[R-sig-Geo] Extract part(s) of SpatialPolygonsDataFrame

sylvain willart sylvain.willart at gmail.com
Thu May 13 13:13:52 CEST 2010


Hello,

I have an .RData file which is a SpatialPolygonsDataFrame a France,

I only need, for now, to work on two areas: Burgundy and Centre,

I would like to extract those two areas from the France file,

I tried, naïvely,
Centre <- France[France$NAME_1=="Centre", ]

but it didn't work out,
(NAME_1 is the variable where are stored the names of the French Regions)

any idea ?

Sylvain
PS: I found quite a lot of information on points, ploygons, or lines,
but few on spatialpolygonsdataframe besides they are "a set of spatial
polygons", Any reference on their inside structure ?



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