Examples of org.geotools.coverage.grid.GridCoverage2D

org.geotools.coverage.grid.GridCoverage2D
Basic access to grid data values backed by a two-dimensional {@linkplain RenderedImage rendered image}. Each band in an image is represented as a {@linkplain GridSampleDimension sample dimension}.
Grid coverages are usually two-dimensional. However, {@linkplain #getEnvelope their envelope}may have more than two dimensions. For example, a remote sensing image may be valid only over some time range (the time of satellite pass over the observed area). Envelopes for such grid coverage can have three dimensions: the two usual ones (horizontal extent along x and y), and a third one for start time and end time (time extent along t). However, the {@linkplain GeneralGridRange grid range} for all extra-dimension musthave a {@linkplain GeneralGridRange#getLength size} not greater than 1. In other words, a{@code GridCoverage2D} can be a slice in a 3 dimensional grid coverage. Each slice can have anarbitrary width and height (like any two-dimensional images), but only 1 voxel depth (a "voxel" is a three-dimensional pixel).
Serialization note:
Because it is serializable, {@code GridCoverage2D} can be included as method argument or asreturn type in Remote Method Invocation (RMI). However, the pixel data are not sent during serialization. Instead, the image data are transmitted "on-demand" using socket communications. This mechanism is implemented using JAI {@link SerializableRenderedImage}class. While serialization (usually on server side) should work on J2SE 1.4 and above, deserialization (usually on client side) of {@code GridCoverage2D} instances requires J2SE 1.5. @since 2.1 @source $URL$ @version $Id$ @author Martin Desruisseaux (IRD)

                bgColor.setValue((bColor == null) ? ImageMosaicJDBCFormat.BACKGROUND_COLOR
                        .getDefaultValue()
                        : bColor);




    GridCoverage2D coverage = (GridCoverage2D) reader
        .read(new GeneralParameterValue[] { gg, outTransp,bgColor });


    if (coverage!=null) {
        ImageIO.write(coverage.getRenderedImage(), "tif", new File(
        getOutPutDir() + File.separator + name + ".tif"));
    }
  }

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    public void testBandNames() throws Exception {
        final File file = TestData.file(GeoTiffReaderTest.class, "wind.tiff");
        assertNotNull(file);
        final AbstractGridFormat format = new GeoTiffFormat();
        GridCoverage2D coverage = format.getReader(file).read(null);
        String band1Name = coverage.getSampleDimension(0).getDescription().toString();
        String band2Name = coverage.getSampleDimension(1).getDescription().toString();
        assertEquals("Band1", band1Name);
        assertEquals("Band2", band2Name);
    }

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        if (format.accepts(file)) {
            // getting a reader
            GeoTiffReader reader = new GeoTiffReader(file, new Hints(Hints.FORCE_LONGITUDE_FIRST_AXIS_ORDER, Boolean.TRUE));
            if (reader != null) {
                // reading the coverage
                GridCoverage2D coverage = (GridCoverage2D) reader.read(null);
                assertNotNull(coverage);
                assertTrue(coverage.getRenderedImage().getSampleModel().getNumBands() == 1);
                final ParameterValue<Color> colorPV = AbstractGridFormat.INPUT_TRANSPARENT_COLOR.createValue();
                colorPV.setValue(Color.BLACK);
                coverage = (GridCoverage2D) reader.read(new GeneralParameterValue[] { colorPV });
                assertNotNull(coverage);
                assertTrue(coverage.getRenderedImage().getSampleModel().getNumBands() == 2);


                // showing it
                if (TestData.isInteractiveTest())
                    coverage.show();
                else
                    PlanarImage.wrapRenderedImage(coverage.getRenderedImage()).getTiles();


            }


        } else
            assertFalse(true); // we should not get here


        
        file = TestData.file(GeoTiffReaderTest.class,"gaarc_subset.tiff");        
        if (format.accepts(file)) {
            // getting a reader
            GeoTiffReader reader = new GeoTiffReader(file, new Hints(Hints.FORCE_LONGITUDE_FIRST_AXIS_ORDER, Boolean.TRUE));
            if (reader != null) {
                // reading the coverage
                GridCoverage2D coverage = (GridCoverage2D) reader.read(null);
                assertNotNull(coverage);
                assertTrue(coverage.getRenderedImage().getSampleModel().getNumBands() == 3);
                final ParameterValue<Color> colorPV = AbstractGridFormat.INPUT_TRANSPARENT_COLOR.createValue();
                colorPV.setValue(new Color(34,53,87));
                coverage = (GridCoverage2D) reader.read(new GeneralParameterValue[] { colorPV });
                assertNotNull(coverage);
                assertTrue(coverage.getRenderedImage().getSampleModel().getNumBands() == 4);


                // showing it
                if (TestData.isInteractiveTest())
                    coverage.show();
                else
                    PlanarImage.wrapRenderedImage(coverage.getRenderedImage()).getTiles();


