<html dir="ltr">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<style>
<!--
@font-face
{font-family:"Cambria Math"}
@font-face
{font-family:Calibri}
@font-face
{font-family:Tahoma}
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif"}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{margin:0cm;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif"}
span.EstiloCorreo17
{font-family:"Calibri","sans-serif";
color:windowtext}
span.TextodegloboCar
{font-family:"Tahoma","sans-serif"}
@page WordSection1
{margin:70.85pt 3.0cm 70.85pt 3.0cm}
-->
</style><style type="text/css" id="owaParaStyle"></style>
</head>
<body lang="ES" link="blue" vlink="purple" fpstyle="1" ocsi="0">
<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi <span class="Apple-style-span" style="font-family: Arial, sans-serif; ">Jesús,</span>
<div><font class="Apple-style-span" face="Arial, sans-serif">Check out maptools::unionSpatialPolygons. This function takes a spatial polygons object and aggregates polygons according to a vector ID which tell the function what input polygons belong to which
output polygons, in your case the province IDs.</font></div>
<div><font class="Apple-style-span" face="Arial, sans-serif"><br>
</font></div>
<div><font class="Apple-style-span" face="Arial, sans-serif">Note you may need to set gpclibPermit() to allow use of the gpclib package if rgeos is not available on your system.</font></div>
<div><font class="Apple-style-span" face="Arial, sans-serif"><br>
</font></div>
<div><font class="Apple-style-span" face="Arial, sans-serif">HTH,</font></div>
<div><font class="Apple-style-span" face="Arial, sans-serif"><br>
</font></div>
<div><font class="Apple-style-span" face="Arial, sans-serif">Simon<br>
</font>
<div><br>
<div class="BodyFragment"><font size="2">
<div class="PlainText"><br>
--------------------------------<br>
Simon O'Hanlon, BSc MSc<br>
Department of Infectious Disease Epidemiology<br>
Imperial College London<br>
St. Mary's Hospital<br>
London<br>
W2 1PG</div>
</font></div>
</div>
<div style="font-family: Times New Roman; color: #000000; font-size: 16px">
<hr tabindex="-1">
<div id="divRpF575618" style="direction: ltr; "><font face="Tahoma" size="2" color="#000000"><b>From:</b> r-sig-geo-bounces@r-project.org [r-sig-geo-bounces@r-project.org] on behalf of Alonso Nanclares, Jesús Alberto [jaalonson@indra.es]<br>
<b>Sent:</b> 14 June 2012 08:45<br>
<b>To:</b> r-sig-geo@r-project.org<br>
<b>Subject:</b> [R-sig-Geo] Combining polygons from a SpatialPolygonsDataFrame object<br>
</font><br>
</div>
<div></div>
<div>
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US">Dear list,</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">I have a Shapefile representing the censal sections of Spain, and my interest is creating a KML file with only 52 polygons representing the different provinces of Spain. I shall use readOGR, and my problem comes when
I have a SpatialPolygonsDataFrame object in R and I want to merge in only one polygon all the censal sections of every province. I have an attribute with the province ID defined in the same object, so it would only be aggregating the censal sections with the
same province ID, but still I don’t know how to do it.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">I shall be grateful for any help. My kind regards,</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black">Jesús Alberto Alonso Nanclares</span></b><br>
<span style="font-size:7.5pt; font-family:"Arial","sans-serif"; color:#999999">Consultor Junior</span><br>
<span style="font-size:7.5pt; font-family:"Arial","sans-serif"; color:black">Centro de Competencias Business Analytics<br>
<br>
Avda de Bruselas, 35<br>
28108 Alcobendas (Madrid)<br>
España<br>
<br>
T +34 914 805 863<br>
jaalonson@indra.es<br>
<a href="http://www.indracompany.com" target="_blank"><span style="color:blue">www.indracompany.com</span></a><br>
<br>
<img id="Imagen_x0020_1" src="cid:image001.jpg@01CD4A11.AD8A3DB0" alt="indra" height="36" width="103" border="0"></span></p>
<p class="MsoNormal"> </p>
</div>
<br>
<hr>
<font face="Arial" color="Gray" size="1">Este correo electrónico y, en su caso, cualquier fichero anexo al mismo, contiene información de carácter confidencial exclusivamente dirigida a su destinatario o destinatarios. Si no es vd. el destinatario indicado,
queda notificado que la lectura, utilización, divulgación y/o copia sin autorización está prohibida en virtud de la legislación vigente. En el caso de haber recibido este correo electrónico por error, se ruega notificar inmediatamente esta circunstancia mediante
reenvío a la dirección electrónica del remitente.<br>
Evite imprimir este mensaje si no es estrictamente necesario.<br>
<br>
This email and any file attached to it (when applicable) contain(s) confidential information that is exclusively addressed to its recipient(s). If you are not the indicated recipient, you are informed that reading, using, disseminating and/or copying it without
authorisation is forbidden in accordance with the legislation in effect. If you have received this email by mistake, please immediately notify the sender of the situation by resending it to their email address.<br>
Avoid printing this message if it is not absolutely necessary.<br>
</font></div>
</div>
</div>
</div>
</body>
</html>