Hei Alberto, I also had the problem, but having only black images...I need to think about this (neither being an expert on this topic) - and I will be off this week until next, so no answer soon...
I wonder if Victor Olaya had an idea (or the Geotools or uDig people)...maybe we should ask them first? stefan Alberto De Luca schrieb: > Dear OJ developers, > > I was working on the Sextante classes, trying to enhance raster support > and visualization capabilities. Having a powerful raster management is > important so we can port to OJ all the raster plugins we developed for > the OJ-derived AdB-ToolBox (we exchanged some emails on the topic a > while ago). > > So, as a first attempt, I tried to add ESRI FLT raster support, adding > some lines of code to the RasterImageLayer class. I am here facing a > dilemma though. > > The loadImage method returns a planarimage, which is then displayed on > the screen. > If I read the FLT file into a TiledImage whose SampleModel is > DataBuffer.TYPE_FLOAT (to match the data model of the FLT file) and > return it to be displayed, OJ loads it ok, but the raster displayed is > completely blank. I know it's there because I can export its envelope > and I can read cell values (using the OpenJUMPSextanteRasterLayer > class), values that exactly match the values stored in the FLT file. > If after creating the TiledImage I rescale it into a 0-255 range > PlanarImage, I can display it ok (as a grayscale for example) but then > when I read the cell values from the raster layer, they're clearly > different from the original FLT values. > > My question is: is there a way to have a correct visualization while > maintaining access to the actual cell values? In > www.lac.inpe.br/JIPCookbook/2200-display-surrogate.jsp > <http://www.lac.inpe.br/JIPCookbook/2200-display-surrogate.jsp> they > suggest the use of the javax.media.jai.iterator.RandomIter class to > access cell values after the image has been rescaled. Would this be > appropriate in OJ? > > In the attached GridFloat.java you can find the code used to read the > FLT grid (see the readGrid and the getPlanarImage methods). Also > attached you can find my modified RasterImageLayer class (see in > particular the loadImage method). > > Please consider I'm not a good programmer, so I might just be on a > completely wrong track... > Thanks > Alberto > > > > > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Sprint > What will you do first with EVO, the first 4G phone? > Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > > > ------------------------------------------------------------------------ > > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
