Hi Martin,. Simone, I have asked at the deegree list, and this is the response I got from Andreas:
<quote> this is the way the WCS works. One reason for this is Java or better ImageIO, JAI and Batik which are used by deegree for handling TIFFs. According to these libs it is possible to create a one band TIFF with FLOAT or DOUBLE data type but you can't read them with these libs. This may sounds strange but unfortunately it is like this (if somebody knows a solution we would be gratefull). Therefore we use a four band TIFF where each byte of a float value (e.g. DEM) is written to one of the bands. An application can read the TIFF as image an reconstruct the float values by combining the four bytes of each pixel. </quote> I asked for a more exact specification of the transformation. I have personally NO experience with handling colors in such situations, and I hope that a solution is possible - we are sort of dependent on the WCS... Martin Simone Giannecchini wrote: > Ciao, > michael, Id' take into account that much probably the RGBA data was > created using a colormap like approach, hence band combination won't > do, unfortunately. > I guess that the point is understanding why the data became RGBA at > the WCS stage when the suorce data was a dem. > > Of course, this is mho :-) > > Simone. > ------------------------------------------------------- > Ing. 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://simboss.blogspot.com/ > http://www.linkedin.com/in/simonegiannecchini > > ------------------------------------------------------- > > > > On Thu, Apr 30, 2009 at 11:03 AM, Michael Bedward > <michael.bedw...@gmail.com> wrote: > >> Hi Martin, >> >> I can't help at all with the WCS aspect of this question (I know >> nothing) but as to converting the coverage you have into a single band >> version (as a last resort solution): if you know the details of the >> calculation used to create the four bands you can run that in reverse >> with a JAI BandCombine operation. >> >> Michael >> >> ------------------------------------------------------------------------------ >> Register Now & Save for Velocity, the Web Performance & Operations >> Conference from O'Reilly Media. Velocity features a full day of >> expert-led, hands-on workshops and two days of sessions from industry >> leaders in dedicated Performance & Operations tracks. Use code vel09scf >> and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf >> _______________________________________________ >> Geotools-gt2-users mailing list >> Geotools-gt2-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users >> >> > > > -- Martin Tomko Postdoctoral Research Assistant Geographic Information Systems Division Department of Geography University of Zurich - Irchel Winterthurerstr. 190 CH-8057 Zurich, Switzerland email: martin.to...@geo.uzh.ch site: http://www.geo.uzh.ch/~mtomko mob: +41-788 629 558 tel: +41-44-6355256 fax: +41-44-6356848 ------------------------------------------------------------------------------ Register Now & Save for Velocity, the Web Performance & Operations Conference from O'Reilly Media. Velocity features a full day of expert-led, hands-on workshops and two days of sessions from industry leaders in dedicated Performance & Operations tracks. Use code vel09scf and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf _______________________________________________ Geotools-gt2-users mailing list Geotools-gt2-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
