<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.E-MailFormatvorlage17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 2.0cm 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="DE" link="#0563C1" vlink="#954F72">
<div class="WordSection1">
<p class="MsoNormal">Hi!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I'm trying to aggregate neighboring polygons based on additional conditions. These are:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">- the polygons must be adjacent<o:p></o:p></p>
<p class="MsoNormal">- the polygons must be of the same type (simple value from attribute)<o:p></o:p></p>
<p class="MsoNormal">- the polygons should only be combined if the values of an attribute x are below a certain value AND
<o:p></o:p></p>
<p class="MsoNormal">- the polygons shall be merged with other polygons until this value is reached<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The polygons are grids. Aggregation should not necessarily lead to new squares (as in the Quadtree-method).
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I use PostGIS to store the data and QGIS for visualization and further processing. For performance reasons I suspect that a database-supported procession makes sense, but if QGIS (GDAL,GRASS etc.) offers a function, I would like to try
it out.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I would be happy about support<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards<o:p></o:p></p>
<p class="MsoNormal">Sven<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">----------------------------<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:DE">empirica ag<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:DE">Sven Böhme<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:DE">Kaiserstraße 29<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:DE">53113 Bonn<br>
Fon +49 (0)228 91489-90<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:DE">Fax +49 (0)3222 95 66 169<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:DE"><a href="http://www.empirica-institut.de/"><span style="color:blue">www.empirica-institut.de</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:DE"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-fareast-language:DE">empirica ag - Zweigniederlassung Bonn - HRB 87951 Amtsgericht Charlottenburg<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;color:black;mso-fareast-language:DE">Vorstand: Dr. Marie-Therese Krings-Heckemeier (Vorsitzende),</span><span style="font-size:12.0pt;color:black;mso-fareast-language:DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;color:black;mso-fareast-language:DE">Ludger Baba, Dr. Reiner Braun (stellv.
</span><span lang="EN-US" style="font-size:8.0pt;color:black;mso-fareast-language:DE">Vors.), Meike Heckenroth, Prof. Dr. Harald Simons</span><span lang="EN-US" style="font-size:12.0pt;color:black;mso-fareast-language:DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;color:black;mso-fareast-language:DE">Aufsichtsratsvorsitzender: Klaus Arndt</span><span style="font-size:12.0pt;color:black;mso-fareast-language:DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;color:black;mso-fareast-language:DE"> </span><span style="font-size:12.0pt;color:black;mso-fareast-language:DE"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:black;mso-fareast-language:DE">Kostenloser Newsletter von empirica. Jetzt anmelden:</span></b><span style="font-size:10.0pt;color:black;mso-fareast-language:DE">
</span><span style="font-size:12.0pt;color:black;mso-fareast-language:DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE"><a href="https://www.empirica-institut.de/newsletter-anmelden/"><span style="color:#0563C1">https://www.empirica-institut.de/newsletter-anmelden/</span></a></span><span style="font-size:10.0pt;color:black;mso-fareast-language:DE"><br>
Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren
sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet. - This e-mail may contain confidential and/or privileged information.
</span><span lang="EN-GB" style="font-size:10.0pt;color:black;mso-fareast-language:DE">If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure
or distribution of the material in this e-mail is strictly forbidden.</span><span lang="EN-US" style="font-size:12.0pt;color:black;mso-fareast-language:DE"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>