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 >>>> >>>> ----------------------------------------------------- >>>> >>>> ------------------------------------------------------------------------------ >>>> Download new Adobe(R) Flash(R) Builder(TM) 4 >>>> The new Adobe(R) Flex(R) 4 and Flash(R) Builder(TM) 4 (formerly >>>> Flex(R) Builder(TM)) enable the development of rich applications that run >>>> across multiple browsers and platforms. 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