s='fl'>1</span>)
<span class='no'>aggzones</span> <span class='kw'>&lt;-</span> <span class='kw pkg'>rgeos</span><span class='kw ns'>::</span><span class='fu'><a href='http://www.rdocumentation.org/packages/rgeos/topics/topo-bin-gUnion'>gUnaryUnion</a></span>(<span class='no'>zones</span>, <span class='kw'>id</span> <span class='kw'>=</span> <span class='no'>zones</span>@<span class='kw'>data</span>$<span class='no'>quadrant</span>)
<span class='no'>aggzones</span> <span class='kw'>&lt;-</span> <span class=