D gcFullWorld = new GridCoverageFactory().create("world", image, envelope);
// crop, we cannot reproject it fully to the google projection
final Envelope2D cropEnvelope = new Envelope2D(wgs84, -180, -80, 360, 160);
GridCoverage2D gcCropWorld = (GridCoverage2D) Operations.DEFAULT.crop(gcFullWorld, cropEnvelope);
// resample with approximation
Hints.putSystemDefault(Hints.RESAMPLE_TOLERANCE, 0.333d);
GridCoverage2D gcResampledApprox = (GridCoverage2D) Operations.DEFAULT.resample(gcCropWorld, CRS.decode("EPSG:3857"),
null, Interpolation.getInstance(Interpolation.INTERP_BILINEAR));
Hints.putSystemDefault(Hints.RESAMPLE_TOLERANCE, 0d);
GridCoverage2D gcResampledAccurate = (GridCoverage2D) Operations.DEFAULT.resample(gcCropWorld, CRS.decode("EPSG:3857"),
null, Interpolation.getInstance(Interpolation.INTERP_BILINEAR));
// allow one row of difference
ImageAssert.assertEquals(gcResampledAccurate.getRenderedImage(), gcResampledApprox.getRenderedImage(), 600);
}
/**
* Tests the "Resample" operation with an "Affine" transform.
*/
@Test
public void testAffine() {
final Hints photo = new Hints(Hints.COVERAGE_PROCESSING_VIEW, ViewType.PHOTOGRAPHIC);
showTranslated(coverage, null, true, "Lookup", "Affine");
showTranslated(indexedCoverage, null, true, "Lookup", "Affine");
showTranslated(indexedCoverageWithTransparency, null, false, "Lookup", "Affine");
showTranslated(floatCoverage,
photo, false, "org.geotools.SampleTranscode", "org.geotools.SampleTranscode");
}
/**
* Tests <var>X</var>,<var>Y</var> translation in the {@link GridGeometry} after
* a "Resample" operation.
*
* @throws NoninvertibleTransformException If a "grid to CRS" transform is not invertible.
*/
@Test
public void testTranslation() throws NoninvertibleTransformException {
doTranslation(coverage);
doTranslation(indexedCoverage);
doTranslation(indexedCoverageWithTransparency);
}
/**
* Tests that flipping axis on a coverage whose origin is not (0,0) works as expected
*/
@Test
public void testFlipTranslated() throws Exception {
// build a translated image
SampleModel sm = RasterFactory.createPixelInterleavedSampleModel(DataBuffer.TYPE_BYTE, 256, 256, 3);
ColorModel cm = PlanarImage.createColorModel(sm);
TiledImage ti = new TiledImage(-10, -10, 5, 5, 0, 0, sm, cm);
Graphics2D g = ti.createGraphics();
g.setColor(Color.GREEN);
g.fillRect(-10, -10, 5, 5);
g.dispose();
// build a coverage around it
CoordinateReferenceSystem wgs84LatLon = CRS.decode("EPSG:4326");
final GridCoverageFactory factory = CoverageFactoryFinder.getGridCoverageFactory(null);
GridCoverage2D coverage = factory.create("translated", ti, new Envelope2D(wgs84LatLon, 3, 5, 6, 8));
// verify we're good
int[] pixel = new int[3];
coverage.evaluate((DirectPosition) new DirectPosition2D(4, 6), pixel);
assertEquals(0, pixel[0]);
assertEquals(255, pixel[1]);
assertEquals(0, pixel[2]);
// now reproject flipping the axis
CoordinateReferenceSystem wgs84LonLat = CRS.decode("EPSG:4326", true);
GridGeometry gg = new GridGeometry2D(new GridEnvelope2D(-10, -10, 5, 5), (Envelope) new Envelope2D(wgs84LonLat, 5, 3, 8, 6));
GridCoverage2D flipped = (GridCoverage2D) Operations.DEFAULT.resample(coverage, wgs84LonLat,
gg, Interpolation.getInstance(Interpolation.INTERP_NEAREST));
// before the fix the pixel would have been black
flipped.evaluate((DirectPosition) new DirectPosition2D(6, 4), pixel);
assertEquals(0, pixel[0]);
assertEquals(255, pixel[1]);
assertEquals(0, pixel[2]);
}
/**
* Performs a translation using the "Resample" operation.
*
* @param grid the {@link GridCoverage2D} to apply the translation on.
* @throws NoninvertibleTransformException If a "grid to CRS" transform is not invertible.
*/
private void doTranslation(GridCoverage2D grid) throws NoninvertibleTransformException {
final int transX = -253;
final int transY = -456;
final double scaleX = 0.04;
final double scaleY = -0.04;
final ParameterBlock block = new ParameterBlock().
addSource(grid.getRenderedImage()).
add((float) transX).
add((float) transY);
RenderedImage image = JAI.create("Translate", block);
assertEquals("Incorrect X translation", transX, image.getMinX());
assertEquals("Incorrect Y translation", transY, image.getMinY());
/*
* Create a grid coverage from the translated image but with the same envelope.
* Consequently, the 'gridToCoordinateSystem' should be translated by the same
* amount, with the opposite sign.
*/
AffineTransform expected = getAffineTransform(grid);
assertNotNull(expected);
expected = new AffineTransform(expected); // Get a mutable instance.
final GridCoverageFactory factory = CoverageFactoryFinder.getGridCoverageFactory(null);
grid = factory.create("Translated",image, grid.getEnvelope(), grid.getSampleDimensions(),new GridCoverage2D[]{grid}, grid.getProperties());
expected.translate(-transX, -transY);
assertTransformEquals(expected, getAffineTransform(grid));
/*
* Apply the "Resample" operation with a specific 'gridToCoordinateSystem' transform.
* The envelope is left unchanged. The "Resample" operation should compute automatically
* new image bounds.
*/
final AffineTransform at = AffineTransform.getScaleInstance(scaleX, scaleY);
final MathTransform tr = ProjectiveTransform.create(at);
//account for the half pixel correction between the two spaces since we are talking raster here but the resample will talk model!
final MathTransform correctedTransform = PixelTranslation.translate(tr, PixelInCell.CELL_CORNER,PixelInCell.CELL_CENTER);
final GridGeometry2D geometry = new GridGeometry2D(null, correctedTransform, null);
final GridCoverage2D newGrid = (GridCoverage2D) Operations.DEFAULT.resample(grid,grid.getCoordinateReferenceSystem(), geometry, null);
assertEquals(correctedTransform, getAffineTransform(newGrid));
image = newGrid.getRenderedImage();
expected.preConcatenate(at.createInverse());
final Point point = new Point(transX, transY);
assertSame(point, expected.transform(point, point)); // Round toward neareast integer
}
}