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<p class="MsoPlainText"><span lang="DA">Hi,<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="DA"><o:p> </o:p></span></p>
<p class="MsoPlainText">Having a problem dissolving two large multi polygons – one of my students asked why I suggest ‘dissolve’ – when ‘merge selected features’ was so much faster. Dissolve takes ages.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">After consulting a master on this issue (Nyall <span style="font-family:Wingdings">
J</span>) he suggested that I change the settings -> Options -> Digitizing -> and change "Validate geometries" from QGIS to "GEOS".
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Now the dissolve runs smooth and fast<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I don´t have a clue about this topic – But my question is: Why is this not standard ?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Regards<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA"><o:p> </o:p></span></p>
<p class="MsoNormal" style="line-height:8.0pt"><b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">Lene Fischer<o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA">Associate Professor</span><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:black;mso-fareast-language:DA"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA"><o:p> </o:p></span></p>
<p class="MsoNormal" style="line-height:8.0pt"><b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">University of Copenhagen<o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA">Department of Geoscience and Natural Resource Management<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA">Forest and Landscape College<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA">Nødebovej 77a<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA">3480 Fredensborg<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA">Denmark<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA"><o:p> </o:p></span></p>
<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA">MOB +45 004540115084<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA"><a href="mailto:lfi@ign.ku.dk" title="lfi@ign.ku.dk"><u><span lang="DA" style="color:gray;text-decoration:none">lfi@ign.ku.dk</span></u></a><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA"><o:p> </o:p></span></p>
<p class="MsoNormal" style="line-height:12.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:EN-GB"><img border="0" width="320" height="122" id="Billede_x0020_2" src="cid:image001.gif@01D1F2C9.B37C4870">
</span><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="line-height:8.0pt"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray;mso-fareast-language:DA"><o:p> </o:p></span></p>
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