great - I will have a look at it hopefully at the weekend stefan
Alberto De Luca wrote: > Stefan, > > thank you for your (not so late) answer, you told me you'd be away, so > no problem at all! > > I had a look at Erwan's plug in: very interesting work! Briefly, if I > got it right: he wrote a RasterLayer class that extends the jump Layer > class. He then uses some geotools classes to read the ASCII grid file, > and the GT GridCoverage2D class to store the raster values and > properties. This is a useful class, because it stores the rescaled > raster values as a PlanarImage (that can be passed to OJ for display), > but also the actual cell values (that can be retrieved anytime using the > appropriate method). > > On the other side, it seems to me that the OJ RasterImageLayer class > stores only the image information. But I think it shouldn't be difficult > to add a field (and a getter) to handle the raster cell data. I gave it > a try (only for FLT raster file handling, which I know best): > - I created a double[][] to store the raster values; > - I created a getter to get the whole array (this clearly could be > improved by adding direct access to single cell values); > > When an FLT is loaded: > - the array is filled right after the raster is read; > - the values are rescaled and passed over for visualization (as a b/w > stretched image); > > When the actual values are needed, they can be accessed via the getter. > This could be useful also when the image is redrawn, because it would > avoid the need to reload the raster form scratch. > > What do you think? Does this make any sense? > > You can find attached to this e-mail: > - inside the OJClasess archive the AddRasterImageLayerWizard, the > RasterImageLayer and the SelectRasterImageFilesPanel class that I > modified, plus the GridFloat class that actually reads the flt file. > - inside the Flt_plugin archive: a small plug in that creates a button > tool to inspect raster cell values (jar + src). You can try it out by > loading an flt raster (I included one in the archive) as a "Sextante > Raster Image", it should display in b/w. You can then use the tool to > inspect its cell values. I didn't do much testing though... > > Alberto > > > On 07/07/2010 05:41, Stefan Steiniger wrote: >> Hei Alberto, >> >> late answer but something just came to my mind. >> There was an ESRI Grid plugin by Erwan Bocher for OpenJUMP that allowed >> to display different colors for a DEM. That should be something we want >> - right? >> >> I think the code is here: >> http://geosysin.iict.ch/irstv-trac/browser/openjump/plugin/gridCoverage/org/reso/openJump/raster?rev=96 >> >> >> >> can you look into it? >> >> Not sure what would be needed to make it work with OpenJUMP and the >> Sextante Raster. But we can do changes to the core here... >> >> stefan >> >> PS: I was last week away - so thats why I didn't respond earlier; need >> to catch up with emails now. >> >> Alberto De Luca schrieb: >> >>> Larry and Steven, >>> >>> sorry for bothering you, I know you're both busy... I had a deeper look >>> at the RasterImageLayer class. Apparently there is a scaling function >>> there (as Stefan pointed out), but for what I can understand, the image >>> is read, then rescaled, then added to a Layerable. This means that the >>> Layerable stores the already scaled cell values and, if the actual cell >>> values are needed, the image needs to be reloaded. >>> >>> I don't see how this model can be tweaked to have on one side the cell >>> values stored in memory and on the other a Layerable that can be >>> rendered properly. What do you reckon? Please tell me I'm wrong. >>> >>> Thanks >>> Alberto >>> >>> On 29/06/2010 16:32, Larry Becker wrote: >>> >>>> Hi Alberto, >>>> >>>> I did take a look at the render architecture to see how it might be >>>> done, but unfortunately I don't have a lot of time right now to help >>>> with this effort so any advice I have is only a guess, but I think it >>>> might have to happen in the image layer's paint method. >>>> >>>> Larry >>>> >>>> On Tue, Jun 29, 2010 at 2:01 AM, Alberto De Luca >>>> <i...@geomaticaeambiente.it<mailto:i...@geomaticaeambiente.it>> wrote: >>>> >>>> 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> >>>> >> >>>> <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://sprint.com/first> -- >>>> http://p.sf.net/sfu/sprint-com-first >>>> >> >>>> >> >>>> >> >>>> >>>> ------------------------------------------------------------------------ >>>> >>>> >> >>>> >> _______________________________________________ >>>> >> Jump-pilot-devel mailing list >>>> >> Jump-pilot-devel@lists.sourceforge.net >>>> <mailto: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://sprint.com/first> -- >>>> http://p.sf.net/sfu/sprint-com-first >>>> > _______________________________________________ >>>> > Jump-pilot-devel mailing list >>>> > Jump-pilot-devel@lists.sourceforge.net >>>> <mailto: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://sprint.com/first> -- >>>> http://p.sf.net/sfu/sprint-com-first >>>> _______________________________________________ >>>> Jump-pilot-devel mailing list >>>> Jump-pilot-devel@lists.sourceforge.net >>>> <mailto: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 >>> >> ------------------------------------------------------------------------------ >> >> >> 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? 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