Hi Martin,
on the following link there is some code which allows you to handle 4 bytes
as a float and 8 bytes as a double.
http://pastebin.com/m58d7f133
Regards,
Daniele
On Thu, Apr 30, 2009 at 12:19 PM, Martin Tomko <martin.to...@geo.uzh.ch>wrote:
> Dear Simone, Martin,
> yes, it is unfortunate - but while I will push for a change of the
> server, it is not a solution in the short term (deadlines!). Simone, if
> you have a simple code to do the shifting, please, could you share it?
> I tried searching for something like that, but I am not confident enough
> that I got it right. I would first coverage.evaluate to get the byte[]
> with the values for all the bands, and then somehow couple them togethe
> using something like:
> java.nio.ByteBuffer buf = ByteBuffer.wrap(b);
> return buf.getFloat();
>
>
> Is it correct?
>
> Cheers
> Martin
>
> Simone Giannecchini wrote:
> > Ciao Martin,
> > please read below...
> >
> > -------------------------------------------------------
> > 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 11:28 AM, Martin Tomko <martin.to...@geo.uzh.ch>
> wrote:
> >
> >> 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 guess I need to subscribe to the deegree ml and tell them about
> > imageio-ext, where we fixed those problems :-).
> >
> >
> >
> >> 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
> >>
> >
> > Well, if you can, I would switch to geoserver or mapserver for wcs,
> > you should not have these problems.
> > If you *have* to use deegree you need to reconstruct the correct
> > geotiff, pixel by pixel, but this highly not standard.
> > If you want the code to go from 4 bytes to float or from 8 bytes to
> > double I can pass it over.
> >
> > Simone.
> >
> >
> >
> >> 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
> >>>>
> >>>>
> ------------------------------------------------------------------------------
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> >>>>
> >>>>
> >>>>
> >>>
> >>>
> >> --
> >> 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 <http://www.geo.uzh.ch/%7Emtomko>
> >> mob: +41-788 629 558
> >> tel: +41-44-6355256
> >> fax: +41-44-6356848
> >>
> >>
> >>
> ------------------------------------------------------------------------------
> >> Register Now & Save for Velocity, the Web Performance & Operations
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> >> _______________________________________________
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> >>
> >>
> >
> >
> >
>
>
> --
> 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 <http://www.geo.uzh.ch/%7Emtomko>
> mob: +41-788 629 558
> tel: +41-44-6355256
> fax: +41-44-6356848
>
>
>
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--
-------------------------------------------------------
Eng. Daniele Romagnoli
Software Engineer
GeoSolutions S.A.S.
Via Carignoni 51
55041 Camaiore (LU)
Italy
phone: +39 0584983027
fax: +39 0584983027
mob: +39 328 0559267
http://www.geo-solutions.it
-------------------------------------------------------
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