Hi Joachim, I tried those tiles from Greenland:
http://www.viewfinderpanoramas.org/dem3/GL-35000ers.zip I used: gdalwarp N69W030.hgt N68W029.hgt N68W030.hgt N69W029.hgt N68W031.hgt N69W031.hgt greenland.tif to stitch the tiles together. And gdalwarp -t_srs "+proj=merc +datum=WGS84" greenland.tif greenland_merc.tif to make it a plain Mercator Projection. HTH Oliver > Gesendet: Sonntag, 09. Juni 2013 um 15:44 Uhr > Von: "Joachim Ullrich" <[email protected]> > An: [email protected] > Betreff: [Qlandkartegt-users] projection for northern areas > > Hello, > > I want to use DEM data from http://www.viewfinderpanoramas.org for northern > scandinavia. The conversion from hgt files to tif files with srtmconvert.py > works fine if I use the following projection settings: > +proj=longlat +ellps=WGS84 +towgs84=0,0,0,0,0,0,0 +no_defs > > The downside is, that adding the resulting srtm.tif as DEM changes the > appearance of the map in qlandkartegt. The map is compressed in the vertical > (south-north) direction. > I assume a different projection setting in srtmconvert.py would fix that > problem. To me geoprojections are a dark art. So could somebody give me a > hint, what proj.4 settings would be appropriate? > > All proj=merc or proj=tmerc settings I tried resulted in geotiff data which > had no georeference. Only proj=longlat produced a result with geo coordinates. > > Thanks for help > Joachim > > ------------------------------------------------------------------------------ > How ServiceNow helps IT people transform IT departments: > 1. A cloud service to automate IT design, transition and operations > 2. Dashboards that offer high-level views of enterprise services > 3. A single system of record for all IT processes > http://p.sf.net/sfu/servicenow-d2d-j_______________________________________________ > Qlandkartegt-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users > ------------------------------------------------------------------------------ How ServiceNow helps IT people transform IT departments: 1. A cloud service to automate IT design, transition and operations 2. Dashboards that offer high-level views of enterprise services 3. A single system of record for all IT processes http://p.sf.net/sfu/servicenow-d2d-j _______________________________________________ Qlandkartegt-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users
