Dear Tom, thanks for your clear explanation. I think I should obtain better results by this procedure: 1) Building vector contours from dem 90 meters; 2) Conversion contours to raster 3) Running r.surf.rst in order to generate a new dem with higher resolution
can it be a good way? Thanks Regards Edmondo 2009/1/20, Tom van der Putte <[email protected]>: > > Hi Edmondo, > > > > If I get your question correctly: > > Resampling data with a spatial resolution of 90m might increase the > resolution of the DEM itself , but it will not increase the detail of the > data, only the number of pixels in your DEM. For instance, when you > downscale an image of 1 x 1 pixel by a factor 2 (both in x and y direction), > the new image will consist of four pixels (2x2). Which all have the same > value as the original 1 pixel. So although the number of pixels has been > increased, the detail remains the same. > > > > So in the end there is not much to do about it. > > > > Regards, Tom > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Edmondo Elisei > *Sent:* dinsdag 20 januari 2009 9:50 > *To:* GRASS user list > *Subject:* [GRASS-user] Draping map > > > > Hi, > I've a DEM with 90m resolution and a tif map (1 m res). > > In draping the tif on my dem the resultant map in nviz has a very low > quality. > I tried changing the resolution of the DEM (r.resamp) in order to have the > same than tif, but I didn't obtain improvements. > > Any advice? > > Thanks > > regards > > Geen virus gevonden in het binnenkomende-bericht. > Gecontroleerd door AVG - http://www.avg.com > Versie: 8.0.176 / Virusdatabase: 270.10.9/1902 - datum van uitgifte: > 19-1-2009 20:52 >
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