On Wed, Feb 2, 2011 at 5:33 PM, <[email protected]> wrote: > ??? I do not understand at all. > Within the new extended border, I need the pixels from the neighbor tiles. > > Normally, if I have a big image, > I create the pyramids and finally create the tiles for all levels. > > If I create the the tiles first and the pyramids for each tile individually, > it is possible that the tiles are different.
That may be a bug in the tile creation process? If the tile creation itself is using bilinear/bicubic interpolation the proper way to do compute a tile at level N is not to take just 4 tiles at level N - 1, but also all the neighbouring tiles in order to include the necessary border for the interpolation to work, crop so that only the required extra border is taken into account, rescale with interpolation, crop again to remove the eventual extra pixels that get in the result as an effect of having considered the extra border. If a tile happens to sit at the overall mosaic limits add a copy border extender to care for that case. The javax.media.jai.Interpolation class do provide information about how big the border should be in each direction (see the get*Padding methods) Cheers Andrea -- Ing. Andrea Aime Technical Lead GeoSolutions S.A.S. Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584962313 fax: +39 0584962313 http://www.geo-solutions.it http://geo-solutions.blogspot.com/ http://www.linkedin.com/in/andreaaime http://twitter.com/geowolf ----------------------------------------------------- ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Geotools-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-devel
