Ciao Kami, first of all let me apologize to all for the crossposting, but since you sent your question on 3 mailing lists it was easier for me to answer this way.
GeoTools handles geotiff pyramids through JAI-ImageIO. We are currently extending JAI-ImageIO with the Imageio-ext (see https://imageio-ext.dev.java.net/) to support new formats from GDAL, hence as soon as 1.5.3 gets released we will start tagging a first official release. Roughly speaking, we should have official releases for imageio-ext within the end of the year (FYI, we are also building support for JP2 through kakadu directly and we are also looking into integrating support for ImageMagick). I have not looked at the gvSIG codebase lately, even though I had an interesting discussion with the gcSIG mobile developers as well as with Victor Olaya (sextante) during the OSGEO codesprint in bolsena about collaboration on the IO raster side of the gvSIG world. As far as I know gvSIG should make use of the pyramids even though I am aware of some limitation. However, gvSG developers should have more information on this (feel also free to correct me if I am wrong). Just out of curiosity, I think it would be great to try and collaborate at the raster I/O level with the gvSIG team since what we are doing is currently used in GeoServer, GeoTools and uDig and widening the audience would be just great IMHO. I'll leave this up to the gvSIG developers/PMs. Simone. On Fri, Oct 10, 2008 at 6:13 AM, Kami ROUSSEAU <[EMAIL PROTECTED]> wrote: > Hello, > > I have a tiff file that contains a full size 16Kx16K image, compressed using > JPEG. The file also contains ten reduced size overviews. When this image is > opened in gvSIG, the overviews are not used; instead, the full size image is > red in memory. This reading operation takes a long time to complete. > > I know that Java Advanced Imaging (JAI) can handle image pyramids and that > Geotools uses this capability. I also know that gdal can use image pyramids. > Quantum GIS uses gdal to display an overview of the image. > > Is there an existing automatic or semi-automatic way to read an appropriately > sized overview instead, using gvSIG / jgdal? > > If so, what is it? > If not, what development would be necessary? What are the relevent libraries > / classes? Is there any reading material that could help? > > Kami Rousseau > > > __________________________________________________________________ > Ask a question on any topic and get answers from real people. Go to Yahoo! > Answers and share what you know at http://ca.answers.yahoo.com > _______________________________________________ > Gvsig_internacional mailing list > [EMAIL PROTECTED] > http://runas.cap.gva.es/mailman/listinfo/gvsig_internacional > > -- ------------------------------------------------------- Eng. Simone Giannecchini GeoSolutions S.A.S. Owner - Software Engineer Via Carignoni 51 55041 Camaiore (LU) Italy phone: +39 0584983027 fax: +39 0584983027 mob: +39 333 8128928 http://www.geo-solutions.it http://www.geo-solutions.it/simone.giannecchini http://www.linkedin.com/in/simonegiannecchini ------------------------------------------------------- ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Geotools-devel mailing list Geotools-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-devel
