Hi Gerd Perhaps I'm too fussy differating between values per se and string values
Anyway, the --dem-interpolation seems a very good idea with a chance to add more types of interpolation when available.
Nick On 24/01/2018 15:57, Gerd Petermann wrote:
Hi Nick, is that so? I'll change it to --dem-interpolation=auto|bicubic|bilinear Gerd ________________________________________ Von: mkgmap-dev <[email protected]> im Auftrag von osm@pinns <[email protected]> Gesendet: Mittwoch, 24. Januar 2018 16:52 An: [email protected] Betreff: Re: [mkgmap-dev] DEM: performance with bicubic interpolation Hi Gerd I'm a bit confused when you mentioned value as that seems to imply a number? Just to clarify : the options are: --dem-interpolation=auto or bilateral or bicubic ? Nick On 24/01/2018 15:10, Gerd Petermann wrote: Hi all, I like Andrzejs suggestion and created a patch that implements and documents the option like this: --dem-interpolation=value Use this option to speciy the method that is used to interpolate data from hgt raster to the DEM raster. The value bicubic gives the highest precision but is slower, bilinear is faster but less precise, it tends to smooth the profile and thus also reduces DEM size compared to bicubic. The value auto means that bicubic is used where is seems appropriate according to hgt resolution and dem-dist value, else bilinear is used. If not given, the default is auto. Please suggest improvements, else I'll commit that tomorrow. Gerd ________________________________________ Von: mkgmap-dev <[email protected]><mailto:[email protected]> im Auftrag von Andrzej Popowski <[email protected]><mailto:[email protected]> Gesendet: Mittwoch, 24. Januar 2018 14:57 An: [email protected]<mailto:[email protected]> Betreff: Re: [mkgmap-dev] DEM: performance with bicubic interpolation Hi Gerd, maybe someone will add more input to this discussion, but for me now following solution make sens: provide option dem-interplation with 3 values: - bilinear - fast interpolation for all layers, - bicubic - precise interpolation for all layers, - auto - default settings - automatically switching between bilinear and bicubic, depending on DEM and HGT resolution. -- Best regards Andrzej _______________________________________________ mkgmap-dev mailing list [email protected]<mailto:[email protected]> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev _______________________________________________ mkgmap-dev mailing list [email protected]<mailto:[email protected]> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev _______________________________________________ mkgmap-dev mailing list [email protected] http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
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