<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Hi Hernan,<br>
<br>
I think neither of the methods you used give good results for
interpolating terrain data (or most other interpolations).<br>
<br>
I had good results with v.surf.rst (available in the Processing
toolbox in the GRASS section). There are tons of options with the
v.surf.rst - but the defaults probably work for most options. You
also don't have to output all the raster results - just the
interpolated surface.<br>
<br>
One of the other options is the "Interpolation plugin" which comes
with QGIS (but you have to enable it in QGIS). It appears in the
raster menu in as "Interpolation". It offers a TIN interpolation and
IDW. I think the TIN method is the more interesting one.<br>
<br>
Hope this helps,<br>
Andreas<br>
<br>
<div class="moz-cite-prefix">On 17.10.2015 00:21, hersala wrote:<br>
</div>
<blockquote
cite="mid:CA+0GtdsggsVWPqmeT-4vfiJUyUyZXiV4cNUZ=5dsE30sDFeLoQ@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>Hello,<br>
</div>
<div><br>
</div>
<div>I'm working with a bundle of N-S and E-W distributed DGPS
point transects on gentle glacier slope. With these points I
created a shp file and then I obtained several DEMs (.tif
files) using the tool Raster/Analysis/Grid (Interpolation).</div>
<div>I've used Nearest Neighbor, Runing Means and Inverse
Distance with several argument values. Inverse Distance
produces the best results, but there are some artifacts that
persists and makes the output unusable. They give the
impression as if the glacial slope has bumps, but on the
contrary, it is quite gentle.</div>
<div><br>
</div>
<div>Can anyone give any advice in how to proceed to reduce such
artifacts.</div>
<div><br>
</div>
<div>I'm using QGIS 2.8.2-Wien in MS-Windows.</div>
<div><br>
</div>
<div>Thanks in advance.</div>
<div><br>
</div>
<div>Hernan</div>
<div><br>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Qgis-user mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Qgis-user@lists.osgeo.org">Qgis-user@lists.osgeo.org</a>
<a class="moz-txt-link-freetext" href="http://lists.osgeo.org/mailman/listinfo/qgis-user">http://lists.osgeo.org/mailman/listinfo/qgis-user</a></pre>
</blockquote>
<br>
</body>
</html>