On 10/16/15 08:56, Oliver Eichler wrote: > Hi Flo > > hill shading and slope colouring are derived from the DEM data by QMS. > Contour lines are not done. >
Ok, good to know. So it's not a matter of the DEM source I use. > > If someone is interested have a look into: > > void CDemVRT::draw(IDrawContext::buffer_t& buf) > > > The code reads the DEM data in small chunks of data (tiles). The data is > used to derive a pixmap tile to be displayed. Usually a tile is 64x64 > points. The data read is 66x66 points. That is important to derive the > points at the borders correctly. So the task is to derive contour lines > for those tiles. > Thank you for this explaination. I am not sure if I will take the time to look into that in the near future ... Thanks. Flo. > Am 16.10.2015 um 00:49 schrieb Flo: >> >> On 10/13/15 15:00, Oliver Eichler wrote: >>> Hi Flo, >>> >>> I never missed that feature at all as my topographic maps have those >>> lines included. Ages ago there where transparent Garmin files with >>> elevation lines to be used as overlay on the devices. This will work >>> with QMS, too. But usually these lines are of bad quality. The used >>> algorithms fail miserably at steep slopes. >>> >>> I never tried to add vectorial maps to a *vrt. I would expect them to >>> fail. But I can't tell for sure. >>> >> The DEM data I am using are put together with a .vrt file. The single >> 'images' are .hgt files. >> >> Is the functionality of coloring slopes (corresponding to their >> steepness) included in these files or is this part of Qmapshack? >> >> Best Regards, >> Flo >> >>>> Hi, >>>> >>>> Right now I am using >>>> http://www.viewfinderpanoramas.org/Coverage%20map%20viewfinderpanoramas_org3.htm >>>> to download the DEM data from a specific region. If I mark the checkbox >>>> I can have the hillshade or steepness of the slopes be displayed on top >>>> of the underlying maps. >>>> >>>> Strange enough I haven't found anything like this for contour lines as >>>> this would be really useful. Maybe with adjustable colors to increase >>>> the contrast to the underlying map (or satellite images). >>>> >>>> Thanks for hints. >>>> >>>> Flo >>>> >>>> PS: At my research I found http://opendem.info . They provide zip files >>>> for most of the regions. Maybe those help. But when I want to build a >>>> vrt there is the error message: 'Unable to find field `location' in DBF >>>> file' (BTW: There is a .dbf, .prj, .shp and .shx). Any help on that? >>>> Thanks again. >>>> >>>> ------------------------------------------------------------------------------ >>>> _______________________________________________ >>>> Qlandkartegt-users mailing list >>>> [email protected] >>>> https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users >>> >>> ------------------------------------------------------------------------------ >>> _______________________________________________ >>> Qlandkartegt-users mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users >>> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> Qlandkartegt-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users > > ------------------------------------------------------------------------------ _______________________________________________ Qlandkartegt-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users
