Stefan and Larry, thank you for your help. Unfortunately I'm not an expert either, so I'm really not sure about what to do. I kind of like Larry's approach (but I need to think about it to see if I can work something out of it). I'll have a deeper look at the pirol classes too...
Alberto On 28/06/2010 21:49, Stefan Steiniger wrote: > actually.. wasn't there a scaling function somewehere in the pirol classes? > so the place to correct is in those? > > 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 > > ------------------------------------------------------------------------------ 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
