<html>
<head>
<style><!--
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
font-size: 10pt;
font-family:Tahoma
}
--></style>
</head>
<body class='hmmessage'><div dir='ltr'>
<br> <BR> <BR>Hi Sylvain<BR> <BR>Great that you can deal with the anomalies in Grass.<BR>I hope that the note 'Undoubtedly the linear artifact are « step anomaly » (p. 19 text).' That should make the correction straightforward. <BR>I figured that by ink-stain they would imply some anomalous 'edge' like when a coffee-stains darkens at the edges. In any circumstance, you've got the upper hand on it now. .. and I've become fameous ;o)<BR> <BR>Carsten<BR><div><div id="SkyDrivePlaceholder"> </div><div>> Hi Carsten,<br>> <br>> Continuing your idea I import ASTER QA Plain file ASTGTM_..._num.tiff<br>> in my GRASS location. It show a 1 to 3 stack count which borders areas<br>> superpose with artifacts (see both images end of<br>> http://yepca.org/wp3/?p=303 ).<br>> Next steep is to verify what append if I use the stack number to<br>> correct GDEM using GRASS mapcalc (something like 'if stack layer = 3<br>> than GDEM =+20m'). Then comparing with SRTM-DEM in a untouched forest<br>> area... Let me dream...<br>> <br>> Thanks again<br>> Sylvain<br></div></div><div> </div> </div></body>
</html>