Ciao Jared,
I am sorry that I onl received this email now. The following code
snippet should do the trick. If ti does not work, pleas, let me know.
////
//
// Pre-requisites
//
////
GridCoverageFactory gcf = new GridCoverageFactory();
//you can use your image here
RenderedImage ri = JAI.create("ImageRead", new File(
"c:/work/data/004.tiff"));
//original envelope goes here
DirectPosition2D llc = new DirectPosition2D(
DefaultGeographicCRS.WGS84, -80, 50);
DirectPosition2D urc = new DirectPosition2D(
DefaultGeographicCRS.WGS84, -70, 40);
////
//
//Creating georeferencing
//
////
//final coordinate reference system.
CoordinateReferenceSystem finalCRS =
CRS.decode("EPSG:4267",true);
MathTransform mt = CRS.findMathTransform(
DefaultGeographicCRS.WGS84, finalCRS,
true);
//final envelope
GeneralEnvelope finalEnvelope = new GeneralEnvelope(2);
finalEnvelope.setCoordinateReferenceSystem(finalCRS);
finalEnvelope.add(mt.transform(llc, new
DirectPosition2D()));
finalEnvelope.add(mt.transform(urc, new
DirectPosition2D()));
////
//
//Creating final coverage
//
////
//creating final coverage
GridCoverage2D gc1 = gcf.create("test", ri,
finalEnvelope);
//creating final geotiff file
File f = new File("c:/work/data/geotiff1.tif");
GeoTiffWriter gtw = new GeoTiffWriter(f);
gtw.write(gc1, null);
Hope that helps.
Simone.
On 1/9/07, Jared B Dorny <[EMAIL PROTECTED]> wrote:
>
> All,
>
> I have the following information:
>
> BufferedImage object ( Read in from a file using ImageIO)
> A Coordinate Reference System ID (in this case its EPSG:4267 but it could be
> any valid one)
> Coordinates of the lower left corner and upper right corner in Latitude,
> Longitude (WGS84 (EPSG:4326))
> Filename
>
> What I want to do is create a method that takes the information and then
> writes out a Geotif with the correct header information. With out modifying
> the raster portion.
>
>
> Here is where I am struggling. I can convert the coordinates to the
> requested projection using techniques specified in the demo class for
> converting between systems. Which gives me two DirectPosition2D objects one
> for the lower left corner and one for the upper right corner.
>
> I then don't know how to create a Envelope since the Envelope2D takes a
> Rectangle. Which is the lower left coordinate and the width and height.
>
> How do I create the Rectangle from the two DirecPosition2D objects? that is
> correct for any passed in targetCRS.
>
> Once I have the envelope I can then create the GridCoverage and then write
> it out. (I have done this already)
>
> The key here is that I know the corners in terms of Lat- Long and the image
> is in a known projection. I need to get the points into the images
> projection to correctly write to GeoTiff.
>
> Any Ideas?
>
> Thanks,
>
> Jared
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--
-------------------------------------------------------
Eng. Simone Giannecchini
President /CEO GeoSolutions
http://www.geo-solutions.it
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