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
