rdocumentation.org/packages/sf/topics/st_crs'>st_crs</a></span>(<span class='no'>zones_sf</span>))
<span class='no'>od_agg</span> <span class='kw'>&lt;-</span> <span class='fu'>od_aggregate</span>(<span class='no'>flow</span>, <span class='no'>zones_sf</span>, <span class='no'>aggzones_sf</span>)</div><div class='output co'>#&gt; <span class='warning'>Warning: st_centroid assumes attributes are constant over geometries of x</span></div><div class='output co'>#&gt; <span class='warning'>Warning: st_centroid 