Re: [Geotools-devel] Questions about working with ECW images in Geotools.

[Daniele R. <dan...@ge...>]

Hi Landon,
you talked with Simone :)



On Wed, May 13, 2009 at 5:18 PM, Sunburned Surveyor <
sun...@gm...> wrote:

> Someone on the OSGeo discuss list pointed out that Geotools has
> support for ECW images in a round-about way. I have been taking a look
> at the Javadoc and had a question or two.
>
> - I see that I can use the ECWReader to obtain a GridCoverage2D
> object. I didn't see a way to immediately pass a GridCoverage2D object
> to an object that would let me write a TIFF image or a JPEG. Is this
> possible? Or do I need to first obtain a RenderedImage?


> - If I can't write a GridCoverage2D object directly to TIFF or JPEG,
> are there any suggestions on how I would write a RenderedImage to one
> of these formats?


GridCoverageWriters  (as an instance, GeoTIFFWriter and WorldImageWriter)
allow you to directly write a GridCoverage.
Anyway, in case you want to use imageio writers (TIFFImageWriter,
JPEGImageWriter,..)  the GridCoverage2D class has a getRenderedImage method
which provide you a RenderedImage.

See belove for a simple quick test code writing:
 1) a GridCoverage to a GeoTIFF
 2) a RenderedImage to a JPEG a image  .



>
> - Can Geotools be used to write ECW images? I didn't see a write class.


Actually not.


Writing example:
---------------------------------------------
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;

import org.geotools.coverage.grid.GridCoverage2D;
import org.geotools.coverageio.gdal.ecw.ECWFormat;
import org.geotools.gce.geotiff.GeoTiffFormat;
import org.opengis.coverage.grid.GridCoverageReader;
import org.opengis.coverage.grid.GridCoverageWriter;

import com.sun.imageio.plugins.jpeg.JPEGImageWriterSpi;

public class GeoTiffWriteTest {

    private static void writeGridCoverage() throws IllegalArgumentException,
IOException{
        final File file = new File("c:/test.ecw");
        final File filetiff = new File("c:/test.tiff");
        final ECWFormat ecwformat = new ECWFormat();
        final GeoTiffFormat tiffformat = new GeoTiffFormat();
        // getting a reader
        final GridCoverageReader reader = ecwformat.getReader(file);
        final GridCoverage2D gc = (GridCoverage2D) reader.read(null);

        final GridCoverageWriter writer = tiffformat.getWriter(filetiff);
        writer.write(gc, null);
        writer.dispose();

    }

    private static void writeRenderedImage() throws IOException{
        final File file = new File("c:/test.ecw");
        final File outputFile = new File("c:/test.jpg");
        final ImageOutputStream ostream =
ImageIO.createImageOutputStream(outputFile);
        final ECWFormat ecwformat = new ECWFormat();
        // getting a reader
        final GridCoverageReader reader = ecwformat.getReader(file);
        final GridCoverage2D gc = (GridCoverage2D) reader.read(null);
        final ImageWriter writer = new
JPEGImageWriterSpi().createWriterInstance();
        writer.setOutput(ostream);
        writer.write(gc.getRenderedImage());
        ostream.flush();
        ostream.close();
        writer.dispose();
    }

    public static void main(String[] args) throws IllegalArgumentException,
IOException{
        writeGridCoverage();
        writeRenderedImage();
    }

}


Regards,
Daniele



>
>
> Once again, it appears as if the Geotools programmers have already
> boldly gone where I need to go. Thanks for all of the hard work and
> patience with my questions.
>
> Landon
>
>
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Eng. Daniele Romagnoli
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