Ciao Simone,
thanks for your reply!
I solved the problem just scaling each tile from 0 to 65535 using
gdal_translate, but now that I read your post it's perfectly clear why I had
that result, and how to solve the problem in a proper way... Thank you!
The next step will be to try to create a raster from a vector, let see what
I can do =)
Grazie ancora!
--
Stefano
On 3 November 2010 08:41, Simone Giannecchini <
simone.giannecch...@geo-solutions.it> wrote:
> Ciao Stefano,
> please read below...
> -------------------------------------------------------
> ===
> Notice that our office phone number has recently changed!
> Please, update your records!
> ===
> Ing. Simone Giannecchini
> GeoSolutions S.A.S.
> Founder
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
>
> phone: +39 0584962313
> fax: +39 0584962313
> mob: +39 333 8128928
>
>
> http://www.geo-solutions.it
> http://geo-solutions.blogspot.com/
> http://www.linkedin.com/in/simonegiannecchini
> http://twitter.com/simogeo
>
> -------------------------------------------------------
>
>
>
> On Wed, Oct 20, 2010 at 5:27 PM, Armisael <armisael.si...@gmail.com>
> wrote:
> > Ok, some update,
> >
> > thanks to you now I can see my DTED level 0! But there is a (little?)
> > problem: it seems that in the resulting image the tiles are not
> > correctly merged, since every single tile has its own color range, so
> > at the borders there is a marked difference. This happen with all the
> > methods I tried:
> > - using gdal_merge.py to merge all the tiles directly from the dt0 files;
> > - using gdal_translate to create a tiff for every dt0 file and then
> > merging them with gdal_merge.py;
> > - using the imagemosaic plugin on the 414 small tiffs created from the
> > dt0 files.
> >
> > Note that gdal_translate called with param "-expand rgb" (just for
> > testing) gave me "Error : band 1 has no color table".
>
> The dted is single band raw data (16 bits) I don't see how a color
> expansion would work on this data. It needs
> a colormapped imagery.
>
> > Note also that the generated geotiff appears completely black, the
> > only way to see the DTED is to open it using geoserver, or to increase
> > the contrast using an image editor... So the file is correctly
> > created, but something wrong happens on the color interval used,
> > probably.
>
> Again, I see a little confisione here. DTED data is not a picture is
> elevation data on 16 bits, therefore if you try to visualize it
> directly you should see all black since
> the heighest point on the eart is less than 9000 while the maximum
> value allowed by 16 bits is much bigger, therefore the dynamic of the
> data is compressed towards zero (black).
>
>
> Here is what you need to do:
>
> -1- try to merge the data into larget geotiff + add overviews
> -2- use a proper style, you can find some more info here:
> http://blog.geoserver.org/2008/11/20/raster-symbolizer-tricks-part-1/
>
>
> Ciao,
> Simone.
>
>
>
> >
> > Thank you!
> >
> > --
> > Stefano
> >
> >
> >
> > On 19 October 2010 22:42, Armisael <armisael.si...@gmail.com> wrote:
> >> Thank you for your suggestion, if I've understood correctly I should:
> >> - convert all the tiles in geotiff
> >> - merge them into larger geotiff if needed
> >> - create an index file (shapefile) for the ImageMosaic plugin and
> >> configure it in geoserver
> >>
> >> I'm developing a webgis for an humanitarian organization working in
> >> Zambia, right now I'm trying to load generic data like boundaries,
> >> cities, interesting location and DTED, then I'll have to create new
> >> vector and raster layers from their database...
> >>
> >> I'll let you know!
> >>
> >> Thanks again
> >>
> >> --
> >> Stefano
> >>
> >>
> >>
> >> On 18 October 2010 03:50, Simone Giannecchini
> >> <simone.giannecch...@geo-solutions.it> wrote:
> >>> I would also add this:
> >>>
> >>> - create a script using gdal traslate and convert them to geotiff
> >>> - merge the single files, in case they are small into larger geotiff
> files.
> >>>
> >>> Aside, can you tell us something about what you are doing with
> GeoServer?
> >>> Simone.
> >>> -------------------------------------------------------
> >>> ===
> >>> Notice that our office phone number has recently changed!
> >>> Please, update your records!
> >>> ===
> >>> Ing. Simone Giannecchini
> >>> GeoSolutions S.A.S.
> >>> Founder
> >>> Via Poggio alle Viti 1187
> >>> 55054 Massarosa (LU)
> >>> Italy
> >>>
> >>> phone: +39 0584962313
> >>> fax: +39 0584962313
> >>> mob: +39 333 8128928
> >>>
> >>>
> >>> http://www.geo-solutions.it
> >>> http://geo-solutions.blogspot.com/
> >>> http://www.linkedin.com/in/simonegiannecchini
> >>> http://twitter.com/simogeo
> >>>
> >>> -------------------------------------------------------
> >>>
> >>>
> >>>
> >>> On Mon, Oct 18, 2010 at 8:34 AM, Andrea Aime
> >>> <andrea.a...@geo-solutions.it> wrote:
> >>>> On Mon, Oct 18, 2010 at 5:20 AM, Armisael <armisael.si...@gmail.com>
> wrote:
> >>>>> OK, it seems that I have to insert the dt0 file in order to create
> the
> >>>>> store, and it works!
> >>>>> Not, the point is that I have 414 dt0 files! Do I really have to
> >>>>> create a store for each of them?
> >>>>> Do you know if there is something more appropriate for this task? Or
> >>>>> at least if there is an automatic way to do it?
> >>>>
> >>>> Many files. Are they tiles of the same seamless data set?
> >>>> If so, put all of them in the same directory and point the image
> mosaic plugin
> >>>> to it.
> >>>> Otherwise you can use the REST config extension and create a script to
> import
> >>>> them all with your preferred scripting language
> >>>>
> >>>> Cheers
> >>>> Andrea
> >>>>
> >>>> -----------------------------------------------------
> >>>> Ing. Andrea Aime
> >>>> Senior Software Engineer
> >>>>
> >>>> GeoSolutions S.A.S.
> >>>> Via Poggio alle Viti 1187
> >>>> 55054 Massarosa (LU)
> >>>> Italy
> >>>>
> >>>> phone: +39 0584962313
> >>>> fax: +39 0584962313
> >>>>
> >>>> http://www.geo-solutions.it
> >>>> http://geo-solutions.blogspot.com/
> >>>> http://www.linkedin.com/in/andreaaime
> >>>> http://twitter.com/geowolf
> >>>>
> >>>> -----------------------------------------------------
> >>>>
> >>>>
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