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Singlepart to multipart
2 messages · Jonathan Greenberg, Roger Bivand
On Tue, 29 Oct 2013, Jonathan Greenberg wrote:
R-sig-geo'ers: If I have a SpatialPolygonsDataFrame with a field "MYID", how do I go about coercing that object to a multipart polygon, where I am "merging" on the MYID field?
maptools::unionSpatialPolygons() which calls rgeos::gUnaryUnion, so go to rgeos::gUnaryUnion first unless you have challenged geometries - if hole problems use maptools::checkPolygonsHoles first. Hope this helps, Roger
--j
Roger Bivand Department of Economics, NHH Norwegian School of Economics, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 e-mail: Roger.Bivand at nhh.no