I, once again, second what Jukka said. Original DTED ar 16 bits integers with a dynamic that is usually compressed towards 0 (hence black) and this should be retained in the final images. Once you get a sample geotiff, publish it in GeoServer using a colormap suitable for your data (start from this one as an instance https://github.com/geosolutions-it/geoserver/blob/master/data/release/styles/dem.sld ) which will turn values into colors.
That said, I believe you should look into ether gdal_merge or gdalbuildvrt to merge your files. Regards, Simone Giannecchini == Our support, Your Success! Visit http://opensdi.geo-solutions.it for more information. == Ing. Simone Giannecchini @simogeo Founder/Director GeoSolutions S.A.S. Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 333 8128928 http://www.geo-solutions.it http://twitter.com/geosolutions_it ------------------------------------------------------- On Thu, Nov 29, 2012 at 6:23 AM, Rahkonen Jukka <[email protected]> wrote: > Hi, > > Have you checked the histograms? It is not unusual that the histogram is > badly biased to the black end and image just shows black on the screen. If > this is the case then you will need to push the image through a histogram > stretch somehow, either by preprocessing or by letting Geoserver to do it. > Unfortunataly I have no ready recipes at hand for either. > > -Jukka Rahkonen- > ________________________________________ > mortac8 wrote: > >> I am trying to convert my DTED1 imagery image to one big GeoTiff but the >> GeoTiff is coming out all black. For example, the below command gives me a >> mosaic.tif image that is totally black. > >> gdalwarp -ot Int16 n29.dt1 mosaic.tif > >> Here is a link to my source image: >> https://www.dropbox.com/s/zjnbshnwmu67o3o/n29.dt1 > > Any ideas what I'm doing wrong? I am on Windows using FWTools 2.4.7. > > Thanks again! > Ashley > > > > -- > View this message in context: > http://osgeo-org.1560.n6.nabble.com/quick-performance-question-tp5016995p5019467.html > Sent from the GeoServer - User mailing list archive at Nabble.com. > > ------------------------------------------------------------------------------ > Keep yourself connected to Go Parallel: > VERIFY Test and improve your parallel project with help from experts > and peers. http://goparallel.sourceforge.net > _______________________________________________ > Geoserver-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geoserver-users > > ------------------------------------------------------------------------------ > Keep yourself connected to Go Parallel: > VERIFY Test and improve your parallel project with help from experts > and peers. http://goparallel.sourceforge.net > _______________________________________________ > Geoserver-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geoserver-users ------------------------------------------------------------------------------ Keep yourself connected to Go Parallel: TUNE You got it built. Now make it sing. Tune shows you how. http://goparallel.sourceforge.net _______________________________________________ Geoserver-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geoserver-users