            }


        } else
            assertFalse(true); // we should not get here
        
        // now we test that we cannot do colormasking on a non-rendered output
        file = TestData.file(GeoTiffReaderTest.class,"wind.tiff");        
        if (format.accepts(file)) {
            // getting a reader
            GeoTiffReader reader = new GeoTiffReader(file, new Hints(Hints.FORCE_LONGITUDE_FIRST_AXIS_ORDER, Boolean.TRUE));
            if (reader != null) {
                // reading the coverage
                GridCoverage2D coverage = (GridCoverage2D) reader.read(null);
                assertNotNull(coverage);
                assertTrue(coverage.getRenderedImage().getSampleModel().getNumBands() == 2);
                final ParameterValue<Color> colorPV = AbstractGridFormat.INPUT_TRANSPARENT_COLOR.createValue();
                colorPV.setValue(new Color(34,53,87));
                try{
                    coverage = (GridCoverage2D) reader.read(new GeneralParameterValue[] { colorPV });
                    assertFalse(true); // we should not get here

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        rasterArea.setSize(dim);
        final GridEnvelope2D range= new GridEnvelope2D(rasterArea);
        GridGeometry2D gridGeometry = new GridGeometry2D(range,envelope);
        gg.setValue(gridGeometry);


        GridCoverage2D coverage = reader.read(new GeneralParameterValue[] {gg});
        RenderedImage image = coverage.getRenderedImage();
        assertEquals(image.getWidth(), 2);
        assertEquals(image.getHeight(), 2);
        
        final double delta = 0.00001;
        assertEquals(availableResolutions[0][0], 5, delta);

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    assertNotNull(reader);
          
    //
    // Show the coverage
    //
                final GridCoverage2D coverage = (GridCoverage2D) reader.read(null);
                assertEquals("pyramid", coverage.getName().toString());
                assertNotNull("Null value returned instead of a coverage", coverage);
                assertTrue("coverage dimensions different from what we expected",
                                coverage.getGridGeometry().getGridRange().getSpan(0) == 250
                                                && coverage.getGridGeometry().getGridRange().getSpan(
                                                                1) == 250);
    
                if (TestData.isInteractiveTest())
                    coverage.show("testDefaultParameterValue");
                else
                    PlanarImage.wrapRenderedImage(((GridCoverage2D) coverage).getRenderedImage()).getTiles();


  }

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    assertNotNull(reader);


    //
    // Show the coverage
    //
    final GridCoverage2D coverage = (GridCoverage2D) reader.read(null);
    assertNotNull("Null value returned instead of a coverage", coverage);
    assertTrue("coverage dimensions different from what we expected",
        coverage.getGridGeometry().getGridRange().getSpan(0) == 250
            && coverage.getGridGeometry().getGridRange().getSpan(
                1) == 250);
    if (TestData.isInteractiveTest())
      coverage.show("testDefaultParameterValueFile");
    else
      PlanarImage.wrapRenderedImage(((GridCoverage2D) coverage).getRenderedImage()).getTiles();


  }

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    assertNotNull(reader);


    //
    // Show the coverage
    //
    final GridCoverage2D coverage = (GridCoverage2D) reader.read(null);
    assertNotNull("Null value returned instead of a coverage", coverage);
    assertTrue("coverage dimensions different from what we expected",
        coverage.getGridGeometry().getGridRange().getSpan(0) == 250
            && coverage.getGridGeometry().getGridRange().getSpan(
                1) == 250);
    if (TestData.isInteractiveTest())
      coverage.show("testDefaultParameterValueString");
    else
        PlanarImage.wrapRenderedImage(((GridCoverage2D) coverage).getRenderedImage()).getTiles();


  }

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    transp.setValue(Color.black);


    //
    // Show the coverage
    //
    GridCoverage2D coverage = (GridCoverage2D) reader.read(new GeneralParameterValue[] {  transp });
    assertNotNull(coverage);
    assertTrue("coverage dimensions different from what we expected",coverage.getGridGeometry().getGridRange().getSpan(0) == 250&& coverage.getGridGeometry().getGridRange().getSpan(1) == 250);
    if (TestData.isInteractiveTest())
      coverage.show("testComplete");
    else
      PlanarImage.wrapRenderedImage(((GridCoverage2D) coverage).getRenderedImage()).getTiles();


  }

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        250, 250)), cropEnvelope));


    //
    // Show the coverage
    //
    GridCoverage2D coverage = ((GridCoverage2D) reader
        .read(new GeneralParameterValue[] { gg }));
    assertNotNull("Null value returned instead of a coverage", coverage);
    assertTrue("coverage dimensions different from what we expected",
        coverage.getGridGeometry().getGridRange().getSpan(0) == 254
            && coverage.getGridGeometry().getGridRange().getSpan(
                1) == 254);
    if (TestData.isInteractiveTest())
      coverage.show("testCropHighestLevel");
    else
      PlanarImage.wrapRenderedImage(coverage.getRenderedImage()).getTiles();


  }

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        125, 125)), cropEnvelope));


    //
    // Show the coverage
    //
    GridCoverage2D coverage = ((GridCoverage2D) reader
        .read(new GeneralParameterValue[] { gg }));
    assertNotNull("Null value returned instead of a coverage", coverage);
    // assertTrue("coverage dimensions different from what we expected",
    // coverage.getGridGeometry().getGridRange().getSpan(0) == 63
    // && coverage.getGridGeometry().getGridRange().getSpan(
    // 1) == 62);
    if (TestData.isInteractiveTest())
      coverage.show("testCropLevel1");
    else
        PlanarImage.wrapRenderedImage(((GridCoverage2D) coverage).getRenderedImage()).getTiles();


  }

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