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<p>Dear Tom,<br>thanks for your clear explanation.</p>
<p>I think I should obtain better results by this procedure:<br>1) Building vector contours from dem 90 meters;<br>2) Conversion contours to raster<br>3) Running r.surf.rst in order to generate a new dem with higher resolution</p>
<p>can it be a good way?<br>Thanks<br>Regards</p>
<p>Edmondo</p></div>
<div><span class="gmail_quote">2009/1/20, Tom van der Putte <<a href="mailto:tom@vdputte.nl">tom@vdputte.nl</a>>:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
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<p><span style="FONT-SIZE: 11pt; COLOR: #1f497d">Hi Edmondo,</span></p>
<p><span style="FONT-SIZE: 11pt; COLOR: #1f497d"> </span></p>
<p><span lang="EN-US" style="FONT-SIZE: 11pt; COLOR: #1f497d">If I get your question correctly:</span></p>
<p><span lang="EN-US" style="FONT-SIZE: 11pt; COLOR: #1f497d">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.</span></p>
<p><span lang="EN-US" style="FONT-SIZE: 11pt; COLOR: #1f497d"> </span></p>
<p><span lang="EN-US" style="FONT-SIZE: 11pt; COLOR: #1f497d">So in the end there is not much to do about it. </span></p>
<p><span lang="EN-US" style="FONT-SIZE: 11pt; COLOR: #1f497d"> </span></p>
<p><span lang="EN-US" style="FONT-SIZE: 11pt; COLOR: #1f497d">Regards, Tom</span></p>
<p><a name="11ef34af4a665cc4__MailEndCompose"><span lang="EN-US" style="FONT-SIZE: 11pt; COLOR: #1f497d"> </span></a></p>
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<p><b><span lang="EN-US" style="FONT-SIZE: 10pt">From:</span></b><span lang="EN-US" style="FONT-SIZE: 10pt"> <a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:grass-user-bounces@lists.osgeo.org" target="_blank">grass-user-bounces@lists.osgeo.org</a> [mailto:<a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:grass-user-bounces@lists.osgeo.org" target="_blank">grass-user-bounces@lists.osgeo.org</a>] <b>On Behalf Of </b>Edmondo Elisei<br>
<b>Sent:</b> dinsdag 20 januari 2009 9:50<br><b>To:</b> GRASS user list<br><b>Subject:</b> [GRASS-user] Draping map</span></p></div>
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<p> </p>
<p>Hi,<br>I've a DEM with 90m resolution and a tif map (1 m res).</p>
<p>In draping the tif on my dem the resultant map in nviz has a very low quality.<br>I tried changing the resolution of the DEM (r.resamp) in order to have the same than tif, but I didn't obtain improvements.</p>
<p>Any advice?</p>
<p>Thanks</p>
<p>regards</p></span></div>
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