[Geotools-gt2-users] create geotiff

[咳咳>唉倪 <565...@qq...>]

Hello~


I am very new to geotools,and I have to create a geotiff from a bufferedimage. Then 
during the progress I get several problems and I can't solve it by myself immediately.
So,if it is convenient for you to help me with that ,I would be very grateful.


Q1:I have tried to write the bufferedimage to "tif" first,then use geotools to convert "tif" to "geotiff",but after I get the "geotiff" and open it with the arcMap , arcMap point me "The following data sources use a geographic coordinate system that is different from the one used by the data frame you are adding the data into".Really don't understand why this happened.


Q2:And the Properties of my "geotiff" shows that the Statistics have not been calculated, it seems like that I didn't set the bands ,and I need to set the bands so others could use the geotiff to build a pyramid  .All I know is that I need to do something with the "Sampledimensions" before I create a GridCoverage ,but I don't know how to do it.


BTW,I open the "tif" with the arcMap,it has a RGBA composite.
I fould the function in  http://docs.geotools.org/latest/userguide/tutorial/raster/image.html can createRGBstyle for displaying the map,but I need to create a geotiff file,not just dispalying it.


What am I doing wrong ? 
What I can do ?

Thanks in advance！！！



 1:bufferedimage to tif
 2:tif to geotiff
         public void CreateGeotiffFromTiff(HttpServletRequest request, ServletOutputStream out){

                 byte[] bytes=null;
                 ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
                 double xmax=148.384765624315;
                 double ymax=55.990478515196884;

                 double xmin=59.615234375685;
                 double ymin=0.5095214848031198;
                 double width=xmax-xmin;
                 double height=ymax-ymin;



                 RenderedImage mapraster = JAI.create("ImageRead", new File("c:/img/tiff/theImageMaptiff.tif"));
                 

                 //show image
                 try {
                         ImageIO.write(mapraster, "png", outputStream);
                         bytes=outputStream.toByteArray();
                         out.write(bytes);
                 } catch (IOException e1) {
                         // TODO Auto-generated catch block
                         e1.printStackTrace();
                 }


                 GridCoverageFactory gcf = new GridCoverageFactory();
                 CoordinateReferenceSystem finalCRS = null;
                 try {
                         finalCRS = CRS.decode("EPSG:4326",true);
                 } catch (NoSuchAuthorityCodeException e) {
                         System.out.println(e.getMessage());
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                 } catch (FactoryException e) {
                         // TODO Auto-generated catch block
                         System.out.println(e.getMessage());
                         e.printStackTrace();
                 }

                 Envelope2D finalEnvelope = new Envelope2D(finalCRS,xmin,ymin,width,height);
                 //creating final coverage
                 GridCoverage cov = gcf.create("geotifftest",mapraster, finalEnvelope);


                 GridCoverage2D cov2d= (GridCoverage2D)Operations.DEFAULT.resample(cov,finalCRS);
                 //creating final geotiff file
                 File outfile = new File("C:/img/try/CreareGeotiff.tif");

                 CoverageProcessor processor = new CoverageProcessor(null);
                 ParameterValueGroup params = processor.getOperation("Resample").getParameters();
                 params.parameter("CoordinateReferenceSystem").setValue(finalCRS);
                 params.parameter("Source").setValue(cov2d);
                 params.parameter("InterpolationType").setValue(Interpolation.getInstance(Interpolation.INTERP_NEAREST));

                 cov2d=(GridCoverage2D)processor.doOperation(params);


                 GeoTiffWriter gtw = null;
                 try {
                         gtw = new GeoTiffWriter(outfile);

                         gtw.write(gc1, null);
                         gtw.write(cov2d, (GeneralParameterValue[])params.values().toArray(new GeneralParameterValue[1]));
                 } catch (IllegalArgumentException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                 } catch (IndexOutOfBoundsException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                 } catch (IOException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                 }
                 gtw.dispose();
                 cov2d.dispose(true);

         }
 }