<div dir="ltr"><div><div>Hi Tonino<br><br></div>I think this is related to how QGIS takes "null" values in this version: null values are taken as "minus infinite" (-inf), then perhaps it is also taken as "nan" (not a number).<br>
<br>Try to make your work with GRASS plugin. If you are not familiar with it, try to convert "nan" values into zero values. Try this expression with raster calculator:<br>(DEM<0)*0+(DEM>=0)<br><br>This expression converts values less than zero to 0. If you have layers with different extension, you must be aware about it en raster calc.<br>
<br>Good luck<br><br></div><div>Carlos Cerdán<br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-08-12 8:34 GMT-05:00 CONTI Tonino <span dir="ltr"><<a href="mailto:t.conti@comune.jesi.an.it" target="_blank">t.conti@comune.jesi.an.it</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#ffffff">
<div dir="ltr"><font color="#000000" face="Tahoma"><span><font size="3">Hi </font></span><span><font size="3">Luis</font></span><font size="3">
</font><span><font size="3">Miguel,</font></span><font size="3"> <br>
</font><span><font size="3">I tried to</font></span><font size="3"> </font>
<span><font size="3">reduce points</font></span><font size="3"> </font>
<span><font size="3">and lower the</font></span><font size="3"> </font>
<span><font size="3">resolution</font></span><font size="3"> </font><span><font size="3">without</font></span><font size="3">
</font><span><font size="3">resolve</font></span><span><font size="3">.</font></span><font size="3">
<br>
</font><span><font size="3">I thought then</font></span><font size="3">
</font><span><font size="3">that it was</font></span><font size="3"> </font>
<span><font size="3">a problem with the</font></span><font size="3"> </font>
<span><font size="3">type of data</font></span><font size="3"> </font>
<span><font size="3">contained in the field</font></span><font size="3">
</font><span><font size="3">that expresses</font></span><font size="3">
</font><span><font size="3">the elevation</font></span><span><font size="3">.</font></span><font size="3">
<br>
</font><span><font size="3">I</font></span><font size="3"> </font><span><font size="3">then</font></span><font size="3">
</font><span><font size="3">tried</font></span><font size="3"> </font>
<span><font size="3">to use a</font></span><font size="3"> </font><span><font size="3">number</font></span><font size="3">
</font><span><font size="3">of type double</font></span><font size="3">
</font><span><font size="3">with</font></span><font size="3"> </font>
<span><font size="3">an accuracy of one</font></span><font size="3"> </font>
<span><font size="3">decimal</font></span><font size="3"> </font><span><font size="3">but I have not</font></span><font size="3">
</font><span><font size="3">solved yet.</font></span></font></div>
<div dir="ltr"><font color="#000000" face="tahoma" size="3"><span></span></font> </div>
<div dir="ltr"><font color="#000000" face="Tahoma"><span>Tonino</span></font></div>
<div dir="ltr"><font color="#000000" face="tahoma"><span></span></font> </div>
<div dir="ltr"><font color="#000000" face="tahoma"><span></span></font> </div>
<div style="DIRECTION:ltr">
<hr>
<font color="#000000" face="Tahoma"><b>Da:</b> Luis Miguel Royo Pérez [<a href="mailto:luis.miguel.royo@gmail.com" target="_blank">luis.miguel.royo@gmail.com</a>]<br>
<b>Inviato:</b> martedì 12 agosto 2014 11.18<br>
<b>A:</b> <a href="mailto:qgis-user@lists.osgeo.org" target="_blank">qgis-user@lists.osgeo.org</a><br>
<b>Oggetto:</b> Re: [Qgis-user] spatial interpolation by a shape file of points<br>
</font><br>
</div><div><div class="h5">
<div></div>
<div>Hello,<br>
maybe I'm wrong, but when I have that message in any software is something related with RAM. Maybe the raster file created is very large, try to make one with low resolution.<br>
<br>
Best wishes.<br>
<br>
<div>El 12/08/14 a las #4, CONTI Tonino escribió:<br>
</div>
<blockquote type="cite"><font color="#000000" face="Tahoma"><font color="#000000" face="Tahoma"><span><font size="3">ing a</font></span><font size="3">
</font><span><font size="3">dem</font></span><font size="3"> </font><span><font size="3">from</font></span><font size="3">
</font><span><font size="3">a point file</font></span><font size="3">
</font><span><font size="3">format</font></span><font size="3"> </font>
<span><font size="3">in</font></span><font size="3"> </font><span><font size="3">shape.</font></span><font size="3">
<br>
</font><span><font size="3">The</font></span><font size="3"> </font><span><font size="3">raster</font></span><font size="3">
</font><span><font size="3">is not shown</font></span><font size="3">
</font><span><font size="3">but</font></span><font size="3"> </font><span><font size="3">qgis</font></span><font size="3">
</font><span><font size="3">returns the message</font></span><font size="3">
</font><span><font size="3">"bad</font></span><font size="3"> </font>
<span><font size="3">allocation"</font></span><font size="3"> </font>
<span><font size="3">and</font></span><font size="3"> </font><span><font size="3">the</font></span><font size="3">
</font><span><font size="3">legend</font></span><font size="3"> </font>
<span><font size="3">shows</font></span><font size="3"> </font><span><font size="3">"nan</font></span><span><font size="3">"</font></span><span><font size="3">.</font></span></font></font></blockquote>
<br>
<div>-- <br>
<img src="cid:part1.05060103.04070300@gmail.com" border="0"></div>
</div>
</div></div></div>
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