R_Extracting coordinates from SpatialPolygonsDataFrame

Question

Is it only me who have the problem with extracting coordinates of a polygon from SpatialPolygonsDataFrame object? I am able to extract other slots of the object

Answer 1

This took me a while to figure out too. The following function I wrote worked for me. sp.df should be SpatialPolygonsDataFrame.

extractCoords <- function(sp.df)
{
    results <- list()
    for(i in 1:length(sp.df@polygons[[1]]@Polygons))
    {
        results[[i]] <- sp.df@polygons[[1]]@Polygons[[i]]@coords
    }
    results <- Reduce(rbind, results)
    results
}