[GRASS-user] Draping map

[Edmondo Elisei]

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 <tom a vdputte.nl>:
>
>  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:* grass-user-bounces a lists.osgeo.org [mailto:
> grass-user-bounces a lists.osgeo.org] *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
>
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> 19-1-2009 20:52
>
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