Hi Joachim, the "using internal..." message is normal and simply states that if there is a no data value it's converted to 0xFFFF. Anyway I can't see a reason why it fails. But you can try to load the hgt directly. QLGT supports *.tif *.tiff *.hgt *.blx *.vrt. Maybe that gives a hint why it's not working. Also it's a good idea to start QLGT from the console with parameter "-d". That enables the debug messages.
HTH Oliver > Gesendet: Montag, 01. April 2013 um 15:08 Uhr > Von: "Joachim Ullrich" <[email protected]> > An: [email protected] > Betreff: [Qlandkartegt-users] DEM northern 60 degrees > > Hello, > > standard SRTM data are limited to latitude between +/- 60 degrees. From this > page: > http://www.viewfinderpanoramas.org/Coverage%20map%20viewfinderpanoramas_org3.htm > > I downloaded datasets in hgt format which pretend to have elevation data for > northern regions. I verified one of the hgt files (N67E017.hgt) that it does > not contain only "NoData Values" (i.e. -32768). > > To convert the files to GTif, I followed the instractions from: > http://sourceforge.net/apps/mediawiki/qlandkartegt/index.php?title=Use_SRTM_data_as_Digital_Elevation_Model_%28DEM%29 > > I used smrtconvert.py, which uses this command: > gdalwarp -t_srs "+proj=merc +lon_0=0 +k=1 +x_0=0 +y_0=0 +ellps=WGS84 > +datum=WGS84 +units=m +no_defs" -r cubic <hgt-file> <tif-file> > > When I apply this to any of the hgt files, I get the message "Using internal > nodata values (eg. -32768) for image ...". Nevertheless smrtconvert.py creates > a srtm.tif file. When I attach this to the map in QLandkarteGT, I get no > elevation information. > > I repeated this procedure for a region in germany (far south of 60 degree > north) with the same result: the file srtm is generated but QLandkarteGT > doesn't show any elevation data (and all other 3D features are unavailable). > > As an additional check, I downloaded SRTM data from http://srtm.csi.cgiar.org > (SRTM_500m.tif and SRTM_NE_250m.tif). Using these data with QLandkarteGT I get > elevation information. Unfortunately no data northern than 60 degrees. > > So my questions: > are there DEM data available for northern scandinavia? > Is antything wrong with the conversion procedure from hgt to tif I used. > Especially the message "Using internal nodata values (eg. -32768) for image > ..." indicates some problems to me. > > I have no experience with geo transformations and the software used for it. I > just apply recipes from others. > > Software: opensuse 12.3 > > QLandkarteGT-1.6.0-3.1.x86_64 > libgdal1-1.9.2-5.7.x86_64 > gdal-1.9.2-5.7.x86_64 > libproj0-4.8.0-22.4.x86_64 > libprojectM2-2.1.0-4.1.1.x86_64 > > Any ideas > > Thanks for Help > Joachim > > > ------------------------------------------------------------------------------ > Own the Future-Intel® Level Up Game Demo Contest 2013 > Rise to greatness in Intel's independent game demo contest. > Compete for recognition, cash, and the chance to get your game > on Steam. $5K grand prize plus 10 genre and skill prizes. > Submit your demo by 6/6/13. http://p.sf.net/sfu/intel_levelupd2d > _______________________________________________ > Qlandkartegt-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users > ------------------------------------------------------------------------------ Own the Future-Intel(R) Level Up Game Demo Contest 2013 Rise to greatness in Intel's independent game demo contest. Compete for recognition, cash, and the chance to get your game on Steam. $5K grand prize plus 10 genre and skill prizes. Submit your demo by 6/6/13. http://altfarm.mediaplex.com/ad/ck/12124-176961-30367-2 _______________________________________________ Qlandkartegt-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users
