The method you're using looks right. Are all the coordinates valid for the projections you're using?
i.e. "EPSG:4326" , Rectangle2D.Float(-180, -80, 360, 160) On Thu, Mar 24, 2011 at 4:56 AM, Peter Borissow <[email protected]> wrote: > Hi Guys- > Hate to bug you again. I downloaded a copy of uDig to see how the > reprojection works. Setting up a debug environment is not going to be as > straightforward as I had hoped. Before I embark on this endeavor, I have to > ask again - what is the proper why to reproject images using GeoTools? > Pretty please :-) > > Thanks!! > Peter > > > ________________________________ > From: Peter Borissow <[email protected]> > To: Andrea Aime <[email protected]> > Cc: Simone Giannecchini <[email protected]>; > [email protected] > Sent: Thu, March 17, 2011 7:29:56 AM > Subject: Re: [Geotools-gt2-users] Error Reprojecting Coverage to EPSG:900913 > > Hello Andrea/All- > I have attached an example of an image I am trying to reproject. The > image is just a plain jpeg returned from a wms. I would like to learn how to > transform the image into another projection. Here's the code I am using to > no avail. > > ----- > BufferedImage bi = ImageIO.read( > new File("C:/My Documents/earth.jpg")); > > Envelope2D envelope = new Envelope2D(CRS.decode("EPSG:4326", true), > new java.awt.geom.Rectangle2D.Float(-180, -80, 360, 160) > ); > > GridCoverage2D gc2d = new GridCoverageFactory().create("BMImage", bi, > envelope); > > GridCoverage2D gc2dProj = > (GridCoverage2D)Operations.DEFAULT.resample(gc2d, > CRS.decode("EPSG:3031")); > > //EPSG:3031,EPSG:4326,EPSG:3409,EPSG:3410,EPSG:3412,EPSG:32761 > > ImageIO.write(gc2dProj.getRenderedImage(), "JPEG", > new File("/temp/reproject_out.jpg")); > > ----- > > I get the same image out no matter which projection I choose. I am certain > this is operator error. Can you please point me in the right direction? Is > there a tutorial that I've missed? Should I download the source for uDig or > GeoServer and step through the debugger? Any guidance would be greatly > appreciated! > > Many Thanks, > Peter > > > > ________________________________ > From: Peter Borissow <[email protected]> > To: Andrea Aime <[email protected]> > Cc: Simone Giannecchini <[email protected]>; > [email protected] > Sent: Wed, March 9, 2011 4:37:57 PM > Subject: Re: [Geotools-gt2-users] Error Reprojecting Coverage to EPSG:900913 > > Hello Andrea- > Thanks for your prompt reply. I must admit, I still don't understand why > the input and output images are identical. The interior pixels representing > landmasses/oceans should be different when I go from WGS84 to Mercator. > > Perhaps I need to take a different tact? Maybe I need to use a different set > of classes? Is there an article or post you can point me to? > > Thanks! > Peter > > > ________________________________ > From: Andrea Aime <[email protected]> > To: Peter Borissow <[email protected]> > Cc: Simone Giannecchini <[email protected]>; > [email protected] > Sent: Wed, March 9, 2011 3:40:18 PM > Subject: Re: [Geotools-gt2-users] Error Reprojecting Coverage to EPSG:900913 > > On Wed, Mar 9, 2011 at 8:53 PM, Peter Borissow <[email protected]> > wrote: >> >> Hmm... I would have thought that the Google projection, like most mercator >> projections, would have had warped features a little differently. For >> example, Greenland would look radically different on a Mercator projection >> than a WGS84 "projection". Maybe I should try a different "world" projection >> to test whether the reprojection is working? I tried a Robinson and >> Mollweide projection but they seem to be unsupported (I can create an >> envelope but the coverage transformation is bombing out). Anyone know of >> another global projection I can test with? Just need an EPSG code to see if >> the coverage transformation is working. > > The Mercator does that, but the reprojection code does not unecessarily > change the image, in that case it just changes the world to image > transformation, it's not adding pixels. > In fact the code will always generate in image with the same number of > pixels as the original one, it will change the pixel values as needed and > change the grid to world > transformation accordingly. > Mollweide and Eckert IV are supported in the latest source builds from > trunk, but they are not available on 2.6.x. > However Robinson is available since 2.6.3, though it does not have any > associated EPSG code (the EPSG database > hardly has any atlas worthy projection in, Mollweide, Eckert VI and Winkel > Tripel are also supported by GeoTools > trunk but don't have a EPSG code) > Cheers > Andrea > -- > ------------------------------------------------------- > Ing. Andrea Aime > GeoSolutions S.A.S. > Tech lead > > Via Poggio alle Viti 1187 > 55054 Massarosa (LU) > Italy > > phone: +39 0584 962313 > fax: +39 0584 962313 > mob: +39 333 8128928 > > http://www.geo-solutions.it > http://geo-solutions.blogspot.com/ > http://www.youtube.com/user/GeoSolutionsIT > http://www.linkedin.com/in/andreaaime > http://twitter.com/geowolf > > ------------------------------------------------------- > > > > > ------------------------------------------------------------------------------ > Enable your software for Intel(R) Active Management Technology to meet the > growing manageability and security demands of your customers. Businesses > are taking advantage of Intel(R) vPro (TM) technology - will your software > be a part of the solution? Download the Intel(R) Manageability Checker > today! http://p.sf.net/sfu/intel-dev2devmar > _______________________________________________ > Geotools-gt2-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users > > ------------------------------------------------------------------------------ Enable your software for Intel(R) Active Management Technology to meet the growing manageability and security demands of your customers. Businesses are taking advantage of Intel(R) vPro (TM) technology - will your software be a part of the solution? Download the Intel(R) Manageability Checker today! http://p.sf.net/sfu/intel-dev2devmar _______________________________________________ Geotools-gt2-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
